On Tue, Apr 1, 2014, at 09:52 AM, Dave Cole wrote: > Actually 127 Pulse/rev works ok. > > If you have 5 TPI screws it works out to: 0.2 / 127 = 0.00157" per > pulse. If you count all of the edges of the full quad signal (which is > normal) you can divide that by 4 which is approximately .00157/4 = > .000393 in/count. >
127 is an odd encoder count, but I understand why: 0.000393" is 0.01mm. I wonder if this mill was used to make metric parts and they wanted the control and readout to use metric units natively? LCNC uses floating point math and can convert units with no problems, but back in the day they might have wanted to stick to integer math. Having the encoder counts be a nice round number in mm was probably a benefit. John Kasunich ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
