Exactly How does it work

[scqulaity]

We have a part that has a true postion call out on a cyl to another cyl. Our other quality guy thinks concentricity would also report a "good" part. I on the other hand find that calling out the true position as it is on the print shows that the part is correct. The concentricity is off. Can someone give me some more info on exactly how the math is done for both measurments on PC-DMIS?

[Mike N.]

definitions of calculations in pcdmis

check out this .pdf I got from tech sup a while ago

I hope this helps

Mike

[tking]

check out this .pdf I got from tech sup a while ago

I hope this helps

Mike

Another one printed and stashed!

Thanks, Mike,

TK

[rebeldude]

Very good information once again Mike. Thanks!

[kbotta]

1 word of advice, that concentricity deffinition is not ASME Y14.5M-1994 compliant.
Kb

[PixleyRichards]

You probably all have this, but there is a little booklet that goes over all the math and fun stuff like that. "Geometric Dimenstion and Tolerancing" its pretty helpful when it comes to reading and trying to understand drawings. The website is www.geotol.com .

[rebeldude]

Kevin, you you get us all a print out of that ASME compliance?

[kbotta]

It's in the standard (14.5) Under the chapter about tolerances of location. Starts on pg 144 (5.12)
You can search the word concentricity and find out more. I think I went into detail a few months ago. What pcdmis is giving is coaxiality. Something entierly different than concentricity. There is no way Pcdmis can have a macro built in to check this, with out going into GREAT effort.
Kevin