Outer most diameter between ribs.

[[Me...]]

I have a part that that has 2 diameters on the same level. (See photo). What we need is the inside diameter with outer tangential evaluation. the main issue is that the ribs are not always in the same spot. How can I have the computer filter out the ribs perfectly with each run?

Thanks for reading!

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[[Am...]]

You would use multiple circle paths in sections exactly where you want to measure and then control the rotation of your part with your base alignment.

[[Am...]]

How are you measuring it now? Is it just sweeping across the entire thing and its picking up both diameters?

[[Am...]]

Or I could be misunderstanding what im looking at here and you can just adjust your filtering if this is one feature and it just has that variation due to the process.

[[Ch...]]

If its a circle, I would suggest creating a recall feature. Under recall measurement points, right click on that feature, add range limits and there is an option to use a radial angle as a measurement field. If your part clocking is good, you can say recall points from 10 to 20 degrees, from 40 to 60 degrees etc and make your smaller circle. I would err on the side of caution and add some make your angle ranges smaller than the nominal so you dont pick up some high data from the outer rib.

[[Me...]]

Thanks guys,
I ended up using the multiple circle method. I cant clock this feature easily but I used the cylinder feature to grab the inner points and then had to use outer elimination filters. It was lengthy but I finally got it.

[[Er...]]

One idea to clock the part when you don't have a good fixture to clock the part is to add a programmable stop in the first feature of your part. We usually will have a couple of socket head cap screws, or standoffs to rotate the part on. We then program the stop to be on the center of a hole, a slot, or even an edge, and in the stop given direction to rotate the part so the center of the feature is centered on the probe. You make sure to have the part exactly how you need it on your first manual alignment, but after that, you can use your alignment without (CNC) to run the parts and it will repeat beautifully so you aren't constantly doing manually alignments.