| Keep
Your Runouts Straight!
Confusion continues to exist over
the difference between circular runout (one arrow) and total
runout (two arrows). To inspect the two runouts illustrated
below, an inspector could set up the inspection as
illustrated. While rotating the part on the pin, several
slices along the part could be inspected.
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The worst
circular runout error occurs at the slice with the
greatest variation. In this case two slices vary a total
of 0.03.
Total runout is the
difference between the highest and lowest readings found
over the entire feature. The highest reading was +0.02
and the lowest reading was -0.09. Therefore, the total
runout for the feature is 0.11, the difference between
+0.02 and -0.09.
In this case the part
would pass both runout checks.
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