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Different Results No Radius vs Subtract radius distance dimension

Smasherofprobes
Hello everyone, not easy to explain this one. I have not had to do this in a long time and I am searching for the right answer.

I was tasked with measuring the relationship between 2 punches (Hole and Polygon) and the matching retainer but the distance between is different when I use No Radius VS Subtract radius. Obviously the numbers will be different because of the radius not being used but when I take the total distance from the Retainer and Subtract the total distance I get from the punches the numbers are different.

For example using No Radius I get 13.07 - 12.732 (0.338mm) and for subtract radius I get 7.307 - 6.666 (0.641mm) between CIR1 & LIN2
& No Radius 13.128 - 12.709 (0.419mm) and for subtract radius I get 7.355 - 6.603(0.752mm) between CIR2 & LIN3

Can someone explain why this is? Should I be using No radius or Subtract Radius to find the relationship between the two features?

I dimensioned 2D distance in the same direction as Lin1 for both. I am not the best at explaining things, forgive me Slight smile




Parents
  • I used PERP to feature and got the same results.
    How would you go about measuring this? I Wish I had a file to compare to but we don't. The Polygonal hole is being pulled during production so they wanted to verify the pitch between the punches and the buttons where the punches enter.

    I haven't had to do something like this in about 7 years so forgive me, I'm just not sure why i'm getting the different results by about 0.3mm when using No Radius and Subtract radius and which is more applicable to this situation, or if both are wrong.
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  • I used PERP to feature and got the same results.
    How would you go about measuring this? I Wish I had a file to compare to but we don't. The Polygonal hole is being pulled during production so they wanted to verify the pitch between the punches and the buttons where the punches enter.

    I haven't had to do something like this in about 7 years so forgive me, I'm just not sure why i'm getting the different results by about 0.3mm when using No Radius and Subtract radius and which is more applicable to this situation, or if both are wrong.
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