Checking Profile Tolerance on CMM's

A

ARMSI-1

#1
We are having a discussion on the "best way " to check Profile of a surface tolerance on CMM's ( Zeiss UMESS-UX). Since there is no direct software callout, I previously have used Surface to Surface runout callout using half of the stated profile tolerance. My partner was using parallelism. Is anyone had similar experiences? Or proven different methods
?
Thanks::bonk:
 
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P

Phil Fields

#2
I am not sure of the correct answer, but I would contact Don Day at Tec-Ease (Fredonia, NY).

I am not affiliated with Tec-Ease, but have had training by Don years ago, he is very knowledgeable in the GD+T arena.

Phil
 
T

True Position

#3
If it's a flat surface say the bottom ground surface of a part to the top surface, I use parallellism error + the cartesian distance error from nominal.

Ex. You have two planes like the = sign. It can be wrong in two ways, the measured surface could not be parallel to the bottom one (the TIR you'd get with a surface plate and dial indicator) as well as out of position between the two planes.
 

Kingsld1

Involved In Discussions
#5
Why not use simple +/- xyz location? In my experience, most profile callouts are long-winded conventional dimensions with datums attached to lock in your alignment. Even on profile without datums you are still looking for a maximum deviation from a theoretical surface. :2cents:
 
T

True Position

#6
I'll agree here, my example is only for the simplest of cases. A section of the drawing in question would help.
 
A

ARMSI-1

#7
Can't show the drawing, due to, well you know, G-work. Basically its a 30" by 30" plate with 60 6" posts in the +Z direction that the top surfaces have a profile of .005. We came to the conculsion that max-min plane seems to give the best results. Thanks for the replies!!!!!!:thanx:
 

Stijloor

Staff member
Super Moderator
#8
Can't show the drawing, due to, well you know, G-work. Basically its a 30" by 30" plate with 60 6" posts in the +Z direction that the top surfaces have a profile of .005. We came to the conculsion that max-min plane seems to give the best results. Thanks for the replies!!!!!!:thanx:
Looks like a profile of a surface used to control to coplanarity. When the primary datum is the bottom surface of that plate, it will control the "parallellism" of the 60 6" posts, including flatness, and the relationship of all these surfaces relative to each other. Look at the Y14.5 standard on pages 171-172.

Stijloor.
 
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