On Tuesday 28 July 2020 02:59:01 Chris Albertson wrote: > .STEP started out as the native format for Solidworks but is now an > ISO standard. You can read and write the file with many different > programs. FreeCAD is one. > > But the file is just a plain old ASCII text file. If there is some > data inside try "grep" or just a text editor and search for a word. > > NIST has a web app that puts a .step file into a spreadsheet > https://www.nist.gov/services-resources/software/step-file-analyzer-an >d-viewer > > <https://www.nist.gov/services-resources/software/step-file-analyzer-a >nd-viewer> What are you making? I read a post about 50 ball bearings. > THat is a complex machine. A four legged walking robot? Got a link > to the .step file? > No, 3 of a harmonic drive I found on thingiverse, each of which uses 7 ball bearings. One larger one for output shaft, and 6 smaller ones for the wave driver. Drives with a std nema-17 motor. The link has been posted to this list twice.
<https://www.thingiverse.com/thing:4505585> But if making it, a warning, the bearing carrier is a couple hairs small, so when rendering it. I'll have to wait on the bearings and build one to see what sort of a ratio to set the printers x,y scales to in order to build the right size for those final 6 parts. It has IMO a slightly small flex gear, and it could be that a similar correction might be needed for that. It looks like a good design otherwise, but these mods will bring its precision more into line with the several hundred dollar metal clones. Making the flex gear bigger by 1 or 2%, will reduce the flexion needed to drive it, extending its life. Or one could scale the outer spline down that same %. I'll fix the wave bearing carrier first for full engagement, and if that pulls the teeth too far apart at the inside flex where the teeth clear and are stepping across each other, and tips are pointed at each other, what they clear by could be reduced to zip by scaling up the flex gear as it prints, probably by reprinting them once that ratio is determined. That should reduce the flex and make a longer lasting drive. 2 of these 3 will become telescope drive parts, I've had a Meade DS-10 for ages that needs driven from a linux proggy called stellarium and one might wind up redrilled for a nema-23 mount and maybe adapted to drive that BS-1 indexing head's worm. That will stress it a lot harder as I intend to be able to move it under cutting load. Might have to remake the moving parts from PET for that. We'll see... > On Mon, Jul 27, 2020 at 11:10 PM Gene Heskett <[email protected]> wrote: > > Greetings all; > > > > Freecad newbie, and I'd like to get a printout of the parts list in > > this .step file. The list it shows in the upper left panel. > > > > This is version 16, is it possible, and if so how? > > > > Thanks. > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
