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The tolerance of the pitch diameter is ±0.138 mm.
The standard defines tolerance of the crest truncation 0.0034 in = 0,086 mm.
There is a minimum truncation 0,0029 in = 0,074 mm.
Therefore
Minor diameter Tolerance = PD_Tolerance + 2*Trunc. tolerance = 0,448 mm
Min. Minor diameter = Min.PD_E1 - H + 2*Min.trunc. =
= 1.57795-0.07531+2*0.0029 =
= 1.50844 in = 38.314 mm
Max. Minor diameter = 38.762 mm
Your Minor diameter 38,31mm is equal to the Min. Minor diameter and is correct.
The standard defines tolerance of the crest truncation 0.0034 in = 0,086 mm.
There is a minimum truncation 0,0029 in = 0,074 mm.
Therefore
Minor diameter Tolerance = PD_Tolerance + 2*Trunc. tolerance = 0,448 mm
Min. Minor diameter = Min.PD_E1 - H + 2*Min.trunc. =
= 1.57795-0.07531+2*0.0029 =
= 1.50844 in = 38.314 mm
Max. Minor diameter = 38.762 mm
Your Minor diameter 38,31mm is equal to the Min. Minor diameter and is correct.


