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Tertiary axis/plane is parallel to primary axis

Calvin.Korver

So I have been having a problem with this part. I have been trying to get the position dimension on the 0.266 holes (in the middle holes compared to Dat D, Dat B, and Dat C) but I have been getting the "Tertiary axis/plane is parallel to primary axis" error. I am using one alignment for all the measurements with all 6 degrees constrained and marked all the work plains for the different sides.

Anyone see anything obvious that I missed or have anything I should try?
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  • This DRF is invalid. PCD will never let you use -C- in XACT Measure because all 6 degrees of freedom are already constrained by your primary & secondary.

    DBC interpreted literally would mean Level Z+ (or Z- depending on vector to Cyl_D, rotate Plane_B to Y+ about the direction of -D-, make -D- X AND Y origin, and make a plane or point on top face to set your Z origin. -C- would get entirely ignored as tertiary.
  • in reply to DAN_M
    According to ASME Y14.5, since the datum flag is attached to the true position, the pattern is datum D. In this case, datums B and C would not be able to constrain anything that is not constrained by datum D. Only 5 axes are constrained (all by datum D), since nothing is restricting the up and down movement (A is the only datum that can constrain this movement).
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  • in reply to DAN_M
    According to ASME Y14.5, since the datum flag is attached to the true position, the pattern is datum D. In this case, datums B and C would not be able to constrain anything that is not constrained by datum D. Only 5 axes are constrained (all by datum D), since nothing is restricting the up and down movement (A is the only datum that can constrain this movement).
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