On Thursday 13 August 2020 02:06:56 Chris Albertson wrote: > On Sun, Jul 19, 2020 at 5:39 PM Gene Heskett <ghesk...@shentel.net> wrote: > > The zip contains a .step file. What does linux use to render/view > > that? That file does contain the bearing part numbers, > > A ".step" file can be opened in any 3D CAD program. With Linux > FreeCAD or Onshape. > > I would suggest just deleting any STL files and using the .step file > to make you own STL files that way you have an editable file. STL > files are very hard to edit
As I have discovered. But I'll have to become MUCH more expert at freecad, so far I haven't figured out how to get an editable format out of freecad that shows me the tooth counts and profiles, and how they could be individually adjusted for a better fit, then re-locked together so the whole thing could be adjusted in size and remain functional. That would be my target. For the telescope, which is a well balanced piece of work if assembled and the counter-weights are properly adjusted, a rather small force can manhandle a rather ungainly sized bit of mostly empty air. This particular unit is designed to be driven by a nema-17 motor, and the commercial stuff made today by Meade and Celestron, is moved by electric clock motors in the desktop versions. And obviously has backlash, intended to be handled by leaving it slightly out of balance and always approaching the star it's being aimed at from the same final direction. But the last one really should up up-sized to be operated by a larger nema-23 of say 3NM torque if its to be hooked to the worm of a BS-1 clone, and moved as its used to cut gears as I see being done by Andy's videos. Freecad has in the past been such a moving target that the tuts are worthless 3 months later. So the first thing to do in freecad, is to find in that .step file, where its sizes can be interlocked and cross-coupled, so smaller, or larger versions of it can be made just by adjusting one MASTER SCALE value. But at the same time still useing readily available metric bolts to build it with. For instance, I just noted yesterday, that there are no nut pockets in one side of the bearing carrier, so if using M3 hex nuts to assemble it, either there needs to be swinging clearance for the nuts, (there is now) but the 14mm long bolts specced needs to grow to 16mm to gain the extra length to reach the nut if its on the surface. IOW if one side has counterbores for the head of a 3mm allen head cap screw, I'd expect the other side to have a nut pocket. I'd also expect that the nut carriers sticking up from the thicker side of that part would grow in height to lock into or thru the capping part on the opposite side in order to long withstand the pressure of adequately tightening the grub screws to the motor shaft. Final assembly will include a dab of JBWeld on the mating faces there. That is one of the reasons I will mount the motor on the GO704, mount the the CBN cup I have in the spindle, power up the motor to hold its position, and make the motor shaft into a double D-flat so both grub screws are sitting on the flats. That CBN wheel is amazing once I got the arbor to hold it straight and true. Thats progress but not in the direction of being able to use freecad as as editor. That I haven't grokked yet. Thanks Chris. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
