I'm measuring an ID... It's deep and my probe selection is limited. Everything is at A0B0.

I use a standard everyday probe 3mm x whatever and probe a circle. I trust this circle.

I then take all the hit targets and vectors from that circle and create one by one vector points then create a circle from those points.

The standard probed circle gives different (enough) results than the point to point / constructed circle to draw much concern and my question is why??? Has anyone run in to this? We're talking fifteen thousandths of an inch.

I have looked at the point to point hits and I see that it's out of round. If I construct the circle from the points leaving out the far off ones I get good results, but then why not with a standard circle with these same results? If I included the far off points the circle is way off.

Again, why the huge difference. Tried everything to get an average. Using LSBF. My boss says that it should average them and I agree.

Sound familiar to anyone?

I have one hour to figure this out. SIGH>

I use a standard everyday probe 3mm x whatever and probe a circle. I trust this circle.

I then take all the hit targets and vectors from that circle and create one by one vector points then create a circle from those points.

The standard probed circle gives different (enough) results than the point to point / constructed circle to draw much concern and my question is why??? Has anyone run in to this? We're talking fifteen thousandths of an inch.

I have looked at the point to point hits and I see that it's out of round. If I construct the circle from the points leaving out the far off ones I get good results, but then why not with a standard circle with these same results? If I included the far off points the circle is way off.

Again, why the huge difference. Tried everything to get an average. Using LSBF. My boss says that it should average them and I agree.

Sound familiar to anyone?

I have one hour to figure this out. SIGH>

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