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Alignment Question

Lukas
Hello. I am trying to better understand how alignments work. For example the advantages of doing multiple alignments vs one single alignment, rotating before translating, etc.

If you don't rotate before you translate, then what XY values does the software use for translation? Does it take the XY values from the alignment the feature was measured in?

Sorry, this question is a bit hard to convey. See, a while back I had a program that gave me different profile results if I translated before I rotated and I'm trying to understand the theory of why.
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  • Hello. I am trying to better understand how alignments work. For example the advantages of doing multiple alignments vs one single alignment, rotating before translating, etc.

    If you don't rotate before you translate, then what XY values does the software use for translation? Does it take the XY values from the alignment the feature was measured in?

    Sorry, this question is a bit hard to convey. See, a while back I had a program that gave me different profile results if I translated before I rotated and I'm trying to understand the theory of why.

    I did have same concern on previous thread

    https://www.pcdmisforum.com/forum/pc-dmis-enterprise-metrology-software/pc-dmis-for-cmms/535862-2-readpoint-start-issue

    Since lots of our programs use 2 readpoints to start, most programs transfer to Datum B ( one of readpoint) first, then rotate from point C to point B, plus some angles offset if needed.

    This is a first alignment for the program, after get the datum A , datum B, Datum C , then program will follow level rotate and transfer ....
  • in reply to RobOntario
    See my post after you, maybe it will help...However, I think your issue is different. I had the same issue as you recently with a LARGE part that I couldn't square up to the CMM axes. My program kept crashing, unless I did three alignments like this: Measure plane -> Level, Measure line -> Recall A1 & Rotate, measure Origin -> Recall A2 & Translate. If I didn't break up the alignments, it kept crashing. I wish I had a better understanding of alignments. Its just hard to wrap my head around.
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  • in reply to RobOntario
    See my post after you, maybe it will help...However, I think your issue is different. I had the same issue as you recently with a LARGE part that I couldn't square up to the CMM axes. My program kept crashing, unless I did three alignments like this: Measure plane -> Level, Measure line -> Recall A1 & Rotate, measure Origin -> Recall A2 & Translate. If I didn't break up the alignments, it kept crashing. I wish I had a better understanding of alignments. Its just hard to wrap my head around.
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