Group 2 Gate 1

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Gate 1

Work Proposal

General Plan

The product that our group will be reverse engineering is the Eager Beaver chainsaw. Given the complexity and number of moving parts present in this product it is necessary to take extraordinary caution to make sure we are able to put all components of the device back in their original working locations. For this purpose there will be 2 people documenting how the product is being taken apart. One person’s job will be to document a written instructions list that can be followed in reverse to reassemble the product. The other person’s job will be to capture a visual representation of each step with a digital camera. Visual and written documentation should be descriptive enough to allow the reassembly of the product by any given group member.


The disassembly of the chainsaw itself will be a challenge again because of the number of components involved. On the outside alone there are 19 visible fasteners all of which can be removed with a socket wrench or a flat head screwdriver. One of the largest challenges we will face is not knowing exactly we will find inside of the chainsaw as far as fasteners go. It can be assumed that the fasteners will probably be similar to those found on the outside however we will also be prepared in case there is a need for more unique tools that may be needed for the fasteners used inside of the device as we will be in the machine shop with a large number of tools. We expect to find internal components of the chainsaw to be an engine, air filtration system, fuel tank, small chain oil tank, as well as a small alternator. Each one of these components will need to be examined, documented, and then dissected further. The engine will be the main focus of the dissection as it will be the most complicated component. From examining the chainsaw it can be seen that there is only one spark plug. This leads us to believe the engine will simply have one piston. This will assist in the dissection, as it will mean there are minimal moving parts as opposed to a 2, 3, or 4 piston engine which are much more complicated.
\'\'\' Tools Needed: \'\'\'

  • Wrench
  • Screw driver
  • Key socket 5/32\'\'

Group Analysis

The group in which we will be dissecting this product consists of five members. All of the group members are Mechanical Engineers and have a basic understanding of the physics that take place within a standard chainsaw. Although no one in the group has ever dissected a chainsaw before that is not to say no one has worked on complicated mechanical products. The group has several members who have worked on cars which have several matching components of those found in a chainsaw just scaled up to work in a vehicle. Another positive aspect to this group is that all 5 members live in the same building so group communication should be no problem at all. This being said it all of the group members are also very busy on a day to day basis and have limited time to work on this project. A huge challenge for this group is going to be finding the time to dissect and analyze the chain saw. The group is going to need to organize and learn to be flexible in order to accommodate everyone’s schedules. A figure of all the members\' strengths and weaknesses are displayed in Table 1.

\'\'\'Capabilities Chart\'\'\'

Table 1: Group Member Strengths and Weaknesses
Member Strengths Weaknesses
Nick Kier • Good coordinator
• Thinks outside the box
• Mechanical and electrical experience
• Good at following directions
• No experience with Wiki
• Easily distracted
• Time management
Russell Pernal • Motivation skills
• Good communicator
• Linguistic acrobat
• Mechanical experience
• Limited experience in dissections
• Easily Distracted
• No experience with Wiki
Brad Anderson • Working knowledge in AutoDesk Inventor
• Self motivating
• Previous experience in dissections
• Works well in groups
• Bad planner
• Technical writing
• Little experience with HTML
Adam Chamberlain • Strong engineering principles knowledge
• Extensive knowledge of tools
• Works well in groups
•Mechanical experience
• Quick learner
• Irritable
• No experience with Wiki
• Technical writing
• Little motivation
Ryan Brion • Task oriented
• Thorough note taker/documenter
• Works well in groups
• Time management
• No experience with Wiki
• Technical writing
• Needs instruction

Live Update of Group Calendar

The link below shows a live calendar of the project progress. Future dates represent current plans and goals. Past dates represent completed tasks.

Management Proposal

Fortunately for the group, three of the five members live in the same suite, and the other two live in the same building. As a result of this, it will not be difficult for the entire group to meet at a common location. In addition to this spur of the moment meeting, which will be used when necessary, we will have two meeting dates a week to work in the dissection lab. The first day that we will meet every week is on Monday at roughly 6PM. We will leave the lecture at 5PM and then begin working in the dissection lab at 6PM. The other day that we will meet will be Wednesday at the same time. These two days are the planned meeting days; however, we may meet more often as we see fit. Any report writing will be done on Saturday or Sunday. We plan to complete the project requirement by working together not just on a schedule meeting time but throughout the entire semester. If any member of the group is having trouble with a particle problem we can come together very quickly and attack the problem as a group. Similarly, if any one member of the group is not fulfilling his duties, we can confront the problem as a group. If it turns out that that approach did not work then a professor may be contacted. Some of the keys to being successful in the project are the division of labor, collaboration, and persistence. We, as a group, will be more than capable of working together and getting along. If we meet for every scheduled meeting and work diligently during that time, we will be able to complete the assignment each time.

  • \'\'\'Technical Expert\'\'\' - \'\'Brad Anderson\'\' – The technical expert is responsible for making sure the product is dissected properly.
    • Makes sure the proper tool is used throughout the dissection process and is the man to come to with any regarding technical questions.
    • Has the most experience working with his hands and knows the most about simple tool usage.
  • \'\'\'Project Manager\'\'\' – \'\'Nick Kier\'\' – The project manager is responsible for making sure the entire group comes together for meetings.
    • Is the main coordinator of the group and sets up all impromptu meetings and reminds all the members of the scheduled meetings.
  • \'\'\'Communication Liaison\'\'\' – \'\'Russell Pernal\'\' – The communication liaison is the main line communication with the professors.
    • Is responsible for any emails sent to the professors. This way any questions asked can be consolidated in one email or one conversation.
  • \'\'\'Documentation Specialist\'\'\' –\'\'Ryan Brion\'\' – The main responsible of the scribe is to write down everything.
    • Will be making the notes on our observations and discoveries during product dissection.
    • Is also responsible for getting his notes to the rest of the group, so the rest of the group can have access to the notes.
  • \'\'\'Wiki Expert\'\'\' –\'\'Adam Chamberlain\'\' – The wiki expert is responsible for anything that goes on the wiki and anything that needs to be submitted to the professors.
    • Is responsible for putting it all together, revising it, and submitting it.

Product Archaeology

Development Profile

  • Developed in July 1988 [1]
    • At this time, a gallon of gasoline cost $1.08 [2] which meant that the cost of gasoline wasn\'t a huge factor. Also the chainsaw doesn\'t use much gasoline so gas usage wouldn\'t be a huge concern anyways.
    • Had to be affordable
    • Had to be able to start and run in various weather conditions
  • Produced and intended for sale in the United States
  • Intended to provide an easier way to cut wood than by hand

Usage Profile

The Eager Beaver is a small chainsaw compared to other models. It is intended to be used to cut tree branches and other wood. Since it is a small model, it is for home use instead of professional. This product can be used by homeowners who need to perform maintenance on their property including tree branch removal and tree shaping.

Energy Profile

To accomplish its job this chainsaw uses chemical energy, potential energy from pressure, shaft energy, internal energy. The purpose of the chainsaw is to convert the chemical energy of the gasoline into mechanical shaft energy to move a chain. The energy is originally imported into the system by pouring petrol into the gas tank which has high chemical energy. The chemical energy is then converted into work from pressure, which is turned into shaft work. This shaft work then rotates the chain which utilizes wedges and its kinetic energy to cut wood.

Complexity Profile

The different components of the chainsaw include: carburetor, gas/oil tank, engine, chain, chain oiler, throttle, brake, starter. The engine is a combustion engine and is quite complex. It involves many moving parts and many processes. The figure below outlines the components and their respective jobs.

\'\'\'Table 2: Subsystems and their Jobs\'\'\'

\'\'\'Component\'\'\' \'\'\'Job\'\'\'
Carburetor Mix gas/oil with air and deliver mixture to engine.
Gas/Oil Tank Store gas/oil mixture and oil.
Engine Combust fuel mixture to convert chemical energy to shaft energy.
Chain Use the shaft energy and wedges to cut wood.
Chain Oiler Uses manual pump to keep chain oiled to lubricate and prevent rust.
Throttle Control volume of gas into engine.
Brake Connect/Disconnect chain from engine
Starter Provide the initial engine spin, create vacuum to pull gas into engine

Material Profile

Before dissecting the chainsaw, we made a list of materials that the chainsaw was made of. Though some materials are not visible, we inferred their makeup by analyzing the subsystems within the chainsaw. The material list is displayed below.
\'\'\'Visible Materials\'\'\'

  • Plastic
  • Aluminum
  • Steel
  • Nylon

\'\'\'Non-Visible Assumed Materials\'\'\'

  • Fuel
  • Oil
  • Copper
  • Rubber
  • Iron

User Interaction Profile

  • There are many interactions that the user must undergo to operate this chainsaw. The user unscrews the fuel cap mixes the oil and gas to fuel the chainsaw. There also is another input for just oil which keeps the chain oiled. The activation for the oil drip is a switch by the handle. To start the chainsaw, the user must switch on the engine, depress the trigger, and pull the ripcord. To disengage the chain brake, there is a lever that the user must hit. Once the chainsaw is started the user must pull the safety button then the throttle. Depending on the weather conditions, the choke must be manipulated for optimal fuel air mixture.

Product Alternative Profile

  • \'\'\'Alternative Products\'\'\':
Table 3: Product Alternatives
Alternative Advantages Disadvantages
Axe • Cheaper
• More Portable
• Simple
• No Fuel Needed
• Can Be Used in Any Conditions
• More Effort to Use
• Less Powerful
• Takes Longer to Cut
Handsaw • Cheaper
• Lighter
• More Portable
• Simple
• No Fuel Needed
• Can Be Used in Any Conditions
• More Effort to Use
• Less Powerful
• Able to Cut Through Less
• Takes Longer to Cut
Specialty Chainsaw (Alligator Lopper) • No Fuel Needed
• Good For Specialized Tasks
• Lighter
• Limited use
• More Expensive
• Electricity Source Needed