On Tuesday 02 March 2021 03:51:26 andy pugh wrote: > On Tue, 2 Mar 2021 at 07:36, Gene Heskett <ghesk...@shentel.net> wrote: > > The problem with homing the bs-1 is that the home switch is > > activated by a notch in the hub of its spindle > > It's probably best to home a rotary axis to a 180 degree target. With > search and backoff speeds set high, and a slow latch. > Agreed. But cutting the notch for the switch roller strains a 5mm carbide tool, that is hardened steel. So I quit cutting while I still hadn't broken the tool. I could see in flexing.
> Then it only ever has to make a half turn. > > But, then, I have never bothered to put any switches on my rotary, it > seems to be very rarely necessary to home it as the work that goes in > isn't indexed to the chuck. That could be fixed now that I've got a decent 3d printer. But I'd need some instructions on how to get freecad or openscad to make me a ring to fit the edge of the spindle flange, with a single tooth spanning 180 degrees. openscad seems like it might be easier. But my attempts have not been successful. All I seem to be able to generate are squares. GT2_3MM pulleys are a piece of cake, I've made a 13 tooth for the motor on the A axis that came with the 6040 mill, and an 83 tooth with a huge axle hole that is a tight press fit over the OEM axle pulley, using it for a hub since it has the key machined in. I'm now waiting for the junk that has a pair of 3mm tooth x 6mm wide belts on it to arrive, but that's not till the end of the month. Then I've got to design and make a couple sliders to carry ball bearing idlers to get a tight belt, well wrapped on the 13 toother. This Dremel DigiLab 3d45 printer, makes 3mm pulleys that actually fit the belt OOTB, whereas I'm still fiddling with the steps/mm settings on the ender-3. PETG is at the extreme end of the enders temp ranges, but the 3d45 acts like that's its sweet spot although its slower to heat at startup. PETG parts made on the ender, like that 83 tooth sprocket, are almost 100 grains heavier without much the stringing when the same .stl is fed to the 3d45 once cura has been taught to drive the 3d45. Beautiful parts that don't need a 30 minute cleanup. 5 minutes and they're 100% ready for use. And PETG is tougher/harder than PLA by quite a bit. It should wear very slowly. And I've not figured out how to enable freecad-19 to draw me anything, the drawing tools are all grayed out. Thanks Andy. 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
