True Position of a circle

dear all,

I am new guy for PCDMIS, currently I am using PC-DMIS rev 4.3 and 2012.
recently, I found a problem with a program for my product. it is about a true position of a circle, please refer to attached photo for details.
a circle which is labelled as CHAR7, the true position result is 0.0035in rather than 0 when i just use CAD model(not a physical part) to run this program.

Appreciate if you can give me advise.

Thank you
Robin Wu

Attached Files

KIRBSTER269 over 6 years ago

Is that callout marked or unmarked? I noticed it's green, Is that the color you have it set up at. Maybe run that against an actual part and see if that dimension changes. If not you might want to put your cursor on it and hit F3
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RobinWu over 6 years ago

Hi kirbster269,

the color in green is what I set up at. When I run on a actual part,the result is changed.

However, the problem is still there, why the TP result is not 0 if I run progam on CAD.

Thank you
Robin
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KIRBSTER269 over 6 years ago

Can you post your alignment, your code
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RobinWu over 6 years ago

Can you post your alignment, your code

Hi kirbster269,

after execute the entire code, the problem is solved(the TP is appeared as "0"). So, i think you are right, the problem is caused by unmarked of the alignment. Thank you very much.

Regards
Robin
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VinniUSMC over 6 years ago

Does the print specify nominals? Is CAD or print called as master? It's entirely possible that the CAD is different because of rounding errors, or engineering screw up, or revisions, or who knows what.
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KIRBSTER269 over 6 years ago in reply to VinniUSMC

The world may never know.
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NinjaBadger over 6 years ago

A few observations.

1) That's a legacy TP dimension. You're specifying datums with Fit to Datums switched on. This could have an impact (i.e. incorrect theo's in the alignment features)

2) You have non alpha-numeric characters in your feature and/or dimension names CHAR 73-1 etc, also if you look at the text in the dimension it says 'PLANE [weird symbols] AT RFS' this is almost certainly that it doesn't like your feature ID.

LETTERS_NUMBERS_AND_UNDERSCORES_ONLY For feature and dimension ID's.
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RobinWu over 6 years ago in reply to VinniUSMC

the CAD is correct. the problem is caused by alignment issue.
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RobinWu over 6 years ago in reply to NinjaBadger

Thank you NinjaBadger, I did not run the entire code before, so that the incorrect actual in the alignment may cause the TP is not report as "0".
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NinjaBadger over 6 years ago in reply to NinjaBadger

Hi Robin,

I saw that you had a 'solution' but but that may just be a happy coincidence.

I strongly recommend you rename features and dimensions using letters numbers and underscores only. the fact that the text in the dimension on the datum line PLANE [weird stuff] -A- AT RFS is scrambled should be enough to let you know that fixing this is important.

I once saw a program for checking a ring gauge which was giving a 0.016mm error. The only issue with he program was a decimal point in the feature name. We changed this back to CIR1 and it reported correctly.

Ignore this advise at your own risk.
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