The completed yo-yo:
Base Ring Cover
Gears
50 yo-yos:
Specifications
Part
|
Design specification of Critical Dimension
|
Realized
Average of
Critical Dimension
|
Standard
Devation
|
Percentage of Parts
In specification
Limits
|
Comments
|
Large Gear
|
.219
|
0.2189
|
0.001159
|
99.99%
|
Press fit worked perfectly every time, though design specification limits might have been too wide
|
Medium Gear
|
.219
|
0.2186
|
0.001145
|
99.99%
|
Press fit worked perfectly every time, though design specification limits might have been too wide
|
Small Gear
|
.219
|
0.2190
|
0.001214
|
99.99%
|
Press fit worked perfectly every time, though design specification limits might have been too wide
|
Cover
|
1.92
|
1.9387
|
0.01268
|
23.45%
|
While the cover ended up being too large and exceeded the specification limits, it ended up still working in the assembly because the ring still fit around it. We designed the cover such that there was significant clearance between the ring and the cover for the assembly to still fit. Because the only constraint of the cover’s inner diameter was to be bigger than the overall diameter of the gear system, and the cover’s inner diameter was bigger than specified, the cover still fit the gears. Our design specification of mean +/- .01 was probably too strict.
|
Ring
|
2.325
|
2.3212
|
0.003377
|
63.42%
|
The ring ended up shrinking slightly more than expected causing decent amount of the parts to be below the design specification limits. However the base also shrunk more than expected, in the end none of the rings were actually too small.
|
Base
|
2.315
|
2.2909
|
0.004092
|
0.00016%
|
The base shrunk much more than expected causing pretty much all the the base parts to be below the the lower specification limit which was the specified mean -0.005. As mentioned before the the ring also was slightly small. In the end the two parts were still able to press fit together abiet with considerable effort. The design specification for this part where also probably too strict considering the parts still assembled even though none of the parts were within spec
|
Gears - Process capability and run charts
Part
|
Process Capability
|
Large Gear
|
1.437
|
Medium Gear
|
1.452
|
Small Gear
|
1.367
|
Overall, the gears holes had similar process capabilities (Large = 1.437, Medium = 1.452, and Small = 1.367). All dimensions were close and fit within the upper and lower control limits.
Team Mike Presents:
No comments:
Post a Comment