Composite Positional Tolerances
Composite Positional Tolerances
(OP)
I have 4 linear counterbored holes with threads, for cam followers.
4X <DIA>.438 <DEEP>.480
7/16-20 UNF-2B THRU
Can I apply composite positional tolerancing to the entire callout, or do I have to apply to the counter bore and threads separately?
4X <DIA>.438 <DEEP>.480
7/16-20 UNF-2B THRU
Can I apply composite positional tolerancing to the entire callout, or do I have to apply to the counter bore and threads separately?
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RE: Composite Positional Tolerances
As per page 137 fig. 5-37 in the standard, you can apply a positonal tolerance on both the hole(s) and the counter bore(s) together. Make sure that the 4X hole size and then the counter bore size with depth are above the feature control frame.
In that same thought then, one may have a composite feature control frame covering both or one can separate them as per fig. 5-38.
Hope this helps.
Dave D.
www.qmsi.ca
RE: Composite Positional Tolerances
"Art without engineering is dreaming; Engineering without art is calculating."
Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of Eng-Tips Forums?