Customer designs utilizing Zero blanks usually designate the manufacturing tolerances of the finish-grind dimensions. When these tolerances are not shown, or if Zero Gage is doing the design, the generally accepted practice is to use 10% or less of the part tolerance for manufacturing. This manufacturing tolerance is usually divided equally between the set dimensions to control the linear movement of the gage pin. Tolerances will be directed toward mean with a plus or minus sign. Use of this method assures that the gage will not accept an out-of-tolerance part.

DEPTHS: EXAMPLES 1 and 2 are typical set-up dimensions, where 10% of the part tolerance is split between range and step (note that the GAGE RANGE tolerance has been subtracted from the step dimensions, and that the step always has a minus tolerance). EXAMPLE 3 is an exception to the standard practice of equally splitting tolerances because a long pin is used. This allows minimum cost of altering the blank.

No. 3
7.130
7.140
Part Depth