I bought a few inductive sensors on eBay. These are surprisingly repeatable and very precise. They are cheap and easy to use. THe come in different diameters. The one I like best has M12x1 threads on the body.
Here is an example: ebay.com/itm/DC-3-Wire-6-36V-Inductive-Proximity-Sensor-Detection-Switch-NPN-LJ12A3-4-Z-AX-US/ <https://www.ebay.com/itm/DC-3-Wire-6-36V-Inductive-Proximity-Sensor-Detection-Switch-NPN-LJ12A3-4-Z-AX-US/162683352852?hash=item25e0aef714:g:ZqcAAOSw3GtZxVse:rk:2:pf:0> Place this so that it detects the steel set screw that holds the drive gear to the spindle. If there is no such screw then find a place to install a steel screw that sticks out about 5mm and have it pass close to the sensor head. For experiments, I made e 3D printed plastic bracket that has M12x1 internal threads. The supplied lock nut is too crude. A 20mm deep threaded hole holds the sensor more securely. The sensor has very clean output and measures distance, as well as the "good" quality microswitches. Use the leading edge of the pulse is an "index" BTW these are not so good for sensing gear teeth, A "bolt head sensor" is what these are. THey would make a very nice home sensor for a mill. because they are water and oil proff with no moving parts and are "non-contact" On Thu, Nov 29, 2018 at 9:46 AM andy pugh <bodge...@gmail.com> wrote: > On Thu, 29 Nov 2018 at 17:16, David Berndt <ber...@uberwin.com> wrote: > > Ok, thanks guys. I'll go with a seperate encoder to pickup a once per > > rotation count. Are there any requirements about on/off span in relation > > to A/B. > > > > No, any once-per-rev pulse will do. > As has been mentioned, unless you want to do peck-tapping you can probably > get away without an index. > I think that even gear-hobbing would work fine. > You would need a proper index for spindle orient if there is a tool > changer. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is designed > for the especial use of mechanical geniuses, daredevils and lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1916 > > _______________________________________________ > 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
