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shakes head sadly and begins to amble off into the sunset. . . .
3
pauses. . .
realizes it isn't even noon yet. . .
wipes a single tear from a wizened cheek and resumes ambling. . .
and muttering indistinctly. . .
[ Which is NOT the same as what I thought you were saying previously, that you secure the Datum Feature to the plate and then probe the OPPOSITE side of the part from the Datum Feature and use CAD nominals to Offset that to create the Datum. That is WRONG.
That's not what I suggested, Wes. Please re-read it, and give me an updated assessment
Some of the parts we produce are long or thin and fairly flexible; they frequently need to be secured to a block or table to restrain them. This usually makes the primary datum inaccessible.
To achieve the same end, can I program using the actual model surface, then pick up the mating surface when the part is measured? What modifications have to be made in the alignment to do this?
it's not uncommon, but is also less than desirable, for the plate is not the actual datum. From a micron's perspective, that datum doesn't lay flat against the surface plate -- there are high points of contact that it is resting, due to it's deviation from perfect form. So no matter how you spin it -- it's not the same surface as the datum.
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