True Positioning

By Mikeqc1 (****)

Date 11-16-2011 23:35

How would you all apply true position on a Bolt pattern?
Would you apply it to the individual bolt hole, or apply it to the bolt hole Dia of all 6?
The tolerance is .058 , id worry that if 2 holes are within tolerance but in opposite directions there may be fit up issues.
Any comments on application of true position for circular bolt patterns?

By raptor34 (**)

Date 11-19-2011 12:51

I dont think you would have any fit up issues at all, the studs are usually 1/8" smaller that the holes, so .058" even in opposite directions would be close, but should not cause fit up issues.

By Mikeqc1 (****)

Date 11-19-2011 13:13

yes im confident that its ok true position tolerance is .058. and the bolts are approx 1/8 smaller.
its just that the tolerance of true pos being .058 if they were in opposite directions position is ok but the bolt circle would be out.
so i applied true position to the bolt circle, not each individuaL hole.
the BC is .007 off center, and thats great.

By R McLead (**)

Date 11-30-2011 03:09

Mikeqc1

I will try and attach a PDF of the way I understand and have seen true position used in locating bolt circle

Rey

Attachment: bc.pdf - Bolt Circle and true position (13k)