Two hole pattern used as a Datum

[[je...]]

How do I use this two hole pattern as Datum C in other feature control frames?

Position Datum.JPG

[[Je...]]

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Jerry,

Have you ever tried the parallel cylinders feature? I think that would work well.

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Jeff Frodermann
Meier Tool & Engineering
Anoka, Minnesota
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[[je...]]

Thank you Jeff. I look forward to trying that. I've moved to something else right now, but I'll set it up later and let you know how it works in my application.

[[Cl...]]

Parallel Cylinders? Is that a new option?

[[je...]]

I've been using Calypso for 16 years and never noticed this feature. Thanks again Jeff, I was able to use the two cylinders as a Datum. I spoke with the engineer about using the top cylinder as Datum C and referencing the bottom cylinder back to C. He was agreeable, so that's how I reported it. I got better numbers using the parallel cylinders but I don't know why. I'll have to study it more before I use it in programs.

Parallel Cylinders.JPG

[[SH...]]

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Yes, 2019 onwards.

[[SH...]]

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I think you should use geometry best fit alignment. Your pattern can constrain five degrees of freedom,but parallel cylinder can only four. Depends upon the placement in the datum reference frame a feature can constrain different degrees of freedom. I think in your case it constrain only rotation.

[[Ri...]]

Parallel Cylinder works, but also when you create a Bore Pattern it will create an alignment for you that can be used.