I did that too. I printed a 200mm diameter disk with 72 black white pairs, read with a P5587 Photoreflector. It currently only reads speed, but I'm about to replace the sensor to give quadrature output, so I can gear hob, as Andy has shown.
-----Original Message----- From: John Dammeyer [mailto:[email protected]] Sent: Thursday, 18 July 2019 11:56 AM To: 'Enhanced Machine Controller (EMC)' Subject: Re: [Emc-users] Spindle control 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:[email protected]] > 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:[email protected]> > [email protected] > <https://lists.sourceforge.net/lists/listinfo/emc-users> > https://lists.sourceforge.net/lists/listinfo/emc-users
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