I think it is best to back up and look at the bigger picture. Solid couplers are almost never the way to go. Or if you do use a solid couple the motor or encoders needs to be mounted with rubber bushings. I shouldn't be 100% solid.
Buy one of these, then bore of one of the holes for the larger shaft. aliexpress.com/item/1005002515369464.html <https://www.aliexpress.com/item/1005002515369464.html?spm=a2g0o.productlist.0.0.66a55ba8X6BPzA&aem_p4p_detail=202106180916204351489560580880019183962> That said, I've made couplers and I think as long as you do all the drilling and boring *without ever removing the part* from the chuck it is as concentric as your lathe can make it. You get better results using shorter drill bits. On Fri, Jun 18, 2021 at 8:52 AM John Dammeyer <jo...@autoartisans.com> wrote: > This isn't as much a LinuxCNC question but more of an approach to how to > machine something. > > The attached photo shows a coupler from a 3/8" encoder to 14mm Servo Motor > so I can test on the bench the Pi4 closed loop encoder behavior. > > This one didn't turn out very well. I drilled all the way through and > then used a reamer to bring it to 3/8". It's a firm sliding fit on the > encoder shaft. Without removing it from the chuck I then drilled halfway > to 13mm and then used a 14mm reamer to bring it to size, testing with the > motor shaft. > > Problem was the reamer was slightly tapered at the front so it did a poor > job. I finished it up with the boring tool but maybe a few thou too > large. However the wobble seems much worse than that. > > I'm thinking the better approach would be to drill all the way through > undersize 3/8" and then drill half way with 13mm. Then only use the boring > tool to bring the back half up to 3/8" and the front up to 14mm. This way > if the initial hole wasn't concentric with rotation the boring tool would > ensure it is. > > Make sense? Or is there a better way? > > Thanks > John > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
