Compound Datums / Dash Datums

[[Ni...]]

Hello,

How would I create a compound datum/dash datum in calypso? I measured both diameters as cylinders and created a "3d line" that runs through both centers. The problem with that is that it won't let me do MMC on that 3d line when I use it as a datum.
I tried using "parallel cylinders" which did let me do MMC but the software crashes when I use "parallel cylinders"

Thank You,

zeiss3.PNGzeiss2.png

[[Jo...]]

Post
by Eric Moberg » Thu Aug 27, 2020 1:11 pm
Creating a line between datum A and datum B and using that as a datum will not be correct. Use a step cylinder as datum since you have plenty of surface at the datums to work with.

[[Jo...]]

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This was in another thread originally with an A-B Datum..

[[Ma...]]

But Eric is right. MMC is used for measured element but not for datums, which in 3dline can not be used. But i didn't see step cylinder. It exists? I'll have to look

[[9e...]]

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Features drop down > Special Geometries > Step Cylinder is where you will find that. 🙂

[[Ni...]]

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I created a step cylinder and used recall feature points, picked Datum B and datum D, to create my B-D Datum. I am now able to apply MMC on that B-D datum.
Thanks a lot! 😮