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Locking in Basic Dimensions to center of Circle/ Radius

A.Morales
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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  • Create an alignment at the basic location.
    set your workplane to Xplus
    Make an auto-vector point theoretically perfect to the radius
    (Theo/<0,0,0.125)(0,0,1))Per say you have a R.125 that is on you Y+/-axis
    copy the vector point code.
    Open pattern in Edit>Pattern
    Select the rotational value you want (say you have a 90º arc and want 5 points)
    Set (-/+ value will change rotation direction)18 for angle and 4 for number of times
    select 'ok'
    Place cursor at the end of the code lines for your original feature
    Select Edit> Paste with Pattern
    You now have 5 hits with proper nominal and vectors.
    Construct your diameter(circle) report Rad size...
    ******* If you wish, delete the original alignment and select 'Yes' to the update nominal question******
    The points are now relative to your main alignment system and can be patterned about your parts periphery. (in Zplus workplane)
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  • Create an alignment at the basic location.
    set your workplane to Xplus
    Make an auto-vector point theoretically perfect to the radius
    (Theo/<0,0,0.125)(0,0,1))Per say you have a R.125 that is on you Y+/-axis
    copy the vector point code.
    Open pattern in Edit>Pattern
    Select the rotational value you want (say you have a 90º arc and want 5 points)
    Set (-/+ value will change rotation direction)18 for angle and 4 for number of times
    select 'ok'
    Place cursor at the end of the code lines for your original feature
    Select Edit> Paste with Pattern
    You now have 5 hits with proper nominal and vectors.
    Construct your diameter(circle) report Rad size...
    ******* If you wish, delete the original alignment and select 'Yes' to the update nominal question******
    The points are now relative to your main alignment system and can be patterned about your parts periphery. (in Zplus workplane)
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