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FIT TO DATUMS.... means if you have MMC on your datums, PCDMIS will 'shift, translate, rotate' your coordinate system using the BONUS on the datums to get the best possible True Position result. PCDMIS 3.7 does this by default. Using this option, it is possible to get a 0.000 True Position frequently, as it reduces the BONUS to improve the TP.
If you uncheck FIT TO DATUMS, then the coordinate system stays where it is (i.e. the true CENTERS of the datum holes don't move) and you get a True Position value, with a TOTAL available bonus.
The latter is what 99% of the industry is looking for.
Stu
FIT TO DATUMS.... means if you have MMC on your datums, PCDMIS will 'shift, translate, rotate' your coordinate system using the BONUS on the datums to get the best possible True Position result. PCDMIS 3.7 does this by default. Using this option, it is possible to get a 0.000 True Position frequently, as it reduces the BONUS to improve the TP.
If you uncheck FIT TO DATUMS, then the coordinate system stays where it is (i.e. the true CENTERS of the datum holes don't move) and you get a True Position value, with a TOTAL available bonus.
The latter is what 99% of the industry is looking for.
Stu
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