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Datum Precedence

KyleB
Hi all,

Today's conversation is datum precedence.

Should this be A|C|B and can it be A|B|C? (according to asme y14.5)

My understanding is that it SHOULD be A|C|B and that A|B|C is wrong - but it has now turned into a topic of debate as it cannot be found in the standard.
Parents
  • My 0.02cents..

    Always level, rotate, XYZ in that order.

    Following CAN-MAY-MUST...

    Measure -A- as a cylinder with Z vector
    Measure -B- as a plane with Z vector
    Measure -C- as a cylinder with Z vector

    New alignment recalling startup...
    Level to -A-
    Rotate via offset line constraining -A- to -C- (can't rotate to -B- because it has the same nominal vector as -A-...so... we move on to -C-)
    -A- is X&Y origin, -B- is Z origin
Reply
  • My 0.02cents..

    Always level, rotate, XYZ in that order.

    Following CAN-MAY-MUST...

    Measure -A- as a cylinder with Z vector
    Measure -B- as a plane with Z vector
    Measure -C- as a cylinder with Z vector

    New alignment recalling startup...
    Level to -A-
    Rotate via offset line constraining -A- to -C- (can't rotate to -B- because it has the same nominal vector as -A-...so... we move on to -C-)
    -A- is X&Y origin, -B- is Z origin
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