cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

How to change STL faceting of flat circular surfaces

Re: How to change STL faceting of flat circular surfaces

Jonathan,

I agree %100 with the file format comment.

As for Mechanica, I don't have a license. I ran a "Creo Simulate Lite" simulation, but I don't think I can extract the mesh. The results didn't look very promising in the geometry area, but I have never used it before.

Is there any way I can use the lite version to make a NASTRAN mesh?

Re: How to change STL faceting of flat circular surfaces

I believe it can be done at least in full Mechanica (Creo/Simulate) but I must admit I can't immediately find it there, either! We need someone with experience of this - or, ideally, a PTC rep...

Re: How to change STL faceting of flat circular surfaces

Jonathan,

Thanks for trying, I appreciate it.

I checked on the support page again this morning and my case is still on hold. I hope that means they are seriously looking at it.

Re: How to change STL faceting of flat circular surfaces

Hi Donald,

This is an interesting thread to me because we use the DEFORM software. I've used DEFORM for a long time but have yet to export STL die models from Creo.

I would like to learn how to learn the optimal STL settings for use in DEFORM for when I submit my first dies.

It appears that you use DEFORM for use in an extrusion type process. We use DEFORM for simulating drop forgings in the die and wedge roll. It is a very good software and their tech support is excellent.

I do hope PTC will be able to help you in tweaking STL settings. Please let us know what you find out.

Re: How to change STL faceting of flat circular surfaces

Hi Paul,

Using Creo to make my STLs for DEFORM works very well. I'm still figuring out what settings to use. I normally go by file size and how the resolution looks around the smaller features, as well as the quality of mesh I'm going to generate.

I use Creo to build my progressions based upon volumes (lot of relations) and then I make my dies to fit those parts. If they are round dies and punches, I will export the iges files from Creo, this is also working very well for me.

Re: How to change STL faceting of flat circular surfaces

With the CAD software we are out moding we do have some issues with STL quality. DEFORM has to heal a number of open entities with every job. In the test I did with Creo prior to our purchase the STL model came into DERFORM without any errors. I'm optimistic that the geometry will be cleaner with Creo. This should give us better results.

I will need to establish settings like you suggest for the best quality and performance. Our dies are typically 24 by 22 inches with perhaps 10 inches of height. The most critical thing for us with STL creation will be the ability to have flat surface polygons that are the full length of the flats, otherwise the polygon count will be crazy. We just need to hold tolerances tight inside the impressions itself.

There is a limitation to polygon count in DEFORM in regards to performing Die Stress Analysis. I'm crossing my fingers that there will be adjustability with the export of STL's.

Re: How to change STL faceting of flat circular surfaces

Paul,

That sounds interesting. I never get to work with the bigger items. Most of my simulations are of small, round objects (fasteners for example)

If you ever have any key (and/or Creo) files you can share, feel free to send me an example (just being curious), especially if you want a second opinion.

A lot of my simulations are considered proprietary and are quite honestly pretty boring .

Re: How to change STL faceting of flat circular surfaces

UPDATE

Support suggested I start a product suggestion, so I did. I will continue using my workaround whenever necessary.

Thanks to everyone for their suggestions. I really appreciate the feed back I have received from the community!

Re: How to change STL faceting of flat circular surfaces

Hi Don,

Old topic but, have you tried creating just a wedge and patterning it to produce the final shape? I think it would give even better control than concave/convex.

Re: How to change STL faceting of flat circular surfaces

Holy Zombie thread! I just ran across it and had basically the same thought. He could build the model as specific surfaces, like you used to have to do in the Olde Days of 2-1/2D AutoCAD. Then see if the STL would treat it differently.