Flatness Implication
Flatness Implication
(OP)
I have a steel shim cut to a certain shape.
It is symmetrical, so it can be flipped over and used that way.
The engineer wants me to put a flatness spec on the bottom face (ok, fine) . . . and he also wants me to make the bottom face datum A and add a parallelism (to datum A) spec to the top face.
How can I explain to him that the flatness spec on the bottom face is all that is needed, and it will apply to both the top and bottom faces?
Is this in a standard someplace? I rememeber reading it, but that was over 20 years ago. He needs more than just my word on this.
It is symmetrical, so it can be flipped over and used that way.
The engineer wants me to put a flatness spec on the bottom face (ok, fine) . . . and he also wants me to make the bottom face datum A and add a parallelism (to datum A) spec to the top face.
How can I explain to him that the flatness spec on the bottom face is all that is needed, and it will apply to both the top and bottom faces?
Is this in a standard someplace? I rememeber reading it, but that was over 20 years ago. He needs more than just my word on this.





RE: Flatness Implication
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Flatness Implication
No, the flatness applied to the bottom face of the part only (without any additional notations) does not apply to the top face. Flatness of the top face would be controlled by size dimension (acc. to Rule #1).
RE: Flatness Implication
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Flatness Implication
Does that make a difference ?
RE: Flatness Implication
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Flatness Implication
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Flatness Implication
RE: Flatness Implication
RE: Flatness Implication
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II