CATiA GD&T Tutorial #9

[@robingathercole5323]

Hello, I was curious to know how to create the center line with reference to a bolt circle on a rectangular object? In this tutorial you click the outside circle as your reference point. Is there a way to create a circular reference point?

[@md.shahinurrahman747]

Hi! Samson, I have a question about the tolerance selection, why you put the tolerance of the outer diameter manually? I think the software should put the tolerance value automatically based on the diameter. I Don't know is it software bug or not.My concept may be wrong. But according to design perspective, the functionality should do it automatically. I request your comment please what you know. Thanks.

[@xratik_]

Software can't put tolerance value automatically based on the diameter, because Software don't know whether we required clearance fit or transition fit or interference fit. That's why we have to put tolerance value based on our required condition i.e., clearance fit or transition fit or interference fit.

[@alderfek]

@@xratik_ Doesnt that defeat the purpose of dimensioning ? If you change the hole in the model, then you would have to edit the note manually.

[@sandeepkallepalli8948]

what is P .375? Is it Position or Positional tolerance? Please clarify

[@drunkmonk1600]

P is for Projected. The tolerance is projected from the surface that distance to ensure fitment to the other part. Usually the projected distance is the thickness of the interface part/flange.