Hi Sven, The 3 sensors are used to give A,B and index pulses. This form of encoder yields full direction and speed information from the 2 quadrature channels as well as a once per rev reference pulse. For threading, you really only need the A channel and the index pulse, but for rigid tapping, you also need the direction information provided by the second quadrature channel. The index pulse is used as the reference so that the multiple threading passes all start in the proper position on the work.
cheers On Sat, 2009-06-13 at 18:44 +0200, Sven Wesley wrote: > 2009/6/13 Lawrence Glaister <ve...@shaw.ca> > > > Hi Kirk, > > Looks like you have been having fun in gcode. One thing you might want > > to consider for an encoder wheel is to make the cutouts the same size as > > the solid areas to get as close to a 50% duty cycle on the detector(s) > > as possible. You didnt say if you were just using the wheel for a pulse > > generator or a 2 channel encoder. You might also consider adding another > > hole for an index detector if you need that. > > Along a similar line, you can check out a lathe spindle encoder I built > > a while back. The gcode program can be adjusted to make an encoder of > > any number of pulses. If you are using slot source/detectors, you have > > to make sure the holes in the disk can be reached. > > > > cheers... post a picture when you get it made! > > Lawrence > > > > http://members.shaw.ca/swstuff/spindle-encoder.html > > http://members.shaw.ca/swstuff/spindle-encoder.ngc > > > > > What am I missing, why do you need 3 encoders? > > Regards, > Sven > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables unlimited > royalty-free distribution of the report engine for externally facing > server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
