Locking in Basic Dimensions to center of Circle/ Radius

I program/ operate a global performance 7.10.7 CMM and I am running 2014 version of PC DMIS.

I am attempting to measure some radii that are located by basic dimensions. What is the best way to do this? I tried to input theoretical values of X, Y, Z, and the diameter in an auto circle format, using a "Fixed Radius" equation. When I execute the auto circle (manually) the radius (value [size]) remains locked but the locating dimensions change, from the theoretical values, to actual values, based on actual hits. Since the locating dimensions are basic I am really looking for the X, Y values to remain constant (locked) and the size of the radii to change based on the actual hits.

Should I be using a different equation when measuring the arc(s)? Any suggestions are appreciated.

P.S - This is a cast part. I am thinking that the imperfections, highs and lows, of the radii are causing PC DMIS to mis-locate the radii because the hits are so "out of round". Please help. Thanks!

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A.Morales over 9 years ago

First, translate your origin(zero) to the center of the radius (Using the basic distances)
Next, take an initial vector point (with correct theo's and vector) against the rad.
Then use copy/paste with pattern (deg offset) along the rad.
Finally construct diameter with all the hits.

Can some explain what Roberto wants me to do with the vector points and the copy/ paste section of his instructions? Sounds like he is directing me towards what I want but I am unsure what/ how to do the vector points he is referencing.

Is this method similar to the Hexagon tech sheet on "Measuring a Small Arc"?

Thanks for the replies but please keep them coming.
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A.Morales over 9 years ago

First, translate your origin(zero) to the center of the radius (Using the basic distances)
Next, take an initial vector point (with correct theo's and vector) against the rad.
Then use copy/paste with pattern (deg offset) along the rad.
Finally construct diameter with all the hits.

Can some explain what Roberto wants me to do with the vector points and the copy/ paste section of his instructions? Sounds like he is directing me towards what I want but I am unsure what/ how to do the vector points he is referencing.

Is this method similar to the Hexagon tech sheet on "Measuring a Small Arc"?

Thanks for the replies but please keep them coming.
Cancel
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