Group 11 - Dual Stage Snow Thrower (Gasoline Powered) - Gate 4
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In this stage, we reassemble the machine,
In this stage, we reassemble the machine, the crucial mechanism, and propose some possible design revisions to the machine.
==Final Critical Review==
==Final Critical Review==
Revision as of 17:40, 30 November 2012
In this stage, we reassemble the machine, detail our reassembly process and speculate about the original assembly process, examine a crucial mechanism, and propose some possible design revisions to the machine.
Final Critical Review
Only two of us were familiar with each other before the project, so our roles and strengths weren't apparent. All that was required to address this was time to chat, and introduce each other.
We had and still have a habit of laying things to the side until the last day. We addressed that by constantly reminding each other to put their part up before hand, to minimize the last minute additions.
Only one person had direct experience in Manufacturing. Only one person had current experience with CAD modeling. Only one person had a clear idea of the workings of the machine. We split up along our individual strengths, and fully investigated the subsystems of the machine to learn about it.
A number of times, we were out of touch with each other, and couldn't call each other. We utilized Facebook as a means of talking, by leaving messages the other group members would later read and answer to. Additionally, because three of our group members are from foreign countries, the other two needed to proofread the work before posting it.
We were not able to fully disassemble the machine with the tools on hand. We chose not to attempt it due to not knowing the proper procedure or to avoid damaging the components. Whatever was readily accessible, we removed it so we could examine the immobile parts.
1. Spur gear: It is the simplest type of gear. It consists of a cylinder with the teeth projecting radially, and although they are not straight-sided in form, the edge of each tooth is straight and aligned parallel to the axis of rotation. The single spur gear is used to make the whole gear system more stable.
Number of teeth=13
Face width= 18 mm
Diameter of outside circle= 35 mm
2. Bevel Gear: It is specifically a crown gear. A crown gear is a particular form of bevel gear whose teeth project at right angles to the plane of the wheel; in their orientation the teeth resemble the points on a crown. This crown gear is meshing with spur gears. Then the crown gear interacts with the two spur gears.
Number of teeth = 26
3. Worm Gear: A worm gear is sharing the same axle with the spur gear; the spur gear rotates with the bevel gear and rotates the worm gear. They have the same angle velocity. The worm gear motivates the discharge chute to direct the snow's outlet.
Possible Design Revisions
(Note: As previously stated, the title is misleading. The Toro CCR-2000 is a single-stage blower.)
1: Wider intake scoop. This would require a longer auger, a wider upper shroud, and a smaller reduction ratio on the pulley.
Global factors: The blower would be able to handle more snow at a time.
Societal factors: Its improved capacity means it takes even less time and effort to clear the same area. That is less time for the operator to spend outside in the freezing cold.
Economic factors: By having to go back and forth less times while running the engine, this revision saves time, money, fuel, and maintenance needs, making the machine pay for itself sooner.
Environmental factors: Less time spent in operation means less overall pollution from the combustion engine.
2: Add an icebreaker auger, making it a dual-stage. The second auger will be larger, but will rotate much more slowly. It will also be made of steel, with blades to loosen up the snow and break apart ice. It will require a more powerful engine, an additional axle and pulley system, and a metal intake shroud to efficiently support the weight.
Global factors: The blower will become a heavy duty machine instead of a light duty one.
Societal factors: This revision would make the blower ideal for areas with heavy snowfall or icing problems.
Economic factors: It will be more expensive in materials and fuel, since there would be a good amount of metal to be machined and added to the blower. Metal is much more expensive than ABS plastic, and the extra weight would tax the engine more.
Environmental factors: Because of the need for a more powerful engine, it will burn more fuel at a time. However, it will burn less overall compared to using a light duty machine for heavy duty work.
3: Change to a 2-cylinder engine. This may require an enlarged chassis and a larger capacity fuel tank.
Global factors: The blower would be capable of operating faster and more consistently. It would also be capable of dealing with heavier loads, though not as heavy as a Dual-Stage blower.
Societal factors: A more powerful engine keeps the operator warmer and completes the job faster. Some users also like to show off or brag about a more powerful engine.
Economic factors: The machine will cost more, and use more fuel at a time.
Environmental factors: A 2-cylinder engine burns more fuel at a time than a single-cylinder engine. This revision will increase pollution from exhaust gases.
1: Simple and quick. One person could do it in 5 minutes at most.
2: Complicated or tedious. The step is a little tricky or takes a long time.
3: Complicated and tedious. Two people are required for the task and the process takes time to complete.