Group 32 - Chainsaw
(→Gate 3: Coordination Review)
(→Gate 4: Critical Design Review)
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==Gate 4: Critical Design Review==
==Gate 4: Critical Design Review==
Revision as of 03:18, 16 December 2009
Cam Borowiec - Project Leader
Andrew Koonce - Wiki Expert
Scott Chown - Communications Liason
Matt Lang - Solid Modeling Expert
Gagan Reddy - Dissection Leader
Group Member Pros/Cons
|Matt Lang||-5 Years of CAD Experience
-Works Well in Groups
|-Little Understanding of Engines
-Poor Public Speaking
|Andrew Koonce||-Knowledge of Engines
-Good With Computers
|-Poor Public Speaking
|Cam Borowiec||-Good Public Speaking
-Natural Leadership Skills
|Scott Chown||-Good Communication Skills
-Good With Computers
|-Lacks Dissection Knowledge|
|Gagan Reddy||-Prior Dissection Experience
-Knowledge of Engines
Gate 1: Request for a Proposal
Gate 1 can be found here.
This Includes our work proposal, management proposal, Gantt Chart, and Initial Product Assessment.
Gate 2: Preliminary Project Review
Gate 2 can be found here.
This includes any causes for corrective action, an analysis of the disassembly, and a step by step process of the disassembly.
Gate 3: Coordination Review
Gate 3 can be found here.
This includes a component summary, some suggested design revisions, solid modeling of a main system, and an analysis of engine seizure.
Gate 4: Critical Design Review
Gate 4 can be found [Group_32_Gate_4 |here]].
This includes a step by step reassembly process, and a final assessment of the chainsaw.
|Step||Tool Used||Part Removed||Location on Product||Time it Took||Ease Rating 1-5||Directions|
|1||None||Crank Shaft, Piston, and Rod||Inside Crank Casing and Protruding from Both Sides||30 sec||2||Insert the parts back into the crankcase.|
|2||Vice Grips, 15/16" Crescent Wrench, and Leverage Bar||Clutch Assembly||Attached to Crank Shaft on Opposite Side of Casing From Piston and Rod||5 min||5||Clamp the vice grips to the crank case in a position that will prevent the counter balance to pass it therefore keeping the crank shaft from spinning freely. Put the open end of the crescent wrench in the slots on the clutch and using a leverage bar in the other end of the wrench,twist in the direction opposite of the arrow (reverse threaded) and tighten the clutch on.|
|3||None||Throttle and "Cable"||Inside the handle part of the casing||1 sec||1||Set the trigger onto shaft according to the picture.|
|4||Straight Blade Screw Driver||Left Half of the Casing||Exterior||5 min||2||Screw in all 7 bolts holding the two sides of the casing together.|
|5||Straight Blade Screw Driver||Timing Mechanism||Under the timing mechanism cover||5 sec||2||Bolt the timing mechanism back on. (*Make sure the contact trigger barely makes contact with the sensor to result in the right timing.)|
|6||None||Plastic Holder||Next to Crank Shaft||.5 sec||1||Insert the plastic holder back in it's slot.|
|7||Straight Blade Screw Driver||Battery||Next to Crank Shaft, Under Flywheel||10 sec||2||Screw the battery back in with the two bolts.|
|8||14 mm Crescent Wrench||Cylinder||Surrounding Piston and Rod, Beneath Intake||5 min||3||Bolt the cylinder back on. Make sure the piston ring is compressed and the piston goes in straight. Also, check to make sure the intake port lines up with the casing.|
|9||Straight Blade Screw Driver||Intake||Top, Under Intake Cover||10 sec||2||Slide the intake in, bolt it on, and connect the fuel line.|
|10||Straight Blade Screw Driver||Choke||Connected to Intake||15 sec||3||Insert the tab on the end of the choke onto the intake.|
|11||Straight Blade Screw Driver||Spark Plug Timing Mechanism Cover||Above Timing Mechanism||3 sec||2||Place the cover back on and insert the clip onto the copper shaft.|
|12||14 mm Socket & 1/4" Drive||Fly Wheel||Under Fly Wheel Cover||30 sec||2||Bolt the flywheel back on to the crankshaft.|
|13||Straight Blade Screw Driver||Magneto and Spark Plug Wire||Beside the Fly Wheel||15 sec||3||Bolt the magneto back on. Make sure the magneto is as close to the flywheel as possible, but not touching it. Spin the flywheel a couple times to test the clearance.|
|14||Straight Blade Screw Driver||Exhaust Header||Under Muffler/Exhaust Cover||30 sec||2||Screw the three bolts back on.|
|15||Straight Blade Screw Driver||Muffler/Exhaust Cover||Side, Next to Clutch||30 sec||2||Reattach the exhaust using the three bolts removed.|
|16||crescent wrench||On/Off Switch||Attached to Bottom Cover||5 sec||2||Slide the switch back into the bottom casing, and screw the thin hex nut back on.|
|17||Straight Blade Screw Driver||Bottom Exterior Cover||Bottom||1 min||2||Bolt the cover back on using the four bolts. Leave the lower left (looking at the chainsaw from the user's view) bolt off.|
|18||Straight Blade Screw Driver||Flywheel Cover||Exterior||1 min||2||Bolt the cover back on using 3 bolts.|
|19||Straight Blade Screw Driver||Handle||Exterior||1 min||2||Bolt the handle back on using the four bolts, nuts and washers.|
|20||None||Chain Bar||In between Clutch and Body||1 sec||1||Slide the bar back onto the bolts and the bolt that adjusts the chain tension.|
|21||14 mm Socket & 1/4" Drive||Clutch Cover||Exterior||30 sec||2||Bolt the cover back on with the two washers and nuts.|
|22||Straight Blade Screw Driver||Intake Cover Locking||Underneath Intake Cover||5 sec||2||Attach it using a single bolt.|
|23||Straight Blade Screw Driver||Intake Cover||Exterior||5 sec||2||Place the cover over the intake, push the screw in and turn it 90 degrees.|
The Difficulty Scale is rated accordingly:
- 1 = No tool required
- 2 = One tool required with little force required
- 3 = One tool required with a large force or accuracy required
- 4 = Multiple or specialized tools required with little force required
- 5 = Multiple or specialized tools required with a large force or accuracy required
Does your product run the same as it did before you disassembled it?
The product still does not work. The pull start still gets jammed and slowly recoils, and the engine needs replacement parts in order to be repaired. Also, there is a hole in the crankcase preventing the chainsaw from ever working.
What were the differences between the disassembly and the reassembly processes?
During reassembly the same tools were used, however there is more detailed work required to make the chainsaw work. This includes a miniscule distance between the magneto and the flywheel, The timing of the spark plug must be accurately positioned, and the carberator must be tuned according to the manual. Overall we were able to reassembly the chainsaw with no problems.