On Fri, 03 Apr 2009 19:52:21 -0400, you wrote:
>Yes. They can be any distance apart as long as the distance adds a half a >slot. And I believe I would adjust that by using a dual trace scope to get it >as close to 90 degrees out of time as I could, opto stuff works by ir diodes >and measuring it physically could be a long way off of 90 degrees just from >tolerance in the opto-interrupters. No problem with the opto's, they are buffered OPB916B's - rise/fall time of just 50nS with a nice clean signal. I will be using a scope to set them up, I'll make the bracket so the opto's can be adjusted more than a slot and a space in relation to each other. >Motor reverse is going to need some sort of a servo lashup. I'm doing the >spindle motor in my micromill with a repaired original driver, removed from >the mill head and installed alongside a PMDX-106 in a 3.5"x4.5"x7" plastic >box, with 2 dpdt P&B relays boosting the teeny ones on the PMDX-106, so I have >complete speed and direction control right from emc. But I haven't servo'd it >yet, mainly because of the difficulty in attaching an encoder disk like yours >to the spindle. Reversing works now, all I need it to do is be predictable where it stops on commanding a stop/reverse. >If anyone comes up with an idea of how that might be done internally to the >micromills now nearly empty head houseing, without drowning the opto's in >flying grease from all those plastic gears, I'm all ears. Get rid if the gears and use timing belts, no grease then ;) Steve Blackmore -- ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
