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How straight is a row of holes.

Mike8
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.
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  • Thanks Kirbster. My Alignment looks OK with the Plane, Line, Point I have now, but I'll go back and check one of my previous Plane, Circle, Circle alignments per your notes. My "X" increments by 1.5 and my "Y" though ranges .639 at hole 1 to .561 at hole 71

    Here is a snip of the current alignment.
    .





    Hi Schlag,

    I changed my Constructed Line to Circle dimensions from 2d to 3d and the results changed dramatically to more what I expect (a few thousandths off vs. 30+). The results did not change when I changed the constructed line from 2d to 3d. So was my main problem a 2d vs 3d issue?

    Can you provide guidance when I would select 3d vs 2d for a constructed line or a dimension? I should recall this from training but do not recall an emphasis on this.

    All the best to you guys and thanks again!
    Attached Files
Reply
  • Thanks Kirbster. My Alignment looks OK with the Plane, Line, Point I have now, but I'll go back and check one of my previous Plane, Circle, Circle alignments per your notes. My "X" increments by 1.5 and my "Y" though ranges .639 at hole 1 to .561 at hole 71

    Here is a snip of the current alignment.
    .





    Hi Schlag,

    I changed my Constructed Line to Circle dimensions from 2d to 3d and the results changed dramatically to more what I expect (a few thousandths off vs. 30+). The results did not change when I changed the constructed line from 2d to 3d. So was my main problem a 2d vs 3d issue?

    Can you provide guidance when I would select 3d vs 2d for a constructed line or a dimension? I should recall this from training but do not recall an emphasis on this.

    All the best to you guys and thanks again!
    Attached Files
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