How to place a tolerance like this?

[USG-CY]

We're working with Creo Elements / Pro5.


Can someone explain me how to make a geometric tolerance as shown in the picture below? I've tried and tried.....


View attachment 5529

 

[dr_gallup]

You are not going to get that from the built in Pro/E gtols. I asked for that about 15 years ago, still waiting. You are going to have to fake it with symbols or notes or just go ahead and make a datum and reference it in the gtol.

 

[USG-CY]

I was already afraid of that. Thanks for
your quick respons! Have a nice
weekend.

 

[Roger]

I will restrain myself!


Now, students, one hole is datum A, the other holeis concentric to datum A.

 

[mediumsliced]

I give up, I can't replicate it.

Edited by: mediumsliced

 

[Roger]

mediumsliced:


OF COURSE NOT! It's not a legitamate form!


One hole is datum A, the other hole is concentric to datum A.


If you prefer, you may use true position.
Edited by: Roger

 

[dr_gallup]

Other than the fact that a diameter symbol is always required for concentricity, the shown picture is perfectly valid in both ISO and ANSI. It is perfectly legitimate. Read the specs, they show it. But you can not get Pro/E to make that exact symbol. As Roger said, you have to make one hole the datum and apply the GTOL to the other hole. There are times when the shown type of datum is easier to understand & I have in fact done it in Pro/E but it's more trouble than it's worth.

 

[kdem]

Are you sure about that? I've gone back through the tolerancing specs
I could get access to and they all state or show that there must be a
datum reference in the feature control frame. I could see that what
you're saying might be true for circularity or cylindricity. Is there a
reference or example you can give that shows it. I've seen ISO
standards that are close but nothing that has the form shown.

 

[dr_gallup]

ISO 1101 section 8.3:

If the tolerance frame can be directly connected with the datum feature by a leader line, the datum letter may be omitted.

 

[Roger]

USG-CY & dr_gallup: In doing a search for ISO-1101 I found the standard for 2004. If you look at Appendix A5, page 47 you will see that this practice is "former" and therefore no longer accepted practice.


http://www.scribd.com/doc/57456764/ISO-1101