Editing a STEP file in Fusion means I'm throwing out productivity for the rest of the day

[FrodoLoggins]

I ALWAYS yes ALWAYS run into issues when editing a STEP file. No really. ALWAYS.

Ok so I need to make a fillet a little smaller so I can mill it properly. Can't, I get an error. Ok kinda a dumb thing to get stuck on but fine no problem, just cut out the fillet and add a new one. Real simple stuff here no big brains required. No big deal just gotta project some geometry, extrude/cut, now add the fillet, done. Ok now let's do THE EXACT SAME THING for 3 identical features. Nope, some BS issue.

Yes the STEP files are of course fine. They're all made by other engineers who know what they're doing. They can't ALL not know how to save a file properly.

Apparently people have been having issues editing STEP files since 2015? What a joke.

[dsouzasujay]

Hi @FrodoLoggins ,

Can you attach the .step file here to the reply?

[HughesTooling]

Can you share the model or part of it if you can't share the complete model.

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@FrodoLoggins wrote:

Yes the STEP files are of course fine. They're all made by other engineers who know what they're doing. They can't ALL not know how to save a file properly.

Apparently people have been having issues editing STEP files since 2015? What a joke.

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You'll be surprised how many models done by "professionals" have problems. See it all the time where bad symmetry gives errors like you have, come to that see it on the forum here where a badly constrained sketch causes havoc and the users are convinced it's a bug in Fusion. Not going to say 100% the original STP's the problem but without seeing what you're working with you're not going to get much help.

When you removed the old fillet, did you try just selecting the chain of fillets and deleting rather than project and extrude cut?

Mark

[HughesTooling]

Before you add the fillet does the vertical edge where your arrow is pointing measure the same on the feature where it works.

[jeff_strater]

There are likely multiple things going on here:

1. STEP, as a "least common denominator" format, necessarily results in some approximations in some translations.  A round trip from Fusion native to STEP back to Fusion will result in not the exact same data.
2. We have no control over the authoring application that produced the STEP file.  Each authoring tool may have a different accuracy or tolerance imposed.  I have seen some designs from some CAD systems that contain remarkably large gaps and other inaccuracies in the geometry.  I'm not sure whether these gaps are native to those CAD tools (some are definitely more tolerant than others), or introduced/magnified by the translation to/from STEP.

IMO, this is not a Fusion problem specifically.  My guess is that many/most CAD systems will have similar issues with similar data.  They may manifest themselves in different areas, but I believe that most will exhibit similar sets of issues.

[HughesTooling]

If you're modifying imported files have you noticed the Simplify tools in preferences? They have been available in the manufacture models environment for awhile, not sure when they were enabled in the design workspace. @jeff_strater  when was this added, only spotted it a couple of weeks ago!

Remove Face is quite useful as it can chain select fillets. Still might need to remove complicated fillets in order but quite helpful.

Mark