Accuracy Question

Forum|Forum|10 years ago
November 18, 2015
3 replies
7198 views

How does Creo (using Creo Parametric 3) handle accuracy. It confuses me that there is a relative accuracy and an absolute accuracy. And that relative accuracy seems to be the default.

Also having some issues with imported parts. Our workflow is this:

- Part designed in Catia (Catia global tolerance set to 0.001mm) and saved as CATpart.

- Part imported into Creo for mould/jig design but Creo states that accuracy is now 0.05mm. Setting the accuracy finer (back to 0.001mm) results in part being converted from a solid to a surface due to (usually very many) naked edges. File needs to be extensively repaired to continue work in Creo or work is continued at 0.05mm accuracy.

Why is a part accuracy changed. How does the change in accuracy impact the design as a whole?

Thanks

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Sheet Metal Design

R

RonSt.Pierre

12-Amethyst

you may want to review this thread

Absolute vs. Relative Part Accuracy

ron

S

sfinke

Author

1-Visitor

Thanks. It confirms what I had suspected in terms of AA vs RA

BUT

It doesn't explain the constant issues we have with Catia/step/iges files.

Also its worth pointing out that the thread in your link is 7 years old and the link mentioned in the thread is already 9 years old. Any changes to this?

R

RonSt.Pierre

12-Amethyst

in all honesty, I did a search using "absolute vs relative" and I got a host of hits.

I open one that seemed to address your question regarding accuracy.

Regarding importing, try this thread

Is there a way to define accuracy for STEP export?

ron

M

mdebower

18-Opal

Importing files, defining accuracy settings, and setting defaults have a bunch of configuration options too. You may want to look into the config files to see what options you want to set.

Chances are that you can change a few settings that will affect the way your accuracy / import works and you won't have to worry about it much after that...

S

sfinke

Author

1-Visitor

Ok it seems the problem may lie with the imported part.

Our Creo template has accuracy set to 0.0005mm. The imported file (created in Catia) will not solidify at anything under 0.01mm. My fix for this is to have the Catia join tolerance increased from the default 0.001mm to, say, 0.05mm and see if that works.