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How straight is a row of holes.

Hi. I'm new to PC DMIS (fresh from a class). We are using 15.1 and have a Romer Arm, currently with a 3mm probe. Here's what I was asked to measure:

A row of 70 drilled holes (.25" dia, spaced 1.5"). This row was placed in the .31" thick material with no reference is an edge, datum or otherwise. There is no design print. It's just a row of holes. The Engineer wants hole spacing (I've done that). He also wants to know if the holes are in a straight line. He wants the deviation from each hole center point to a line created between the first and last hole centers. So, I constructed a BF line between the first and last holes. Then I measure from that line to each hole center. Problem is this.. I would expect to see zero for the distance between the line and the first and last hole centers. But I am seeing 0.0392" for both.
I aligned the material multiple times and this does not seem to significantly impact the results (Plane, Circle, Circle; Plane Cyl, Cyl; and currently at Plane, Line Point).
I appreciate greatly the assist and any suggestions that may come for the forum.
Parents
  • Plane level and origin Z
    first circle origin X and Y
    Last circle create line from first circle one to this hole
    Alignment Plane level
    rotate line Y about Z or X about Z (not sure how you got it laid out)
    Origin Plane Z
    Origin First hole X and Y
    create your circles in between make sure each hole your "X" direction reads "0" in THEO
    and "Y" direction reads 1.5 then the next hole 3 the next 4.5 etc.....THEO, or vise versa again unsure how this is lined up.
    Then go back and run the program
Reply
  • Plane level and origin Z
    first circle origin X and Y
    Last circle create line from first circle one to this hole
    Alignment Plane level
    rotate line Y about Z or X about Z (not sure how you got it laid out)
    Origin Plane Z
    Origin First hole X and Y
    create your circles in between make sure each hole your "X" direction reads "0" in THEO
    and "Y" direction reads 1.5 then the next hole 3 the next 4.5 etc.....THEO, or vise versa again unsure how this is lined up.
    Then go back and run the program
Children
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