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Auto-Cylinder vs Circles Constructing a Cylinder: For Perpendicularity

cmmGrum
Which is more accurate, the auto-cylinder to plane OR 3 auto-circles (constructing a best fit, least squared, cylinder) to plane.

Essentially they should have the same result, correct?

When I run it I have a 0.0009 difference between the results.

Which number should I trust?

(I am building off of an IGES file)

Looking at previous posts I made sure that I had it set to Perp to Datum
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  • Are you taking the same exact hits for each method? i.e. Is your auto-cylinder 3 levels with the same number of hits with the same PA and Z as the 3 auto-circles? If your hits are not identical, then that could be why they are slightly off to each other. You also should check that they use the same best fit algorithm, as this can also tweak the features
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  • Are you taking the same exact hits for each method? i.e. Is your auto-cylinder 3 levels with the same number of hits with the same PA and Z as the 3 auto-circles? If your hits are not identical, then that could be why they are slightly off to each other. You also should check that they use the same best fit algorithm, as this can also tweak the features
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  • in reply to Mike Ruff
    They are the same PA and Z. The auto cylinder is (Nominals) (Least_Sqr). The constructed cylinder is (Best fit) (Least_Sqr). I am fairly new to this.

    I am trying to compare my CMM data to someone that is using Calypso AND an adaptive scan CMM. They are getting around 0.0005 and I keep getting around 0.0015 (while using the auto-cylinder). But when I use constructed cylinder I get closer to their measurement.
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