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Runout - Axial vs Radial

acgarcia
I have a part that is constantly out of tolerance on radial runout. My datum is a cylinder and my runout feature is a circle. When I change runout from from radial to axial, it’s now within tolerance.

I looked up radial runout and axial runout and the difference is radial is how far off a feature is off the datum axis but still parallel and axial is how much of a tilt the feature has to the datum axis. Which one should I use and why and I out of tolerance with only one and not both?


https://www.celeramotion.com/applimotion/support/faqs/what-are-radial-and-axial-runout-error/#:~:text=Radial%20runout%20is%20when%20the,parallel%20to%20the%20main%20axis.
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  • Thanks for the info as this always confuses me. Due to the size of my Datum A which is like 8 inches in diameter by 8 inches long, and my runout feature being about 3 inches in diameter but only like 1 inch long, it would only make a cylinder about .0.100" long because the the extension on my touch trigger head would crash into the part. I thinking about checking a part on 1 of my LSP CMMs. I might be able to make a longer probe to try and get a nice spread out cylinder. I haven't tried but I don't think that a short cylinder would make a difference compared to a circle.

    I went ahead and reported true position for reference and you can clearly see the axial deviation. You can rotate the part 180 degrees on the CMM and my axial deviation move to the opposite directions so that pretty assuring. A machinist manager checked things out and found runout in the CNC. The drill that makes the hole and chamfer for the tail stock is slightly off center causing the tail stock to *** the part over. I haven't been asked to check anything differently or change anything like number or points or circles to cylinder yet.
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  • Thanks for the info as this always confuses me. Due to the size of my Datum A which is like 8 inches in diameter by 8 inches long, and my runout feature being about 3 inches in diameter but only like 1 inch long, it would only make a cylinder about .0.100" long because the the extension on my touch trigger head would crash into the part. I thinking about checking a part on 1 of my LSP CMMs. I might be able to make a longer probe to try and get a nice spread out cylinder. I haven't tried but I don't think that a short cylinder would make a difference compared to a circle.

    I went ahead and reported true position for reference and you can clearly see the axial deviation. You can rotate the part 180 degrees on the CMM and my axial deviation move to the opposite directions so that pretty assuring. A machinist manager checked things out and found runout in the CNC. The drill that makes the hole and chamfer for the tail stock is slightly off center causing the tail stock to *** the part over. I haven't been asked to check anything differently or change anything like number or points or circles to cylinder yet.
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