Measuring perpendicularity of a hole.

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  • Measuring perpendicularity of a hole.

    Trying to measure the perpendicularity of the hole marked in the attached picture. Would appreciate input on how best to do this.
    Attached Files

  • #2
    Measure -A- and level

    Measure -B- rotate and offset (basic) angle

    Measure hole as cylinder and report perpendicularity.

    B&S CHAMELEON/PCDMIS CAD++ V2011

    There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

    sigpic

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    • #3
      How can that hole be perpendicular to A?

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      • #4
        Perp is an orientation control. In this case the hole orientation is to be controlled to [-A-B-]. [-A-] controls two rotation and [-B-] controls the final rotation... Once the rotations are controlled the feature can be measured to them.

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        • #5
          I feel strongly that perpendicularity and parallelism should be replaced with angularity in ISO and ASME. The basic math for all three are the same...

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          • #6
            Measure A as plane.

            Measure B as plane.

            Intersect A and B to get a line.

            Measure hole as cylinder.

            Check perpendicularity of the cylinder to the AB line.

            Laugh, because the freaking material is .05 thick, at best you're measuring a cylinder with an axis length of .04.

            EDIT: I just checked, without bonus the hole can be at 5.7°, with full bonus it can be 17.7°
            Last edited by RandomJerk; 08-09-2017, 11:46 AM.

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            • #7
              It is funny but, It often placed on the print for consistency. A good print will always request that [-A-] to be inspected to itself, [-B-] be inspected to [-A-] and [-C-] be inspected to [-A-B-] because after each feature in the primary alignment is inspected in its correct order the defining alignment features are fit for use in the following inspections to come.

              Simple definition in construction terms:

              A = the garage foundation... it must be flat and level.
              B= the first wall put up... it must be square to the foundation... if the wall is not square to the foundation you will get a different measurement at the top of the wall vs the bottom.
              C= the second wall put up... it must be square to the foundation and the first wall put up...if the wall is not square to the foundation and the first wall you will get a different measurement at the top of the wall vs the bottom and the left side vs the right side.

              After meeting these requirements all features-fixtures of the garage can be placed in its correct location as long as they are measured from the three primary features "foundation-Wall1-Wall2".
              Last edited by Lord_Warfield; 08-09-2017, 02:29 PM.

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              • YGOLORTEM
                YGOLORTEM commented
                Editing a comment
                Ah.... if only everything were as simple as an |A|B|C| garage.......where do you ever find a flat garage floor? It must be sloped for drainage. You must be thinking of the garage foundation being completely level.
                Last edited by YGOLORTEM; 08-09-2017, 02:16 PM.

              • Lord_Warfield
                Lord_Warfield commented
                Editing a comment
                ok ok... ill change it to foundation... lol.

              • Lord_Warfield
                Lord_Warfield commented
                Editing a comment
                I actually was thinking someone out there would say " the floor is sloped for drainage '... but, it puts an easy picture in mind.

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