Auto-Cylinder vs Circles Constructing a Cylinder: For Perpendicularity

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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AndersI over 6 years ago

Just be careful - the definition of "Projected zone" is not exactly the same as "Calculation length" - it works for parallelity, angularity and perpendicularity to set the length with (P), as these properties are unaffected by the position. Don't try this trick on a POSITION, CONCENTRICITY or SYMMETRY unless the print actually has a (P)!
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cmmGrum over 6 years ago in reply to AndersI

Understood. The perp i am trying to measure is pins coming out of a part and the CAD has the entire pin, so the auto-cylinder was trying to put the data from less than half of the pin onto the entire pin. I have the P set to what is actually coming out of the part now.
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cmmGrum over 6 years ago in reply to AndersI

Understood. The perp i am trying to measure is pins coming out of a part and the CAD has the entire pin, so the auto-cylinder was trying to put the data from less than half of the pin onto the entire pin. I have the P set to what is actually coming out of the part now.
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