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Zero Positional Tolerance Question
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Posted by: Gammons

05/29/2003, 19:26:06

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Please help me if you can...

We make step reamers (ground between centers) and a customer's print allows +.0002"/-.0000 on two diameters, and also calls out for 0.0 positional tolerance.  As I understand this, it means that if we make the tools on the high ends of the diameter tolerances, we get .0004" total TIR, and if we are on the low ends, we are allowed 0 TIR.

Here is the problem, the tightest we can hold on diameters and concentricity is +.0001/-.0000 and this is time-consuming and costly.  I have never seen a positional tolerance callout on a reamer print before, but it really looks unreasonable to me, because it seems that the dimensions gang up...



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