True Position w/MMC evaluation help

I'm fairly new to QUINDOS and have just finished getting all the measurements of a part.

I need the true position from the center of a bore (X0,Y0), to a counterbore on the part. (X 9mm, Y 32mm)
I did a ScanOnCircle for the bore and the C'bore, then MECIR and got the DM, X and Y.

The top of the part is datum A, the center of 2 bores are datum B and C with a True position of 0.2(M) | A | B(M) | C(M) | with tolerances on the diameter of the bore (+.016/-0) and the counterbore (+0.22,-0)
The POSITN command puts a very high value when evaluated, and I'm not sure where I should be putting all the tolerances.

Any help would be appreciated!

swojciechowski over 3 years ago

we can help out more if you post sample/current code. The POSITN command requires a specific syntax for the datum components.
Prior to executing the POSITN command, in order to take advance of the MMC on the datums, the datums have to be evaluated for DM and the correct nominal and tolerance entered....i.e back in the MECIR of the datums.

feel free to contact me; Steven.Wojciechowski@Hexagon.com
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bookworm over 3 years ago

Hello,

The top of the part is datum A, the center of 2 bores are datum B and C with a True position of 0.2(M) | A | B(M) | C(M) | with tolerances on the diameter of the bore (+.016/-0) and the counterbore (+0.22,-0)
The POSITN command puts a very high value when evaluated, and I'm not sure where I should be putting all the tolerances.

I would suggest to build new coordinate system and use POSITNXY (as long as you wrote X & Y).

Then, in evaluation window, you need to use POSMMC (just in case you miss it), and, of course, as Steven already mentioned, you need datum circles evaluated properly for the MMC part.
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