How to Determine Tolerance of Gage for Part A rule of thumb regarding tolerances on gages is to use 10% of the total manufacturing of piece part for gages, with 1/2 of the 10% to be applied against the GO and 1/2 of the 10% to be applied on the NOGO. View Gagemakers Tolerances Chart TOLERANCE EXAMPLE #1 Part Size = .250 + .002/-.000 GO = .250 NOGO = .252 Total manufacturing tolerance = .002 10% of .002 = .0002 1/2 of .0002 = .0001 Class Z would be recommended. TOLERANCE EXAMPLE #2 Part Size = .250 + .0005/-.0000 GO = .250 NOGO = .2505 Total manufacturing tolerance = .0005 10% of .0005 = .00005 1/2 of .00005 = .000025 Class XX would be recommended.
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