Gate 3: Nerf Gun Analysis

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Contents

Project Management: Coordination Review

Our group attempted to correct our issues with time management by assigning work on an individual basis. We then took the work edited it as a group and added it to the wiki. Although this method proved to save time and keep each member on task, the wiki had less flow or in other words a concise tone and quality. This showed through in the grading of the Product archeology in gate 2. Our group spent little time on the formatting of the information and focused more on the content. We are correcting for this by utilizing more tables and bullet points in gate 3. Our meeting schedule which we corrected last time and made more consistent has been working well and allowing all members of the group to finish their parts of the project on time. We as a group decided that finishing the gate before the due date and then going to office hour to get suggestions on how to refine the project would be most beneficial. Our conflict resolution plan to default to the project manager has been working well. Recently there was a conflict for one of the meetings due to prior obligations. The project manager decided going forward with the meeting one man down would be better than rescheduling due to the time constraints. We feel more confident in our ability as a group to address the four factors after we recently went over them in class. We corrected our misconceptions on what presentation style was required for the gates by talking to the instructors and changing the layout of our gates on the wiki. Rather than writing technical analysis in paragraph form, we will be utilizing tables we recently learned to make in the wiki. Our communication as a group has improved due to our recent corrective decision to utilize phone calls rather than texting. It seems that when we talk on the phone rather than text, information comes across clearly and we become more reliable to complete an assignment and get back to the group with the results. It seems that it was easier for group members to procrastinate while communicating through texting but found it hard to do so when they were required to directly speak to other members of the group and tell them why they did not finish their work.

Component Summary

Table 1: Nerf Speedload 6

Component Picture Function Material Manufacturing Process Times Used
Case
Nerf Speed Load 6
Figure 1: Case
The main function of the case is to hold everything together and give aesthetics for the product. ABS polymer plastic Injection Molding and Machining 2 (1 per side)
Trigger
Nerf Speed Load 6
Figure 2: Trigger
Takes user signal and energy and outputs this signal to the firing mechanism in order to release the spring. ABS Polymer plastic Injection Molding 1
Spring Guide
Nerf Speed Load 6
Figure 3: Spring Guide
Maintain the spring parallel to the rest of the pneumatic tube while energy is being stored in the spring ABS polymer plastic Injection Molding 1
Main Spring
Nerf Speed Load 6
Figure 4: Main spring
Translate the spring energy to the pneumatic tube. Spring Steel Coiling 1
Pneumatic Tube
Nerf Speed Load 6
Figure 5: Pneumatic Tube
Chamber air to create pressure to fire dart. ABS polymer plastic Injection Molding 1
Dart Chamber
Nerf Speed Load 6
Figure 6: Dart Chamber
Slide it back and the dart will be chambered. When dart is in chamber pneumatic tube pushes air through this part to export the dart. ABS polymer plastic Injection Molding and Machining 1
Cocking Mechanism
Nerf Speed Load 6
Figure 7: Cocking Mechanism
Connects to the Dart Chamber and translates the human input to the internal chamber. ABS polymer plastic Injection Molding and Machining 2 (1 per side)
Internal Magazine Track
Nerf Speed Load 6
Figure 8: Internal Magazine Track
Slides the darts up to the chamber so they can be loaded when cocking mechanism is pulled back. ABS polymer plastic and spring steel Injection Molding and Coiling 1

Table 2: Nerf Vortex Vigilon

Component Picture Function Material Manufacturing Process Times Used
Case
Nerf Speed Load 6
Figure 9: Case
The main function of the case is to hold everything together and give aesthetics for the product. ABS polymer plastic Injection Molding and Machining 2 (1 per side)
Trigger
Nerf Speed Load 6
Figure 10: trigger
Takes user signal and energy and outputs this signal to the firing mechanism in order to release the spring. ABS polymer plastic Injection Molding 1
Loading Spring
Nerf Speed Load 6
Figure 11: loading spring
Load the discs up towards the chamber of the gun. Spring Steel Coiling 1
Ammo Holder
Nerf Speed Load 6
Figure 12: Ammo Holder
Have the discs stay in a concentrated place so that the spring can push them up towards the chamber so they can be loaded. ABS polymer plastic Injection Molding and Machining 1
Cocking Mechanism
Nerf Speed Load 6
Figure 13: Cocking Mechanism
Connects to the Dart Chamber and translates the human input to the internal chamber. ABS polymer plastic Injection Molding and Machining 2 (1 per side)
Disc Chamber
Nerf Speed Load 6
Figure 14: Disc Chamber
Attached to the spring and moves in sync with it so the disc can be guided to the muzzle. ABS polymer plastic Injection Molding 1
Firing Spring
Nerf Speed Load 6
Figure 15: Firing Spring
Locks when cocked back and and when released moves the disc through the chamber. ABS polymer plastic and spring steel Injection Molding, Coiling and Machining 1
Circular Arm
Nerf Speed Load 6
Figure 17: Circular Arm
Applies a small frictional force to cause the disk to spin. ABS polymer plastic Injection Molding 1

Product Analysis:Nerf Speed Load 6

Component complexity scale:
Our component complexity scale that applies to the analysis of both guns which ranges from one to three. On our scale one is the least complex and three is the most complex.

1) The part is mostly flat and requires a relatively simple mold that has few raises or recesses. This level of complexity is defined for parts that serve small roles in the overall function of the gun. These components are connected to other components in a simple straight forward manner such as one pin or a small lever.
2)These components are three dimensional molded pieces that require a form with many recesses and raised pieces that may require extensive milling to make. These components are made to translate some sort of signal and can be intricately connected to other components. They require skilled manipulation in order to assemble them.
3) These components are of the greatest complexity and may require machining after the have been molded. The form in which they were molded has a great many of raises and recesses and may require more than a two form mold in order to be made. They interact with a multitude of other components and must translate signal and energy. These components have multiple parts and may require human manipulation for assembly.

Nerf Speed Load 6

Table 3: Case

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Case
  • Cavity for internal parts.
  • Also allows internal functions to have a base to operate on.
  • The case allows for user input.
  • The environment of usage is the area in which the product is being used by consumer.
  • Shaped like conventional pistol with extra fat barrel
  • Each side of case is very similar however few differences
  • It is 3D, 12in x 3in x 7in
  • The shape allows user to know where to aim and that it is not a real gun
  • 1 lbs
  • ABS polymer plastic
  • Injection molding is quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The aesthetic properties of this component are the only ones that appeal to the consumer. The case has to look like what the consumer wants because that is all that is seen.
  • The case is there to look like a fake gun and to appeal to the consumer.
  • The color is blue and yellow because it is flashy so there is visual appeal and to make it identifiable as a toy gun.
  • The surface finish of the outside is smooth for aesthetics and that of the inside is smooth but has multiple edges for internal components to be attached.
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • The shape is just a case so it can be molded easily with the specific edges and holes necessary.
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 1

Table 4:Trigger

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Trigger
  • Takes user signal and energy and outputs this signal to the firing mechanism in order to release the spring.
  • The trigger has the function of being a signal to fire and an energy transfer to release spring.
  • The signal and energy flows from human to trigger then the trigger is signal to fire and move slide to release spring.
  • The trigger acts partially inside the casing but also interaction with the user.
  • The trigger has a circular shape with a portion cut out for the finger. The connecting mechanism has a rod shape.
  • The elliptical holes in the trigger part and the top of the connecting rod.
  • both parts are 2D
  • Trigger- 1in X 1in, Rod- 2.5in X 1/8in.
  • The trigger's shape is meant to comfortable in the person hand for extended use. The rod makes it input signal more effectively.
  • 3 ounces
  • ABS polymer plastic
  • Injection molding is a quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The main aesthetic property of the trigger is the color that makes it stand out on the gun, the firing rod's main feature is its color as well
  • The trigger is a bright color so it's easily located the firing rod doesn't have an aesthetic purpose because it cannot be seen.
  • The trigger is a bright reddish-orange and the firing rod is navy blue.
  • Both parts have a smooth glossy finish. This is so that the parts can fit better and for the trigger specifically feel good on the users finger
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • The shape is a basic trigger and rod so it can be molded easily with the specific edges and holes necessary.
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 2

Table 5: Spring Guide

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Spring Guide
  • Maintain the spring parallel to the rest of the pneumatic tube while energy is being stored in the spring.
  • That is the only function that is done.
  • There is no flows involved with this part. It acts with the spring for the spring to maintain energy.
  • The end of the spring guide sticks out of the gun and the side inside the gun is inside casing acting with spring
  • Has a cylindrical shape
  • Has a general axis of symmetry
  • 3D part
  • 2.5 in long with an outer D = 1in and an inner D = 3/4in
  • The part is supposed to shaped so it can accommodate the spring
  • 10 ounces
  • ABS polymer plastic
  • Injection molding allows the part to be made quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The main aesthetic feature of the spring guide is its color. It isn't meant to stand out.
  • The purpose of the color is to make the gun seem smooth
  • The color of the part is navy blue. This part isn't a main part, the color makes it blend in with the rest of the gun
  • The internal part of this part has a smooth finish but the exposed part has a glossy finish. The glossy finish is to make it look better.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Th shape is cylindrical so it can be molded easily.
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 1

Table 6: Main Spring

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Main Spring
  • Translate the spring energy to the pneumatic tube.
  • The spring both stores energy and releases energy.
  • There are two flows involved with the spring. The storing of potential energy and the release of kinetic energy.
  • The spring is acting in correspondence with the spring guide and pneumatic tube inside the case.
  • This is a cylindrical spring
  • The spring coils are a notable property
  • 2D
  • 3in long with a diameter of 3/4in
  • The shape is everything for a spring. Without the cylindrical shape and the coils it doesn't function properly
  • 5 ounces
  • Metal, Steel
  • Coiling because the spring needs to be coiled to function properly.
  • Metal because it's strong enough to be stretched and go back to its normal position after being stretched
  • For the material of the spring metal was one of the only choices. Economically what metal was cheapest would be a major factor.
  • The main aesthetic feature of the spring is its shiny metallic look
  • The only purpose is so that it can be identified as a spring and not another part and it is the cheapest color
  • The spring has a metallic color because of that is a property of the metal used to make the spring
  • The finish is smooth so that the spring lasts a long time.
  • Coiling is used
  • The shape of the spring
  • The spring needs to be metal to function properly
  • The spring needs to have a cylindrical coiled shape to function properly
  • Economically Coiling is a cheap and easy way to mass produce springs. Environmentally there is almost no material waste.
  • 1

Table 7: Pneumatic Tube

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Pneumatic tube
  • Chamber air to create pressure to fire dart.
  • This is the only function of the tube.
  • The flow is the spring kinetic energy pushing the tube to create pneumatic energy to fire the dart
  • The tube is connected to the spring and to a part of the dart chamber inside of the case.
  • The general shape is a cylinder
  • It has a general axis of symmetry
  • 3D
  • 3in long with a diameter of 1 in
  • The tube needs to be a cylinder so it works with the dart, spring and chamber well since they all have the same shape.
  • 10 ounces
  • ABS polymer plastic
  • Injection molding is quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The main aesthetic property of the pneumatic tube is its color
  • The components aesthetic purpose is so that it can be identified as an internal plastic component and not something else
  • The color is bright orange so it can be identified as an internal component and it is the cheapest color
  • The surface finish is smooth so that it matches the finish of the other components and since it's hidden it doesn't need a high quality finish
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Th shape is cylindrical so it can be molded easily.
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 1

Table 8: Dart Chamber

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Dart Chamber
  • Slide it back and the dart will be chambered. When dart is in chamber pneumatic tube pushes air through this part to export the dart.
  • Main function is to hold the dart in chamber and second function is to load the dart into it.
  • There is a flow of pneumatic energy is pushed through to fire the dart.
  • The environment of the chamber is inside the case having an attachment to the cocking mechanism and pneumatic tube.
  • The general shape is a cylinder.
  • It has a general axis of symmetry besides the levers and the casing around the barrel
  • 3D
  • 5in long, Barrel- D=3/8in, Casing around Barrel- D=.5in
  • The cylindrical shape needs to be able to fit the dart inside and the end is wider than the barrel so it works with the spring well
  • 8 ounces
  • ABS polymer plastic
  • Injection molding allows the part to be made quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country
  • The main aesthetic property of the Dart Chamber is its color
  • The components aesthetic purpose is so that it can be identified as an internal plastic component and not something else
  • The color is bright orange so it can be identified as an internal component and it is the cheapest color
  • The surface finish is smooth so that it matches the finish of the other components and since it's hidden it doesn't need a high quality finish
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Th shape is cylindrical so it can be molded easily.
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 3

Table 9: Cocking Mechanism

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Cocking Mechanism
  • Slide back in order to load the dart.
  • Connects to the Dart Chamber and translates the human input to the internal chamber.
  • The flow of human energy to dart chamber to storing of potential in spring.
  • This part is located on the outside of the case but is connected to a pin inside the case to connect to dart chamber
  • The general shape is a rectangle with some parts cut out for ergonomics
  • It has a general axis of symmetry when whole and screw holes
  • 3D
  • 2.5in long X 1.5in tall X 1.5in deep (both halves as one part)
  • The shape allows for the person to be able to grip it easily and cock it back easily
  • 1 lb
  • ABS polymer plastic
  • Injection molding is quick and cheap
  • Plastic is lightweight and easily molded
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country.
  • The main aesthetic property of the cocking mechanism is its color
  • The aesthetic purpose is to make it stand out because it performs a main function to the gun
  • The color is yellow so that it stands out on the gun
  • The surface finish is glossy because the user is in contact with it a lot
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • The shape is very uniform so it can be molded easily and in a high volume
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products.
  • 1

Table 10: Internal Magazine Track

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Internal Magazine Track
  • Slides the darts up to the chamber so they can be loaded when cocking mechanism is pulled back.
  • The magazine holds the darts as well as moves them up to the chamber.
  • There is a spring force pushing the dart up but it is not involved with the actual firing of the dart.
  • The magazine is located under a part of the case but is interacted with consumer when loaded by them.
  • Rectangular box with a V shaped spring
  • The V-shaped spring with a small coil in the middle
  • 3D rectangle and 2D spring
  • Rectangle - 2in long X 1in tall X .5in deep, Spring - 2 in long X 1/4in tall (when scrunched up)
  • The shape is rectangular to match the width of the dart to push the darts up the the spring is V-shaped to push the rectangle up
  • 6 ounces
  • ABS polymer plastic, and Metal
  • Injection molding is quick and cheap, Coiling because the spring needs to be coiled
  • Plastic is lightweight and easily molded
  • Metal because it's strong enough to be stretched and go back to its normal position after being stretched
  • The main factor that effected the material is the economic factor. Plastic is a cheap and and easily molded material. Environmentally it uses less waste material and energy. A Societal factor the material had to feel different from a normal gun. Globally they couldn't have the gun look like a real gun due to crime and violence across the country. For the material of the spring metal was one of the only choices. Economically what metal was cheapest would be a major factor
  • The aesthetic property of the Internal Magazine Track is its color
  • The components aesthetic purpose is so that it can be identified as an internal plastic component and not something else
  • The color is bright orange so it can be identified as an internal component and it is the cheapest color
  • The surface finish is smooth so that it matches the finish of the other components and since it's hidden it doesn't need a high quality finish
  • Injection Molding and coiling
  • Riser marks are evident on the plastic so it must be injection molding. The spring needs to be coiled to work right
  • Plastic is used so molding is easy and cheap to use. The spring needs to be metal to function correctly.
  • The shape is rectangular so it can be molded easily. The spring needs to have its V-shape and the coil in the middle to function properly
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place there plant where they can get to petroleum by products. * Economically Coiling is a cheap and easy way to mass produce springs. Environmentally there is almost no material waste.
  • 2

Nerf Vortex Vigilon

Table 11: Case

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Case
  • Acts as the cavity in which the internal components are housed and secured.
  • The case give a base in which all of the other functions can take lace.
  • The only flow to the case is human signal to aim the gun.
  • Since the case acts as a holder for the internal components it operates everywhere the user takes it since it will continue to house the internal components.
  • The case has the general shape of a hand gun.
  • There is axial symmetry along the barrel of the gun to the handle from a top view except for minor details.
  • It is a three dimensional object approximately 12" in length 3" in width and 6" in height.
  • The component is shaped like a hand gun in order to be visually appealing and is ergonomic so the user can easily aim it.
  • The case weighs about 1 pound.
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen.
  • The specific material property the case must have is the ability to accept screws as fasteners for the internal components.
  • Global: Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal: A plastic gun is much less threatening than a metal one so ABS was used.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • The case serves as the main aesthetic attraction for the consumer. It imitates the look of a handgun while being bright colored and non threatening.
  • The case is red and green in order to be attractive to children and market it self as a toy and not a real firearm.
  • The component has a fine, smooth surface finish from the mold.
  • The finish is aesthetic to give the gun a sleek look.
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 1

Table 12: Trigger

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Trigger
  • The trigger takes user signal and energy and outputs this signal to the firing mechanism in order to release the spring.
  • The trigger has the function of being a signal to fire and an energy transfer to release spring.
  • The signal and energy flows from human to trigger then the trigger is signal to fire and to release the spring.
  • The trigger acts partially inside the casing but also interacts with the user.
  • The trigger has a circular shape with a portion cut out for the finger. The connecting mechanism has a rod shape.
  • The elliptical holes in the trigger part and the top of the connecting rod.
  • both parts are 2D
  • Trigger- 1in X 1in, Rod- 2.5in X 1/8in.
  • The trigger's shape is meant to comfortable in the person hand for extended use. The rod makes it input signal more effectively.
  • The trigger is 1oz
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen.
  • The specific material property the trigger has is it rigidity and ability to translate energy.
  • Global:Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal:The plastic that was used is widely used and is recognized to the touch. If a rubberized plastic was used then people may not take easily to the feel of it.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • The trigger is orange and is in the shape of a gun trigger to make its function obvious to the user.
  • The aesthetic purpose is to make the toy look more like a gun.
  • It is orange in order to attract the eye of the consumer.
  • Smooth surface finish.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 2

Table 13: Loading Spring

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Loading Spring
  • The loading spring stores energy and acts as the force to push the disc into the gun.
  • The spring act as a signal translator and also translates mass from the clip to the chamber.
  • It takes signal from the cocking mechanism and forces the disc into the chamber.
  • The spring acts in the casing inside the clip cavity.
  • The loading spring is cylindrical and is a helical wire .
  • It has two axises of symmetry and is mostly empty space.
  • It appears to be two dimensional.
  • It is 3in long by 1.5in in diameter.
  • The loading spring is 1oz
  • The loading spring is made from coiled steel.
  • The need to coil the material easily lead to the selection of metal.
  • The flexibility and ability for metal to remember its shape are necessary to store the energy need to chamber the discs.
  • Global:Since metal is a raw material that can be found in most countries it was selected to be coiled and used to chamber the discs.
  • Economic:Since steel is cheep they used it instead of some other possibly more expensive metal.
  • Societal:Since a metal spring is a common sight to most people another type of compression method would be less practical.
  • Environmental: Steel can be easily recycled and has few harmful effects on the environment as it corrodes.
  • The loading spring has no aesthetic properties.
  • Shiny silver because it is stainless steel to prevent corrosion.
  • Fine surface finish.
  • Finish is functional.
  • The part was drawn then curled.
  • The part has been curled because it has no tooling marks and the cost of production in any other way would be too expensive.
  • Metal as a material is much easier to curl or roll than composites that could also act as a spring.
  • Economically Coiling is a cheap and easy way to mass produce springs. Environmentally there is almost no material waste.
  • 1

Table 14: Ammo Holder

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Ammo Holder
  • The ammo holder acts as a holder and reservoir for the discs.
  • The holder acts as a reservoir and channel through which the loading spring acts.
  • The mass(discs) flow into it and out of it.
  • The ammo holder functions in the case.
  • The ammo holder is cylindrical with a rectangular extrusion.
  • It has symmetry in the cylindrical part but other wise nothing notable.
  • It is a three dimensional component.
  • It is 3in long by 3in high by 1.25in wide.
  • The components cylindrical shape allows the ammo to be stored and pass through it with ease which is its main function.
  • The ammo holder is 3oz
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen. Also the need for a fine surface finish that is required for the discs to move through the holder.
  • There is no specific material property needed for it to function except for structural rigidity.
  • Global: Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal: A plastic ammo holder is easier to interact with than a complex clip system that would be necessary for a heavier metal clip.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • The ammo holder is orange because that is the color of plastic used for most components and is used only for consistency.
  • No aesthetic purpose.
  • Fine finish for smooth travel of the discs through the holder.
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Injection Molding
  • Machining
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 2

Table 15: Circular Arm

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Circular Arm
  • The circular arm adds rotation to the disc when it is thrown from the gun.
  • The component only dissipates the springs energy by translating it to the disc rotation that is its only function.
  • Energy and signal are flow through the firing spring and to the arm through the moving disc.
  • The arm functions in the case
  • The circular arm is a small straight piece of plastic with a circular tip.
  • One axis of symmetry and a cicrular head.
  • It is primarily one dimensional
  • It is 1/2in lon by 1/16in wide by 1/16in thick.
  • The circular arm is 1/8oz
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen. Also the need for a fine surface finish that is required for the discs to interact with the circular head and not gain too much traction to the point where it may stop or slow the disc down significantly.
  • The small coefficient of friction is why plastic may have been chosen.
  • Global: Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal: A plastic piece is lighter than metal which make the gun as a product more acceptable to the public.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • The arm is orange plastic because that is the color of plastic used for most components and is used only for consistency.
  • No aesthetic purpose.
  • Smooth finish for low friction while rotating disc.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 1

Table 16: Disc Chamber

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Disc Chamber
  • The disc chamber houses the round before it is fired and also gives the disc a path to travel as it is fired.
  • The chamber not only houses the disc to be fired but it guides the projectile.
  • Energy and mass flow through the chamber.
  • The chamber functions in the case.
  • The disc chamber is a multi-part component that is in the shape of a rectangular box.
  • It has external axis symmetry but internally it has no symmetry and is a complex set of interactions.
  • It is three dimensional.
  • IT is 4.5in long by 2.5in wide by 1in thick.
  • Its shape allows the cocking mechanism to pull it along the barrel length to load the spring as it receives a round from below because it has opened up and allowed a cavity for the disc.
  • The disc chamber is 8oz
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen. Also the need for a fine surface finish that is required for the discs to smoothly move through the reservoir.
  • Other than rigidity no material property is required.
  • Global: Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal: A plastic piece is lighter than metal which make the gun as a product more acceptable to the public.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • It is orange plastic for consistency.
  • Fine finish for smooth movement back and forth.
  • No aesthetic purpose.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 3

Table 17: Cocking Mechanism

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Cocking Mechanism
  • The cocking mechanism is the component through which all of the energy is added to the gun.
  • The cocking mechanism helps chamber the round and store potential energy in the firing spring.
  • Mechanical energy flows through the mechanism to the lever which connects to the lever arm and chambering mechanism.
  • The mechanism function partially in the case and partially on the exterior of the case.
  • The cocking mechanism is rectangular and looks as if it has a sight on top of it.
  • It has an internal slide track and symmetry down its length from a top view.
  • It is three dimensional.
  • it is 1.5in long by 1in wide by 3/4in high.
  • The shape allows the user to gain traction on it when they are cocking the gun.
  • The cocking mechanism is 1oz
  • Abs plastic polymer
  • Manufacturing decisions such as the speed of production, quantity demanded and cost of labor. With these in mind injection molded plastic was chosen.
  • The smooth finish on the plastic allow the user to comfortably cock the gun.
  • Global: Since plastic is a lightweight material that can be shipped globally, it seemed to be the correct material to market on the global scale.
  • Economic: Since Abs plastic is cheap and can be manufactured into molded components quickly and cheaply. Rather than expensive aluminum or steel.
  • Societal: A plastic piece is lighter than metal and also has the feel of a toy rather than a real gun which makes it more socially acceptable.
  • Environmental:Although plastic in a petroleum byproduct extract, the company choose to use a recyclable plastic.
  • It is green and gray to attract the eye of the consumer and make it obvious it is a separate component used to cock the gun.
  • The finish has ridges in order to make it easy for the user th pull it back.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • Economically Injection Molding (IM) is ideal for plastic parts of this size. It is easy to mass produce these is high volume. Environmentally IM doesn't waste a lot of material. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. A global factor is that they need to place their plant where they can get to petroleum byproducts.
  • 2

Table 18: Firing Spring

Component Function Geometry Weight Material Material: Four Factors Aesthetics Manufacturing Methods Manufacturing: The Four Factors Component Complexity
Firing spring
  • The firing spring is the energy storage system in the gun. It functions to propel the lever arm.
  • The component helps launch the projectile only.
  • Energy flows to and from the spring.
  • The spring operates in the case and under tension.
  • The firing spring has a lever arm and coiled metal spring that are housed in a rectangular plastic piece.
  • The connections are made to translate energy and is made of two different plastics with one being denser than the other.
  • It is three dimensional.

It is 2.5 in high by 1.5in wide and 1in thick.

  • The lever shaped coupled with the coiled spring allow it to project the disc in a forward direction.
  • The firing mechanism is 6oz
  • The firing spring is composed of a coiled metal spring and a had plastic arm.
  • The need to integrate the two parts together as well as mold the arm then include the spring pushed them toward a more dense plastic.
  • The ability of the coiled metal to store energy and the denser plastic to stand up to the forces were the material properties considered.
  • Global: Metal springs are produced world wide which allows Hasbro to produce around the world without having to worry about the availability of raw materials.
  • Economic: Although a torsion spring would deliver more power in this case, the conventional coiled spring was chosen for lower production cost.
  • Societal:A faster shooting gun is more attractive to the general public and influences public opinion of Hasbro as a company. The balance between a fast enough muzzle velocity to make the gun attractive but still not dangerous was a concern when considering the spring.
  • Environmental: The ability for the spring and hard plastic arm to be recycle was considered.
  • Firing spring is shiny metal and a white plastic arm that has no aesthetic purpose.
  • Smooth surface finish for smooth connections and interactions.
  • Injection Molding
  • Riser marks are evident on the plastic so it must be injection molding.
  • Plastic is used so molding is easy and cheap to use
  • The economic factor the firing spring forced engineers to consider was the cost of production and assembly as well as the cost of inputs such as material cost. A global factor is that they need to place their plant where they can get to petroleum byproducts for the plastic in the firing arm. A societal factor of IM is that workers aren't put in danger because a lot of the process is done by machines. Environmentally Injection Molding doesn't waste a lot of material.
  • 3

Solid Modeled Assembly


The CAD package used for the solid modeling was Autodesk Inventor. This solid modeling software was chosen because one group member has had previous experience drawing in this software. It is a user friendly version of the solid modeling software by Autodesk.

Nerf Speed Load 6
Figure 1: Spring Cap
Nerf Speed Load 6
Figure 2: Spring
Nerf Speed Load 6
Figure 3: Cap
Nerf Speed Load 6
Figure 4: Slide
Nerf Speed Load 6
Figure 5: Barrel
Nerf Speed Load 6
Figure 6: Assembled


The components that were chosen to be drawn were of the main function from the Nerf Speed Load 6. Without these parts the gun would have no way of firing the dart as it includes the mechanism to push the air behind the dart.

Engineering Analysis

A key component in any Nerf gun is the spring that causes the gun to fire and supplies the force required to push the moment arm to translate the energy stored in the spring to the projectile. In the Nerf Vigilon Vortex we found the moment arm is restricted by a plastic pin that requires input from the trigger via the user to fire. the force needed to release the arm can be found by using equations of equilibrium. Testing of this product can also be done using certain sensors measure the force being used. Below a analysis problem is set up to show how how an engineer may approach this problem to find the force needed to move. The engineer can vary certain aspects of this problem to get the desired output for the product.

Problem Statement: If the coefficient of static friction between the lever arm and the pin is μ=0.35 and the force the lever arm places on the pin when cocked is 35N, find the force required to pull the pin back and release the arm if the force on the pin is being supplied to the pin via an inclined plane at 45° on the nub as shown in the diagram below.
Diagaram:
Nerf Speed Load 6
Figure 18: Diagram
Nerf Speed Load 6
Figure 19: Actual Location
Assumptions:
  • Assuming the lever arm is incident to the pin at 90°.
  • The nub(shown above) is incident to the inclined plane at 45°.
  • Static friction is greater than kinetic friction.
  • 100% translation of energy and force, neglecting all other friction than those stated.
  • Force of arm on pin is 45N and mu static is 0.35.
  • Once static friction threshold has been overcome, the pin will retract and the arm will be released.


Governing Equations:
F(friction)=(coefficient of friction)*(Normal Force)
F(friction)=(Force needed)*(cos45)


Solution Check: In order to check the mathematical result one could attach a force gauge to the sliding mechanism that is incident on the nub. When the arm is released the reading on the force gauge is the necessary pulling force.


Discussion: For a well designed firing mechanism to operate within the constraint's of the pulling capabilities of their target demographic, mainly kids, the necessary force must be humanly possible. The design factors such as the incident angle on the nub, the coefficient of friction and the force of the arm must be taken into account.

Design Revisions

There are several revisions that were able to be found on the component and subsystem level of the products. Since we compared the two different types of Nerf guns the advantages and disadvantages of the two different guns. From the analysis of both these guns certain factors of both can be seen and which ones need to improve on certain aspects of the guns.

First Revision
The first design revision can be found when comparing the differences in the Nerf Vigilon Vortex and the Nerf Speedload 6. There are several differences in both these guns but one that can be applied to the gun is the simplicity of the product. The Speedload 6 is very similar to the Nerf gun series that have been made in the past. It shoots the darts like the general model of a Nerf gun. The Nerf Vigilon Vortex is a disc shooter. This is a change from the conventional dart shooter that Nerf is known for. When dissecting the product the component system of the firing system turned out to be much more complex than that of the dart shooter. A reason can be the new release of this product in September of 2011. The disc shooter has not been manufactured several times in different ways compared to the dart shooter Speedload 6. When analyzing the Nerf Vigilon Vortex firing system we found:

  • There were several parts pieced together to create the firing mechanism. All these several lose parts were a challenge to keep track of when taking apart the gun to see what the actual function of each was.
  • In order to fix this the small parts should be fused together with the larger part to make it simpler in the making. An adaptive design can be created in order change the complexity and merge the parts into a single part or more larger parts rather than the one part and many small parts.


Economic Factor: The change in the amount of parts will cause the production cost decrease. If the same material of plastic is used in the manufacturing process then the time to manufacture the components for the firing mechanism will be decreased. With the amount of plastic decreasing, the production time decreasing, and the amount parts and complexity of those parts decreasing there will be a sure decrease in the cost.

Environmental Factor: Plastic use is always an issue when it comes to redesign. In this case the use of plastic would decrease and that would be better for the environment. End of life waste has been a concern with consumer products such as Nerf guns for years. A redesign of this nature would reduce the space it would take up in a landfill and with a recycling program could be refurbished and reused.


Second Revision
When dissecting the Speedload Six and the vortex Vigilon we found that both guns were very different. The Speedload six was a very simple gun and the internal components was mainly held together by the casing. The Vigilon was the exact opposite. It was much more complicated than we thought it was going be. There were a lot of different internal components and they were all screwed to one another as well as screwed to the casing of the gun. The one advantage to the way the Vigilon was put together is that the gun had a very smooth loading motion, and the dart shot farther and faster. The Speedload six had a very rough loading motion and its range was pathetic compared to the Vigilons.To make the Speedload Six better there are a few changes we would propose to the internal components:

  • Separate the spring and the chamber components
    Nerf Speed Load 6
    Figure 1: Spring and Chambering components
  • Create a secured connection between the two components
  • Have the components secured down to the casing as well as each other

We want to take what makes the Vigilon’s internal components work well together and translate that to the Speedload Six. For the change we feel that if we separate the spring component from the chamber and loading component we can make gun more efficient. We want to make this change because it would hopefully fix the rough loading problem that the Speedload six has. It would also increase the quality of the gun. If were to make the first change we would have to have a secure connection between the two components so that they stay together and work in unison. We want to secure then secure the components to the casing because another problem we identified when we opened up the gun was the fact that a lot of the internal components were loose. If we secure them to the casing then more of the potential energy can be converted directly to the dart rather than being lost because of the loose connection between the components and the gun. Making these changes would alter a couple of the four factors.

Economic Factor: Economically it may cost a little more manufacture. You would have to change the molds for the parts and pay people to re-design the gun. It shouldn’t cost more for the consumer because the Vigilon was the same price as the Speedload six and the Vigilon had way more parts.

Societal Factor: Safety would be an issue with the proposed changes. If the gun is more efficient then the dart will shoot faster and farther and safety would have to examined a little more carefully. The maximum velocity a dart can have without injuring someone should be determined and the new velocity must remain safely under that velocity. The way the guns are viewed by the public will also change, if they shoot tooo fast and can be considered harmful then most people will view them as a weapon.

Environmental factor: The plastic use is always a factor. You may need to use a little bit more plastic to make this gun better and more efficient. Plus you would have to dispose of the old molds in and environmentally safe way. With the new mold design they could incorporate a grey water cooling system or a mold that produces less scrap.


Third Revision

One of our design changes for the Speed Load Six would be a redesign of the integrated clip. The main function of the integrated clip leads to the name of the gun which is speed loading. The gun is designed for the Nerf Dart tag and the integrated clip is so you can load your darts on the go. We as a group feel that redesigning the clip would increase the quality and function of the gun. The design changes we are proposing are:
Nerf Speed Load 6
Current Integrated Clip
  • Make the clip removable
  • Make the removable clip act as an integrated clip while attached to the gun.

This redesign would be a variant design and be innovative to the Nerf product line. Nerf currently has removable clip models and integrated clip models, but not an all in one. Although the redesign would require a change to the clip, the overall function of the gun would not change but rather be expanded.

Economic factors: The redesign would have a high initial cost due to man hours for the redesign, product testing and marketing. However the revenue we feel Nerf can generate from interchangeable integrated clips would overcome the initial cost of redesign and generate profit without having to invent new technology or design a whole new model. Being able to produce clips for the speed six that are interchangeable can be eventually be extended to other models and reduce production cost due to specialization and reduction in the variations in parts. The interchangeable clips could be sold separately which will make them a complementary product to the gun itself, which in economic terms allows each product to generate demand for each other.

Environmental Factor: An environmental impact would be the excess plastic used to make the removable clip, and the excess plastic and cardboard required to package the clips individually. These removable clips would have a negative impact on the environment and may cause damage to the companies reputation. However if they were to design the new clips to use recycled plastic then they could actually reduce their impact on the environment . Increase fuel consumption for the transportation of these clips would also be a factor.