Partial Circle Help.

[[Me...]]

Hello All,

I have this 3.063 radius cut into the end of this thin walled part. There is not much surface to get a good measurement. I am getting a lot of variation. It seems to be dependent on how the radius is oriented to the stylus, but it is hard to orient perfect.

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[[Br...]]

Try using constraints. Whichever axis' control the location of the radius you measure, check them under constraints in the
evaluation settings.

You can do this on the Characteristic side as well if you prefer.

[[De...]]

If the radius is timed to the cross holes, then you could make an alignment that uses one of the cross hole locations for planar rotation.

You can then use the alignment you have created in the feature. This way when the feature is measured it will be measured relative to your alignment and should allow you to have the probe more accurately positioned in relation to the radius when it is measured.

This should help the accuracy / repeatability of your measurement.

[[Me...]]

Along the same lines, you can use Radius Points and set up an alignment that centers on the bores and is offset the 5.06. This will eliminate the algorithm it uses to calculate the diameter and just give you a radial distance from nominal location.

[[Mi...]]

Are you scanning? If so there is some point masking going on in the start of the scan, default is I think is .3 sec. I have had success in adding a second circle path in the strategy starting where the first one end and going the opposite direction. This will fill in the blank at the start of the first scan. You didn't mention speed but try slowing