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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!
  • What is the callout you are trying to report?

    Fixed_Rad is only going to lock the size and adjust you 'ACTUAL' positions, can't determine by your post what your looking to accomplish.
  • 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.
  • 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.

    +0.9999
  • 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.
  • 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)
  • Can some explain what Roberto wants me to do?

    Sorry for the "spanglish" Slight smile

    Thanks R2 for elaborating.
  • THANKS SO MUCH FOR ALL THE HELP! Really appreciate all the responses.

    I am going to have to make some time to try the method you suggested. "Making the auto-vector theoretically perfect to the radius" is something I have yet to try. Also editing the pattern is new to me. But then again, this is ALL new to me. Anyways, thanks again for all the advice.
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