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

Parents

AndersI over 6 years ago

Note that the length of the cylinders will be different, and has an effect on the perpendicularity result. An auto cylinder gets the length from the CAD Surface, while the constructed (or measured) cylinder gets its length from the hits (ie. shorter than the auto cylinder). You can test by adding "projected zone" - (P) <length> - to your two perp dimensions to verify that they give the same result when applied to the same length (assuming the hits are the same).

What version of PC-DMIS? I believe the length calculation for auto cylinder has changed during the life of PC-DMIS.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
cmmGrum over 6 years ago in reply to AndersI

CAD++ Version 2017 R1

I think the fixing (P) has solved or at least gotten me closer.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Reply

cmmGrum over 6 years ago in reply to AndersI

CAD++ Version 2017 R1

I think the fixing (P) has solved or at least gotten me closer.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Children

No Data