import step with open surfaces

[Sandra_ME30]

fabrizio_brescia 21.12.15 15:31

Good morning to all, I know it's a topic that's already dealt with, but I want to ask for an opinion about an idea that might be insensitive about the direct modification of step files. For our work, we need to control the interference between electronic cards and containers that are designed by customers. we always happen that either our PCb 3d model, or the 3d step model of the customer have open parts and therefore, not being solidified, they cannot be taken as a reference for automatic controls. correcting the inaccuracies becomes complex and among other things exulates from our specific skills.
I looked at the structure of the step file, and I wondered if it's so important, at least for us (other than a moldist) to have object with resolution at the 15 but decimal digit. This resolution is probably not well managed when importing, so I would like to have your opinion about the possibility of writing a program that opens the step file (it is an ascii, therefore simple) and replaces the "real" coordinates with the same numbers approximated to the nth decimal digit I will decide. In this way, according to you, assuming that you only have 5 decimals, could import be better?

thanks for the comments

 

[Sandra_ME30]

fetus 21.12.15 16:03

Bye.
apart from that you can work on import tolerance, I always recommend solidifying the model. If it's cad-shaped parts through solid functions, the step can't suck. even when I worked importing steps with variable fittings, sweeps and other surfaces I always managed to solidify. Of course we must know the import data doctor well. Could you post an example file (the most complicated and ugly you have) so I can estimate how much it takes to repair it?

 

[Sandra_ME30]

fabrizio_brescia 21.12.15 21:47

I looked at the various configurations and various menus of wf3 but found nothing that would allow to set import tolerances. change, closing the surfaces, of the step may also be possible, but as the work is always evolving (the mechanic of my client updates it following the variations of my printed circuit) would be too expensive all the time to work to make it solidizable. I wonder what the problem is. I have taken a look at the ascii file of the step, are many lines that identify 3d points and then functions that join them. I don't have a simple open model, but now I'll try to create it, but I think the written coordinates are accurate, that is, where a surface ends, another one starts, although with many decimals the values are always consistent. probably it's the cad that importing points and using them generates errors, in the sense that it can't build the curves that pass exactly for the points specified in the step, so 2 curves that in theory had to be exactly flanked are also slightly detached (so I believe, but it's my assumption)
Maybe by limiting the decimals the cad could be better able to build the curves, it's a hypothesis. However, I have noticed that the problem arises more if the part is complex
In fact, even my boards with few components are exported regularly, then if I put the same components, but in much greater number, there are also openings on parts that were previously perfectly closed.
to verify it I should have a step of a simple part, like a cube or a cylinder that is opened... tomorrow I try to build it, then I'll post files for your comments

Thank you.