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Concentricity, how can I get a proper reading?

BWood
So, I am using a romer arm to measure concentricity of two holes. With a traditional CMM (and different software) we have found the concentricity of the holes to be 0.26mm. However, with the romer arm it shows the concentricity to be 2.9mm. If you take the acuals from the two holes and calculate the concentricity it should read like the traditional CMM???? Why is PC DMIS not giving me the correct reading? Any suggestions on how to measure this dimension with the Romer ARM?
Parents
  • But fear not! Most of the time when the concentricity symbol is placed on a drawing it is used incorrectly and what the designer is really trying to control is position.


    Hey - this symbol shows 2 circles on the same centerline - that's exactly what I need! What's this called...... concentricity? I'm using that! Rolling eyes

    Seriously though, you are right. It's a rare case where concentricity could not be replaced by position or runout.
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  • But fear not! Most of the time when the concentricity symbol is placed on a drawing it is used incorrectly and what the designer is really trying to control is position.


    Hey - this symbol shows 2 circles on the same centerline - that's exactly what I need! What's this called...... concentricity? I'm using that! Rolling eyes

    Seriously though, you are right. It's a rare case where concentricity could not be replaced by position or runout.
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