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Parallelism calculation method

Leandre Vienat
Hello

I need to perform a parallelism with external material calculation method how can I do?
I can't find a compute option for parallelism. In the help it seems to me that I found that flatness and parallelism are in Chebyshev.
Can someone give me some clarification on this? PC-DMIS 2019R2 version
Thanks in advance

My best regards

Léandre Vienat
  • "Should" be the same but then you would not be checking the parallelism of the Entire surface; you're picking and choosing. (I assume that you are using Legacy dimensioning.)
    On the other hand, the two surfaces are unlikely to be perfectly flat and you'll come up with a different orientation and result just from that. May not be much, may be a whole lot.

    The overall point I'm trying to make is that one surface is the reference surface and the other is the measured surface. This basically means you are supposed to stand in a particular spot and look in a well defined direction. If you move from the spot or direction then you are going to see things at least slightly different and maybe very differently.
  • in reply to kingsld1
    fair nuff. thanks for the response.
  • When measuring parallelism, why does it matter what plane you select first? shouldn't the parallelism between two planes measure the same no matter what plane is selected first?

    Don't confuse parallelism with angle !!!!!!!
    If you have 2 planes with exactly 180° between vectors, one with a flatness of 0, the other with a flatness of 0.1 mm, if you take the first as a reference (so second select !), you will have a parallelism of 0.1, in the other case a parallelism of 0.
    You can calculate them easily :
    ASSIGN/V1=DOT(PL1.HIT[1..PL1.NUMHITS].XYZ-PL2.XYZ,PL2.IJK)
    ASSIGN/V2=DOT(PL2.HIT[1..PL2.NUMHITS].XYZ-PL1.XYZ,PL1IJK)
    ASSIGN/PARAL1=ABS(MAX(V1)-MIN(V1))...........................parallelism of PL1 from PL2
    ASSIGN/PARAL2=ABS(MAX(V2)-MIN(V2))...........................parallelism of PL2 from PL1
    In addition, the reference plane should be L2 constraint in ASME, minimax in ISO.
  • Absolutely agree that parallelism and angle are two different things. I was trying to apply a simple model for ease in replying to the OP question. "All models have flaws, but some are useful."
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