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How do you calculate position with angled datums?

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2 questions for measuring the 2x .5247 +.0007/-.0000 holes to datums D-A-B
*The holes are NOT inline with Datum -B-

#1 how does PC-DMIS calculate where the Datum origin is calculated from?

#2 how would you duplicate this manually with height gage and rock?



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  • So here is the part loaded against the primary datum "D" (clamped to the left block) and against the secondary datum "A" (loaded against angle plate in rear) Then I have a 1-2-3 block resting on tertiary datum "B".
    Notice the measurement on the height gage. I was worried about my measurement, because if the corner has an edge break on it, it wont be to the theoretical sharp corner.

    Hopefully this makes more sense?






    This pic shows where the demon is measuring datum "B" from.





    Why such a big difference?
Reply
  • So here is the part loaded against the primary datum "D" (clamped to the left block) and against the secondary datum "A" (loaded against angle plate in rear) Then I have a 1-2-3 block resting on tertiary datum "B".
    Notice the measurement on the height gage. I was worried about my measurement, because if the corner has an edge break on it, it wont be to the theoretical sharp corner.

    Hopefully this makes more sense?






    This pic shows where the demon is measuring datum "B" from.





    Why such a big difference?
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