Thanks Jon, I have lots of room under the pulley to mount something. Steel disk with slots and a hall sensor would easily do it. It's what I was going to do for simple RPM sensing into the Shumatch DRO with the reflective tape. Another project that was never finished. John
> -----Original Message----- > From: Jon Elson [mailto:el...@pico-systems.com] > Sent: July-17-19 6:22 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Spindle control > > 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 > > > _______________________________________________ > Emc-users mailing list > <mailto:Emc-users@lists.sourceforge.net> Emc-users@lists.sourceforge.net > <https://lists.sourceforge.net/lists/listinfo/emc-users> > https://lists.sourceforge.net/lists/listinfo/emc-users
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