Tech Question on Machine Shops: Tight Tolerances

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October 21, 2020

by a searcher in Florida, USA

How good is +/- 0.0002” as a tolerance level? Seems very precise to me. Thanks!

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Reply by a searcher
from Harvard University in Fort Wayne, IN, USA
Agree on above. 100% depends on what industry/products you’re working with.

Recommend you call 2-3 of their competitions and ask what their tolerance is on their products / machines. They will overstate it by a bit, but it will give you a good idea of what ballpark you need to be in.
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Reply by an intermediary
from Naval Postgraduate School in Bellevue, WA, USA
Be careful. Typical measurement tools cannot measure to that level. For reference purposes a human hair is typically about 0.002”. Production CNC machine tools cannot machine parts to that your quoted tolerance. Further, the market for such parts would be limited.
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