Counterbore control 1

[ewh]

(a tangent continuation of thread1103-197198)

For a counterbored hole feature with a positional control FCF, is the base (flat) surface of the counterbore controlled by the FCF?
We are attempting to get our MBD definitions in line with what a CMM can consume. A CMM vendor has told use that the bottom of the counterbore is not considered a controlled surface relative to the FCF.
TIA!

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[tim_member]

Flat surface of the counterbore is not a feature of size, therefore position FCF can't be even considered applicable to this kind of feature.

 

[chez311]

tim_member beat me to it. ASME does not allow application of a position control to a non FOS planar feature (ie: the flat bottom of a counterbored hole), so my answer would be no.

Obviously a depth can be specified next to the diameter dimension, however it would be separate from the position control.

 

[ewh]

Thanks! I should have realized that!
We'll have to dimension the depth separately instead of relying on the feature definition provided by NX.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[pylfrm]

ewh,

What's a CMC?


pylfrm

 

[ewh]

Typo, corrected to CMM (Coordinate Measuring Machine)

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV