Parallelism question verification
Parallelism question verification
(OP)
So please view the section drawing of a round disk with a raised portion in the center. Hopefully it is semi clear?
[ // | .01]
|
v
____________+++++++++++_______________
| |
|______________________________________|
.
/|\
|
[A]
So if the + signs have to be parallel to .01 of datum A then
if using a CMM then the reference length should be the length of the + signs. Is this a correct assumption? The reference length should NOT be the length of the bottom of the part
[ // | .01]
|
v
____________+++++++++++_______________
| |
|______________________________________|
.
/|\
|
[A]
So if the + signs have to be parallel to .01 of datum A then
if using a CMM then the reference length should be the length of the + signs. Is this a correct assumption? The reference length should NOT be the length of the bottom of the part





RE: Parallelism question verification
Powerhound
Production Supervisor
Inventor 11
Mastercam X
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Parallelism question verification
Set up on datum A using a 3 point set up. If datum targets are shown - great but if they aren't not, just note where you picked up your points. You have created a plane.
Now contact the surface that has a parallelism tolerance of .010. Take multiple points and the range of the points must not exceed .010.
Parellelism includes angle and flatness combined.
Dave D.
RE: Parallelism question verification
It seems as though you are using paralellism line-to-line. I'd think plane-to-plane is more appropriate.