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Runout Experts needed...

I have 2 circles that I scanned. I drew a line between the 2 and that is being used as my Datum. Can runout be measured using a line drawn between to circles? I was told that using cones makes it nearly impossible to get good runout data.
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  • Your question is very short-worded, so we can only imply a few conditions...
    I have 2 circles that I scanned. I drew a line between the 2 and that is being used as my Datum.

    Are these two circles for your datum coaxial?

    Can runout be measured using a line drawn between to circles?

    No. Runout is a surface measurement, not an axis measurement. You would be measuring concentricity if you judge only the center-line.

    I was told that using cones makes it nearly impossible to get good runout data.

    What does this have to do with cones?
  • I am just getting back to you   on this one. 

    I was working on some rotor parts. My datum A was the center of the part, a line from one end of the part to the other. (Had to use centers to check the runout as there were chamfers or cones on either side of the rotor). The measurement was a runout callout. 

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