Tolerance actual feature or cast

[dwade]

Tolerancing a feature for true position and I'd like to know which is the better method to use. I use 2 studs in the alignment and have toleranced a cast diameter for one of the studs. Is it better tolerance the actual feature after the alignment or tolerance a cast diameter of that stud?

Other software that I have used you would have to recall that feature but I have seen that I do not have to do that in PC-DMIS. You get the same results but am wondering if it'll bite me in butt later.

[inspector212]

Why are you creating a cast dia for the studs? I would use the actual.

[John Riggins]

Tolerancing a feature for true position and I'd like to know which is the better method to use. I use 2 studs in the alignment and have toleranced a cast diameter for one of the studs. Is it better tolerance the actual feature after the alignment or tolerance a cast diameter of that stud?

Other software that I have used you would have to recall that feature but I have seen that I do not have to do that in PC-DMIS. You get the same results but am wondering if it'll bite me in butt later.

If I understand your question correctly...You are asking if you can dimension a feature that you measured as part of an alignment.
Short answer is yes.
If that feature was measured manually, it is best to measure it again as a DCC feature and then dimension it. Manual measurements are not as accurate as DCC measured features.

[spazus_maximus]

As long as your not using the new alignment for a perfect approach vector on your studs it shouldnt matter where you call out the diameter.....

[dwade]

Studs are measured as part of the initial alignment all being perp to the initial planar alignment. Like I said in the 1st post, some of the other software that I have used you had to recall that feature to tolerance it after making your part alignment.

Thanks for the info.

Duane