Group 9 - Skilsaw Circular Saw 2

Gate 1: Project Planning

Work Proposal

Skil 54HD Circular Saw

Intro to Group:

• Faisal Jaffri
  • Faisal has had some experience in CAD. Faisal has taken more courses that relate to our object. Faisal has worked in his dads shop often, which involved working on cars so he has had a lot of experience with different tools. His strengths include the ability to communicate with others effectively as well as a strong background in mechanics. Faisal's weaknesses include his ability to stay focused on the task and occasionally makes grammatical errors. His weaknesses require valuable skills which he should improve.

• Michael Schwab
  • Michael has also had some experience with the CAD program as well as Rhino. Michael has had experience with this specific tool, which may benefit the group as well has having basic knowledge of tools being introduced to many in high school. Michael is not very strong in the public speaking area, which could use improvement; This surly affected our role designation decision. Also, Michael occasionally procrastinates on assignments.

• Kyle Wiedemann
  • Kyle has done some work with the CAD program. Kyle was also pretty familiar with the Autodesk inventor program at his high school. Kyle has the basic knowledge of how tools are suppose to be used and the process of disassembling something. Kyle has had public speaking experience, but has not had to present anything to a large group of people. This is a weakness for the group because Kyle has not had experience with a large group of people, similar to the amount of student in our lecture.

• William Dutcher
  • William has had the same CAD experience as the rest of the group, just introduced to the program. William is able to use tools and able to take things apart, which is important. William has also had experience in a machine shop. William seems to be the best technical writer in the group according to the first few assignments.

• Sherif Omar Azmy
  • Sherif has had some beginner level work in the CAD program just like the rest of our group. Sherif has had experience working with electronic systems. Sherif has also had some experience in modifications to cars. He is not a very strong technical writer which is a weakness, but he is very familiar electronic devices, both hardware and software.

Disassembly/Reassembly Plan:

This part of the project will consist of our group taking apart the saw from the outer components inward. We will write down, take pictures, and diagram every step so that we have a clear and concise record of our actions. We all plan to participate taking the object apart. This will introduce each group member with the equipment so we all have an understanding about taking the object apart should another member be busy. It will also allow the deconstruction process to be much faster. We plan that the necessary tools for the job will be readily available being that it is a home use product and is designed for tools found in an everyday house. However, if we get to a position in which we need a specialized tool our group will discuss it and decide what the options are. For the reassembly of our product we will use our carefully noted directions for disassembly and reverse the process. It will require the same type of tools as disassembly, but used in reverse order. We will then test the product to assure that it is in working condition and properly assembled. Management Proposal:

Project Roles:

Project Manager: Kyle Wiedemann (kylewied@buffalo.edu)

The project managers job includes being the one that gets the group members information and putting it together in a neat and organized way. The project manager has the responsibility of getting information from the others so that transition to the wiki page is easy. The manager helps decide whether meetings take place depending on the amount of work that is done and needed to be done at the time.

Wiki Expert: Michael Schwab (mrschwab@buffalo.edu)

The Wiki Page Manager has a job to become familiar with the usage of the wiki page. This person is responsible for putting the data into the wiki page with a neat format and good usage of tables or charts. This person is in charge of getting photographs, charts or graphs to the wiki report.

Deconstructionist: Sherif Omar Azmy (sheriazm@buffalo.edu)

The Job of the deconstructionist is to be the person who takes apart the Skil saw and becomes familiar with the saw and its components. This person also has the responsibility of putting that product back together all in one piece.

Team Scribe: William Dutcher (wsdutche@buffalo.edu)

The team scribe has the responsibility to write everything down. This is the person who writes down a detailed document of what went on during the project, this is especially important in the dissection of the saw in order to put it back together right. This person should also document when meetings occur, when they start, end, what was covered and who was there.

Time Coordinator: Faisal Jaffri (faisalja@buffalo.edu)

The job of the time keeper is to make sure that project is going to be done on time. This includes a creation of a schedule of dates that show a plan when possible meetings could be. If any part is lagging behind the others, the time keepers job is to help them in any way they can. The time keeper could be considered to be assistant to everyone.

Management Proposal

Schedule Chart:

This Gantt chart is going to act as schedule for our group. We plan to be working on the specified task while there is a red bar present to a corresponding task.

Meetings:

Meetings will take place after every session of class either in the lab or in Capen Library for approximately one hour and the hour before lecture. The idea of having meetings after this class is based on the fact that every member of our group is done with classes after that class so we all know that every other member should be able to attend. At each meeting we will document who is there, and if they are not there we will try to document why they were not there. The goal of the meeting is to make sure everyone is doing their part of the project and to insure that our group will be able to make the given deadline. The decision on whether the group will work together during the meeting will be decided by the group based upon what is all ready done and what is needed to be done.

Group Conflicts:

If there is a conflict in a way to do something, it will be dealt with by allowing the two who have different views to explain their view to the others in the group present. These other people in the group ultimately side with one way or another, majority of votes wins. If there is a conflict that involves one not doing their work sufficiently or not showing up to the meetings then there will be a notation in the report that says what he was assigned and did. This will be followed with a notation of who covered their work, and the possibility of an email to the instructor if the conflict is worth that attention.

Preparation and Initial Assessment

Preparation and Initial Assessment:

This product was intended to be sold in America, Canada, and Puerto Rico. The 54HD Skil saw's design is similar to Michel Electric Hand Saw's first, patented circular saw of 1923. It is intended to be a small yet powerful circular saw that can make precision cuts at different depths and angles with ease. The economic concerns were trying to make a saw that could have enough power and versatility while still selling for a relatively cheap price as well as supporting the product in the warranty honoring countries of America, Canada, and Puerto Rico. A global concern for the developers of this product is where to acquire the materials.

The intended use of this product is to make precision cuts in basic building materials such as wood or light metals. This product given its size and power output would primarily be used for small home type projects although it would have the capability to be used professionally. For example, it can be used by a carpenter for construction of a house. There is only one type of job for this piece of equipment and that is to cut materials. However, it provides some options as far as depth of cuts and the angle at which cuts are made. There is also an option to replace or switch the blade being used.

There are a few types of energy that are used in the Skil saw. The first type of energy that is used is electrical energy. Another form of energy that is used by the Skil Saw is mechanical energy. The saw runs by importing energy through the electrical cord that plugs into the wall. The energy provided through the wall outlet allows the saw to function by getting that energy to other parts of the saw by converting one form of energy to another. The energy travels from the outlet in the wall to the electromagnetic motor. The electromagnetic motor uses magnetism and electric current to generate power that is transmitted through the shaft of the motor into the gear system, which is then transferred to the blade of the saw. This is a transformation of electrical to electromagnetic to mechanical energy.

There are approximately twenty five components to our product. These components are listed in the table below.

#	Component Name	#	Component Name
1	Housing	14	Blade Wrench
2	Field Magnet	15	Carbon Brush Set
3	Trigger	16	Set Handles
4	Screw 1	17	Blade Housing
5	Screw 2	18	Blade Guard
6	Screw 3	19	Bearing Assembly
7	Spring 4	20	Motor
8	Casing Foot	21	Pinion Shaft
9	Round Head Bolt	22	Supporting Disk
10	Wing Nut	23	Housing Cover
11	Rubber Stop	24	Lever
12	Rubber Stop Screw	25	Bearing Sleeve
13	Blade Screw

Many of the components are fairly simple, such as the screws, stoppers, the blade wrench. A few of the components have a mild complexity such as the housing cover, trigger, blade guard and blade housing since they require dimensions to be pretty accurate and precise in order to give a straight cut while giving the user a good aesthetic feel.

Other parts such as the bearing, the motor and the carbon brush set are very complex. The Carbon Brush set allows the motor to work when positioned right, the motor is made up of coils of wire inside and magnets to transform electrical energy to mechanical energy. The bearing assembly is complex because of the individual ball bearings and the precision required in the manufacturing of the assembly. The component interactions are very complex. For example, the Carbon Brush must be positioned correctly for the motor to work, which is where the transformation from electrical to mechanical energy occurs. The gear system that turns the blade is also very complex because of the gear ratios relationship. This is complex because there was most likely a desired rpm of the blade so it could make clean cuts.

The materials that are clearly visible are plastic, used for the handle and motor cover, and both stainless and galvanized steel (iron, aluminum, or steel coated with a thin zinc layer), used for the metal disc (or blade) and the trim around it. Other materials that are not visible, but are likely to have been used are aluminum, copper for inside the moor, and different kinds of steel.

The Skil saw has a knob on the front designed for a comfortable and firm grip as well as also preventing possible kickback. The trigger handle has a grip on it, increasing control over the tool. The saw appears to be designed for right handed people; otherwise the blade will be between the user and the two handles. The saw also has a line guide, helping the user ensure straight cuts through the material.

The Skil saw is not very intuitive because the user must do everything in order to accomplish the task. A saw that is intuitive would perhaps slightly move through the material itself because it knows the user will have to force the saw forward through the material anyways. The Skil circular saw can be very easy to use, if the user reads and comprehends the owner's manual and is above a desire age determined by the manufacturer. Power tools, such as the circular saw, are very dangerous and the manual should be read by the user to ensure safety as well as ease of use.

There is not a lot of maintenance required the Skil circular saw. One important part is the blade. Working with a dull blade can make cutting difficult and can be dangerous, so any dull blades should be replaced with a new one. Other maintenance required is simply checking components such as the tightening bolt, the screws on the handle, and the blade arbor bolt. Checking these components can greatly reduce the chance of injury. Also, the user should use clean compressed air to remove any foreign materials from the saw. Some parts of the saw may be difficult to replace, such as anything inside the plastic outside covering. Overall, the maintenance for the Skil circular saw that is down by the user is very easy considering the most common parts that would need to be replaced are the trigger (easy to get to) and the blade (tool provided by manufacturer).

There are a plethora of product alternatives to the Skil circular saw. Skil must compete with brand names such as Milwaukee, DeWalt, and Craftsman. Perhaps one of the better brands of circular saws that is a major competitor is Milwaukee. The advantages of a Milwaukee circular saw are the comfort of use, reliable blade guard and brake, quick bevel adjustments, sturdiness, and a five year warranty. The Milwaukee saw does have its disadvantages though. The saw is not designed for left handed users, so it blows sawdust towards the user. Also, the base tends to slip occasionally and the rip fence is extra money, about ten dollars. The Skil circular saw does not really compare to the other saws that are available, but the price is lower. A Milwaukee saw that is the most similar to the Skil 54HD saw is $139, while the Skil 54HD saw is about $55 on the website of a Skil retailer founded on the Skil website. The DeWalt saw can also be found at about $139.

http://www.consumersearch.com/circular-saws/sears-craftsman-10871/specs - Specs for Sears Craftsman 10871

http://www.consumersearch.com/circular-saws/milwaukee-6394-21/specs - Specs for Milwaukee 6394-21

References

"Circular Saw Maintenance Tips." Home Improvement Tips, Tool Reviews, How-To Articles, Cool Products, Free Tools, and DIY Resources, All Delivered Funny. Web. 02 Oct. 2010. <http://homefixated.com/2010/03/11/circular-saw-maintenance-tips/>.

"Circular Saw." Wikipedia, the Free Encyclopedia. Web. 06 Oct. 2010. <http://en.wikipedia.org/wiki/Circular_saw>.

"Hot-dip Galvanizing." Wikipedia, the Free Encyclopedia. Web. 07 Oct. 2010. <http://en.wikipedia.org/wiki/Galvanized_steel>.

"Milwaukee 6394-21 Review." Product Reviews and Reports - ConsumerSearch.com. Web. 06 Oct. 2010. <http://www.consumersearch.com/circular-saws/milwaukee-6394-21>.

"Milwaukee 6394-21 Specs - Specifications for Circular Saw." Product Reviews and Reports - ConsumerSearch.com. Web. 27 Oct. 2010. <http://www.consumersearch.com/circular-saws/milwaukee-6394-21/specs>.

"Sears Craftsman 10871 Specs - Specifications for Circular Saw." Product Reviews and Reports - ConsumerSearch.com. Web. 27 Oct. 2010. <http://www.consumersearch.com/circular-saws/sears-craftsman-10871/specs>.

"SKIL 7-1/4" Circular Saw 54HD." Fast Specialty Shopping - Toys, Health/Beauty Aids, Office, and Home. Web. 04 Oct. 2010. <http://www.gogoods.com/product/PPI-DS2445/SKIL-7-14-Circular-Saw-54HD.html>.

"Top 7 Cordless Circular Saw Comparison: Makita vs. DeWalt vs. Milwaukee and MORE! | ToolCrib.com Blog." At ToolCrib.com You'll Find Power Tools, Power Tool Reviews and Cordless Power Tools at ToolCrib.com, Your Tool Crib Online. Web. 04 Oct. 2010. <http://www.toolcrib.com/blog/2009/03/17/top-7-cordless-circular-saw-comparison-makita-vs-dewalt-vs-milwaukee-and-more/>.

"View Source - GICLWiki." Redirecting. Web. 01 Oct. 2010. <http://gicl.cs.drexel.edu/wiki-data/index.php?title=Group_3_-_Skil_Circular_Saw&action=edit>.

Gate 2: Product Dissection

Cause for Corrective Action

This is a group assessment of the work that was done during the disassembly of the Skil Saw compared to how our group planned to take the Skil Saw apart. This also includes everything that happened, even any group conflicts.

The Management plan of our group has been working out pretty well. We decided that the best time to meet would be right after class because everyone would be around campus and everyone stated that they should be free during that time. This plan made it convenient to meet after class. The meetings were held on Mondays and Wednesdays and lasted between a half hour and two hours. The group would start the meeting by figuring out whether we were on the right course for getting the gate done in time and exchanging any information for the gate with each other (Especially with the member uploading information to wiki up). If we were on schedule then we would simply assign the tasks needed to be assigned evenly throughout the group and then ended the meeting. This was our meeting routine when we meet, and we were able to complete our task on time with this meeting schedule.

Our group put the dissection plan that we proposed to good use. We followed our plan of just starting from the outside and working inward. The actual dissection of the Skil Saw was done in just one meeting that took place after class one day. The disassembly halted our group for a little while when we first started our disassembly, but after we got ourselves organized the procedure went very smooth. We had two people handing the Skil Saw and removing pieces from it with the tools that were required, one group member did a chart in Excel, another member took pictures to document our progress and the final member made sure that everything was done at the right pace so no one got too far ahead. This was done so that the order the saw was taken apart would be the complete reverse of how we put it together. During the dissection of the Skil Saw we noticed in several places that there was damage done during previous disassemblies. Some of these include the metal sleeve that connect a wire from the trigger system to the outer part of the electric motor, one of the washers for the inner part of the electromagnetic motor was bent terribly and finally the piece that held the blade plane to the body of the saw seemed to be forced back into place.

Taking the saw apart in one meeting shows that our group was able to work together, so it was not surprising that conflicts between group members did not occur. The small problems that took place during the dissection were quickly solved by the group. For example, the member of the group who did the table on Excel claimed he would probably be able to do a better job on the part where a description of how the difficulty of each question was. Someone else in the group wanted to do this part at first, but after hearing the comment from the other group member he quickly made sense of it and understood that the group agreed on this being the best way to approach that particular spot on gate 2.

Subsystem Connections

The motor and field magnet are two components that combined are called the electromagnetic motor. The field magnet is mounted physically on the plastic housing via two screws. The field magnet is connected to two wires, each with two split pieces that connect to the field magnet. Both wires are connected to the trigger subsystem. The field magnet makes the motor turn within the saw housing and a washer piece that is mounted at the other end of the plastic housing. The end of the motor is connected to the saw housing, to create a gear system. These are connected using screws rather than a glue or other adhesive so they are securely fashioned and will not move during use. The motor and field magnet work together with the force created by the magnetic field. The magnetic field force is created by the electrical charge put through it by the wires which then causes the motor to rotate with the right amount of torque. A fan that is placed on the shaft leading to the gears system is designed to help cool the inner system of the Skil Saw. Different materials could probably be used to create the electromagnetic motor system, such as silver instead of copper since it conducts electricity well, but since a desired rpm and performance is required for the saw then the best way to go is to choose the cheapest materials that still give the quality and performance desired by the designers.

The connection of the trigger and the electromagnetic motor with the wire is important, this is another subsystem to subsystem connection. Without the trigger completing the circuit and sending the current through the wire then the saw will not be powered and would not perform its desired function of cutting the specified material. This means that the trigger must be held at all times during the use of the product. The trigger has a total of four wires going through and coming out of it, along with another plastic piece that has been embedded as a safety feature. The two copper wires going through the trigger are white (positive) and black (ground), provide the electrical energy flow coming from the plug plugged into the A/C outlet. They are heavily insulated using rubber. In order for the trigger to bridge the connection between the two wires and thereby completing the circuit requires first pushing the safety feature button, which is operated by a spring mechanism, to either side horizontally (right or left). Once the circuit has been complete, two black copper wires (assuming one is positive and one is ground) are used to deliver the flow of electrical energy to the mechanical motor The motor shaft must be spun at a certain speed and allowed to create a certain amount of torque by the magnetic field force so that it can cut the material properly without any danger. The wires are made from cooper because they conduct electricity well and it is a fairly cheap material, which plays an important role for sales and the price people want to spend for certain products for certain tasks. Using a different material maybe cause a higher rpm or lower rpm for the saw blade, but since a specified rpm is desired for a proper cut changing the gear sizes could adjust the rpm to the desired rpm for proper cuts. So using copper may have the best combination of gear cost compared to other materials costs and their respective gear costs.

There is very fundamental connection between the electromagnetic motor system and the gear system. These two systems are connected physically where the gear intertwines with the gear on the end of the shaft of the electromagnetic motor. They interact through rotational energy and motion. This interaction is designed to create a desired rpm that will allow the saw to cut materials properly and create a smooth cut and does not cause safety problems. The material is chosen depending on its properties and its price, which determine the quality and performance of the saw. A saw could use a strong material for the shaft system and a different gear system that results in an increase in performance. Such a saw would cost more and not be as economically viable. Some environmental concerns could be from the material being cut, such as the waste produced during the production of the material being cut. The price of the steel and motor materials were an influence economically, and an overall global factor is customer location and were to get materials from.

There is also an Air flow system that interacts with pretty much everything. Through dissection our group noted that there were clearly places were air was intended to flow out of the system and carried heat away as well as direct sawdust away with help of other systems. These systems include the body system of the saw with the open slits in the body for air to flow out and the blade guard and base plate directing saw dust generally away from the users face, although precautions are highly advised to prevent injury to the eyes. Without a cooling system the inside of the saw could easily overheat and cause problems for the user, which is definitely not a desired outcome.

There is definitely a specific arrangement of the subsystems. For example, the first subsystem that is use by the person using the saw is the cut-adjustment subsystem. This sub system allows the user to be able to set up the dimensions of the desired cut before even giving power to the saw. The next subsystem is the trigger system. This is one of the most important subsystems in the circular Skil saw because it must be held in to complete the circuit at all times during use of the product, others the product, material being cut or the user could suffer damage. The trigger allows the electricity from the cord plugged into the wall to travel into the coils of the electromagnetic motor. This is where the electromagnetic motor changes the electrical energy into the rotational energy of the motor. The energy that comes out of the motor through the shaft goes to the gear subsystem, which changes rotational energy into mechanical energy of the blade cutting the specified material. The gear system could not be in front of the electromagnetic motor cause the user needs electrical to mechanical energy, not mechanical to electrical. Also the gear system could not be next to the trigger system cause the blade cannot use electrical energy directly, it must be converted in order for the blade to spin.

There were many concerns when the Skil saw was being developed, including economic, social, environmental, and global concerns. The economic concerns were material performance and cost, and where the materials came from. Certain areas of the world have real cheap labor, but the quality of the product is not as good. Other areas of the world have more expensive labor, but make a significantly better product. Using a good materials mean the product will last longer. There were many social concerns during production of the Skil saw. The most important is concern is safety. When used properly, as well as the safety guards, the saw can be very safe. Another social concern is noise. Power tools such as the circular saw are very loud, which could bother many people nearby. The last social concern is the kind of job being done. The developers needed to design the saw to handle the conditions that the user is using the saw under. An environmental concern during development of the Skil saw is disposing unused parts, or saws as a whole. Proper disposal is required when throwing away the saw or parts. Finally, there is a global concern, which is the potential buyers market. This product was intended to be sold in the United States, Canada, and Puerto Rico.

Step	Description	Tool(s)	Level of Difficulty
1	Remove angle adjusting wing nut bolt	hand	1
2	Remove saw blade head bolt and washers	wrench provided by manufacturer	2
3	Removed rubber stopper for blade guard	Torx wrench T27	2
4	Removed four large outer radious screws holding blade casing to plastic body of saw	Torx wrench T20	2
5	Removed 3 small inside radius screws and spring holding blade guard to blade housing, removed blade guard from housing	Torx wrench T20	2
6	Removed gear held in by blade guard	hand	2
7	Removed 2 screws holding ventilation cover	Torx wrench T20	2
8	Removed 5 of 6 screws holding ventilation cover (1 missing)	Torx wrench T20	3
9	Take trigger mechanism out of handle housing	hand	1
10	Remove plastic handle from spring loaded blade guard	Torx Wrench T20	2
11	Remove blade depth adjuster	hand	3
12	Remove metal blade housing from plastic body	hand	1
13	Remove inner shaft from blade housing (fan and inner magnetic coil	hand	1
14	Remove large screws holding outer magnetic coil in plastic body	Torx wrench T20	2
15	Removed spring loaded clips holding outer electromagnetic in plastic casing	pliers	5
16	Removed outer electromagnet from plastic body housing	hand	1
17	Removed electromagnet from wire clips connected to trigger mechanism	hand	1
18	Removed shaft stabalizer from the end of plastic housing	hand	1
19	Removed wires and trigger from plastic frame and blade plane	hand	1

We created a scale for our dissection from 1-10. A score of 1 would mean that this step was very easy and required only hand work and could be done in seconds. A score of 10 meant that the step took multiple tools and processes as well as taking a length of time (ex. 30 min). A score of 5 meant that the step took moderate work including tools and a few minutes of time for the disassembly of the part. Our product is designed with an easy disassembly, however not all of the parts are truly designed to be taken apart by a normal user. Parts like the blade guard and housing are very quick to take apart using same size torx screws. A head bolt tool provided and secured in the base of the saw allows for easy removal and switching of different saw blades. The trigger casing and handle made of plastic are intended to be taken apart so if the trigger mechanism breaks it can be replaced easily. Other parts like the internal electromagnetic motor coils, gear, fan, and shaft are not intended to be disassembled. Due to the product cost it is easier for the consumer to just buy another saw. The saw is also built with components for quick adjustments including the options to change the depth and angle of the cut, which can be adjusted by a simple hand of the user.

References

Robert Bosch Tool Corporation. Skil Tools. Robert Bosch Tool Corporation, 2010. Owners Manuals and Parts Lists. 2010. Web. 21 Oct. 2010. <http://www.skiltools.com/rb/Development/NA/POWERTOOLS/SKIL/mcms/Templates/Unique/OwnerManualPartList.aspx?NRMODE=Published&NRNODEGUID={16095CF6-D5BB-47D6-9A1F-C8588D677C03}&NRORIGINALURL=%2fen%2fCustomerService%2fPartsListsOwnerManuals%2f&NRCACHEHINT=Guest>.

Gate 3: Product Analysis

Coordination Review

Our group has been working together pretty well throughout the project, with a few minor bumps along the road. These include the assigning of roles throughout the project. This is the one problem that seems to come up with the beginning of every new gate. The first few times as a group we discussed who would like which role and why. These all ways seemed to work, however the role assignment for gate 3 was a little different. Each individual of the group read over the gate before a meeting, and at the start of the meeting if you knew what you wanted you wrote your name under that section of the gate. There were no problems with this assigning system, but this system is not recommended to avoid any group conflicts, just because it works once doesn’t mean it will work again. Besides these minor setbacks at the beginning of the gates there have not been any conflicts. There are no unresolved challenges in the group, The last one solved was which individual would do the presentation, which was not hard to do since the individual chosen doesn’t mind it at all, especially when that individual didn’t have to work on gate 4, but just work on the presentation.

Gate 5: Delivery

Component and Part Number	Photo	Component's Function	Materials Used	Manufacturing Process	Reason component is made out of specific material	Attributes of Part	Part # is "Saw Explosion" found above
Housing 2 610 912 983	PHOTO	Hold the internal electromagnetic motor in place and keep the shaft and inner components protected.	Plastic	Plastic injected into mold and let to solidify	Plastic is a durable material which is light making it easier on the user. Plastic is also relatively cheap which will keep the product cost down	Hard plastic protects inside and allows flow of air. Also aesthetic shape given to the housing	1
Field Magnet 2 610 341 367	PHOTO	Provide electrical current which causes the inner electromagnetic motor to rotate providing a turning force to the saw blade	Copper and Plastic	The copper wire is drawn providing the small cylindrical shape, the plastic is injected into a mold and let to solidify	Plastic is cheap and a good material for a housing for the copper wires because it is a good insulator for the copper wires which have current put through them. The copper wires are a good conductor of electricity while also being cheap to produce	Wires are spun in a certain coil pattern to provede optimal electromagnetic force used to spin the inner electromagnetic motor	2
Trigger 2 610 917 325	PHOTO	Act as a switch allowing power to motor when operator desires	Plastic	Plastic injected into mold and let to solidify	Part is made out of plastic because it is durable and can take a constant pressing by the user. It is also cheap and will keep parts cost down	Part is made to fit the shape of the human finger which is what interacts with it. Also built with a safety the user must toggle for extra protection	4
Screw 1 2 610 341 364	PHOTO	Holds plastic handle molding of the saw together	Steel	Steel is extruded and then lathed to apply the threading	Part is made from steel because it has to be strong enough to hold the handle together while still being cheap enough to keep total product cost down	(Three) Torx 20 bit screws are used	19
Screw 2 2 610 341 365	PHOTO	Holds the blade housing together with the housing of the saw (shaft, electromagnetic motor, field magnet, etc)	Steel	steel is extruded and then lathed to apply the threading	Part is made from steel because it has to be strong enough to hold the saw blade housing together with the plastic housing of the body of the saw while still being cheap enough to keep total product cost down	(Three) Torx 20 bit screws are used	27