On Wednesday 17 July 2019 21:22:21 Jon Elson wrote: > On 07/17/2019 03:51 PM, John Dammeyer wrote: > > There are a number of videos out there changing up the G0704 gear > > driven spindle to belt drive. Some use toothed belts, others a > > double set of pulleys. Most of the videos explain that they will > > soon but the slotted RPM sensor disk back on but for most of them > > they've not done that yet. > > > > For LinuxCNC what sort of encoder resolution is required on the > > spindle to be able to do tapping. I know I can do it with one pulse > > per rev with my Electronic Lead Screw to cut nice threads but I also > > don't slow down the spindle at the end of a tap into a blind hole > > while tracking spindle speed. > > Well, if you are using a software encoder counter, you have > to limit the encoder count * RPM to what that counter can > follow. If using a hardware encoder counter, then that is > not a limitation. > On my Bridgeport, I am using the 81-tooth bull gear to > create an encoder, so that gives 324 quadrature counts/rev. > That has worked very well. > > Jon
I am using the 60 tooth main gear, part of the backgear drive on my Sheldon. Some quantization noise gets into the z drive, but not enough to hurt the rigid threading, and since I'm driving with a vfd, I've never been tempted to put in a PID for speed control, the vfd is more than enough. > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
