Week 10: Tolerance Analysis, Part 2

"Measurement is the first step that leads to control and eventually to improvement. If you can’t measure something, you can’t understand it. If you can’t understand it, you can’t control it. If you can’t control it, you can’t improve it." - H. James Harrington

Week 10 Summary

For Week 10 of the HPS program, the participants were required to do more tolerance analysis. The main difference between the analysis done last week and this week would be that instead of solving for the worst case, the participants would be solving for the root sum square (RSS) case. While the former case is used to get a sense of the very worst cases of tolerance allowances, the RSS case can be used to get a sense of the two-sigma (in this case) boundary, which would ensure that at least 95% of the parts made would fall within the bounds specified.


Example of dimensions for tolerance analysis of a gap.

Tolerance Root Sum Square Examples

Below are the same three cases as in the prior week. Please click on each picture of the tolerance case to see the associated tables.


Tolerance Analysis Case #1
Rear gap between circuit cover and back cover.


Tolerance Analysis Case #2
Bottom screw setup for front/back covers and bottom case.


Tolerance Analysis Case #3
Gap between AIY speaker and upper case for the rubber sheet.

Google HPS Product Representation

All of what is depicted is representative of the work one would expect from the Google Hardware Product Sprint Program. All educational content depicted belongs to Google.

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