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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.
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  • He also wants to know if the holes are in a straight line.


    Well the only reason, I'm not satisfied is you specifically stated the engineer wanted to know how straight the holes were, you are not doing that. Unless you misworded your original statement. If your basing this off a different alignment. Then no they probably aren't straight to an edge. But straight to themselves, leaving him/her scratching his/her head, probably making unnecessary changes.
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  • He also wants to know if the holes are in a straight line.


    Well the only reason, I'm not satisfied is you specifically stated the engineer wanted to know how straight the holes were, you are not doing that. Unless you misworded your original statement. If your basing this off a different alignment. Then no they probably aren't straight to an edge. But straight to themselves, leaving him/her scratching his/her head, probably making unnecessary changes.
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