Group 17: Gate 1: Project Planning
Project Management: Request for Proposal
Proper analysis of the weedwhacker will require a full dissection. The weedwacker will be fully taken apart starting at the point where the motor meets the body. The motor and the rest of the weewacker including the body, blade and shield will then be dissected and analyzed separately. The team will be divided into two groups one group will be dissecting the motor and the other group will be dissecting the rest of the weedwacker. Dissection of the product should take approximately three hours for the group or fifteen man hours to complete. In order to provide a reference for analysis the dissection will be videotaped, clips of the video will also be used to clarify the analysis report. Tools required for dissection:
- Nut Drivers
- Pliers (needle nose)
- Screwdrivers, Phillips and flat
- Allen wrenches
- Ratchet and socket (deep well and standard)
- Possibly torx bits
The engine poses the greatest challenge for dissection. Its compact complex nature makes it challenging to maneuver tools inside of the engine to take it apart. Also, the engine’s many subsystems will make it difficult to analyze.
The body could also pose a challenge for dissection. The drive shaft is enclosed in a solid cylindrical aluminum case, which could make it difficult to analyze the mechanisms used in the drive shaft.
The group’s main weakness is an ability to analyze the product with the intent of appropriately fulfilling the project requirements. The group has the mathematical understanding to analyze the product for mechanical function. However, analyzing the product in light of the design process responsible for the development of the weedwacker is a level of critical thinking unfamiliar to the members of the group.
Individually the members of the group possess skills that will help aid in the completion of the project. Jeff Scott has a developed understanding of engine mechanics and will be an asset in the dissection and analysis the weedwacker engine. Ryan Edmondson and Mike Gold are both strong in mechanical and physical assessment, as well as product research. Shawn Milligan is proving superior technical support by managing the group wiki website, as well as handling video editing. Ryan Fiust-Klink is responsible for developing and editing all technical documents produced by the group.
For each gateway the work will be divided between the members as equally as possible based on time requirement. All work done will then be reviewed by the group, and then passed on to Ryan Fiust-Klink for editing, then given to Shawn Milligan to be posted to the wiki website.
The group plans to meet on Wednesday’s at 5:00pm in order to discuss assignment responsibilities and progress.
Ryan Edmonson - Technical Analyst
Mike Gold – Technical Analyst
Ryan Fiust-Klink- Report Editor
Shawn Milligan - Wiki Account Manager
Jeff Scott – Project Coordinator
Technical Analyst – check and review mathematical computations used in analysis
Report Editor – read and review all technical documentation for cohesion and completeness
Wiki Account Manager – upload and format all documentation to wiki
Project Coordinator – organize and communicate a plan for project completion
Preparation and Initial Assessment
- Development Profile: The weedwacker was developed with first world countries in mind. The purpose was to make it easier to care for your lawn and lighten the workload on people.
- Usage Profile: The intended use of the product was the removal of unwanted foliage and weeds around a person’s property. Our particular product is for normal home use, as it would not last long enough to be feasible in the professional sector. The weed whacker can be used to remove weed, and to edge driveways and sidewalks.
- Energy Profile: The system uses mechanical and thermal energy. Energy is imported into the system by way of the chemical potential energy stored in gasoline. Energy is transformed and modified through the use of heat to create compression in the cylinder, which transforms heat energy into mechanical energy by moving the piston; in turn exerting a moment on the crankshaft.
- Complexity Profile: The three main components of the weedwacker are the motor, the control system (throttle, pull cord, etc.), and the shaft and head of the weed whacker. The motor is the most complex component of the product. The throttle, shaft, and weed whacker head are all fairly simple due to their small number of parts and lack of complexity.
- Material Profile: Plastic coverings, steel, and rubber are clearly visible, but we would assume that there are some other types of metals within the weedwacker, such as copper in the ignition wire, and platinum or iridium in the spark plug. In addition, the crankcase and cylinder body are most likely made of aluminum or cast iron, while the air filter is made of some kind of cloth or paper.
- User Interaction Profile: The user interfaces with the product through the use of the throttle, pull cord, choke, primer, and kill switch. The starting procedure may not be very intuitive, but there is a step by step set of instructions on the weed whacker that tell you how to start it efficiently. The throttle system is very intuitive because you just squeeze the trigger to increase the speed of the motor. The only maintenance required is to change the spark plug once a year so that it runs correctly, keep the choke and throttle body clean, change the air filter regularly, and to refill the weedwacker string when it runs out. No oil changes are required because it is a two stroke motor, and the oil is mixed in with the gas. All required maintenance is very simple and virtually anyone would be capable of performing it.
- Product Alternative Profile: Alternatives to the gas weedwacker include hedge trimmers and lawn shears. The advantages of these products are that they are cheap and require no gasoline. Other alternatives include electric weedwackers, with the closest competition coming from those powered by wet-cell batteries. The only maintenance necessary to hedge trimmers and lawn shears are is to sharpen them so that they cut correctly. The disadvantage to these products is that they are many times slower than the weed whacker that we plan to dissect. The difference in cost may only be about 40 to 50 dollars considering how cheap a weed whacker can be bought in 2012. Considering the small cost difference and the performance difference, the weedwacker is definitely the best choice for the job with all things considered.