I am not having much luck finding help on this, so I will start a new thread. I am measuring a diesel crankshaft, and need to find the tangency point of the radius to the OD, as well as the size of the radius. The radius is a nominal 2.54mm. The bad part is that the spacing tolerance is 0.75mm. I was using an autocircle to find the center of the hole, but as the crank deviates from nominal spacing, the radius moves away from (or towards) the center of the circle. It will then report the diameter incorrectly, as I believe it is using all of the points. Is there a way in the AutoFeature circle to discard points outside of a particular standard deviation, as you can in a constructed circle?

I found an older program where the programmer took 10 hits over 60 degrees of the radius, constructed a circle, and excluded the points outside of 3 standard deviations. There are 2 problems with this...

a) I have not clue how he determined what vectors to use for the points, as they start on the OD, then move into the radius.

b) 7 bearings and 6 pins x 14 radii x 10 points per radius = 1,820 manual points!! That would be pretty time consuming and prone to error.

I found an older program where the programmer took 10 hits over 60 degrees of the radius, constructed a circle, and excluded the points outside of 3 standard deviations. There are 2 problems with this...

a) I have not clue how he determined what vectors to use for the points, as they start on the OD, then move into the radius.

b) 7 bearings and 6 pins x 14 radii x 10 points per radius = 1,820 manual points!! That would be pretty time consuming and prone to error.

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