Re: Lost steps

Jan,
Thanks for the reply.
Your first two paragraphs are a bit beyond my knowledge base. I don't
know what circuits properly bypassed means. Maybe you can help me
here. The driver is new from Camtronics, (kit), which is in popular
use I believe, so we're not talking exotic or home brewed or old. I
kind of think it is not the driver, but bad motors, bad connections,
or erroneous signals from somewhere.
The disconnected motors turn freely so I think that mechanical motor
problems are not on the list, especially since I have three motors
acting mostly the same way. Additionally the motors look very new
compared to the rest of the machine.
Puzzler hunh?
Thanks,
Jerry

--- In CAD_CAM_EDM_DRO@egroups.com, JanRwl@A... wrote:
> In a message dated 8/20/00 3:42:09 PM Central Daylight Time,
Ozzie@h...
> writes:
>
> << During an hour's
> no load testing the motor gets quite warm, maybe 100 degrees. >>
> Now, that, alone, sounds like you have the driver set wrong, if
it's
a
> "pulse-width chopper" type, or, the wrong "ballast resistors", of
one of the
> old "unipolar" kind.
>
> The "step skipping" sounds like electrical noise, and though you
have taken
> SOME steps with the foil, etc., you may not have the CIRCUITS
properly
> by-passed!
>
> It is also POSSIBLE that you have bad bearings. I had a
relatively-new
> Superior (NOT!) Electric motor "do that" on me, years back, and I
disovered
> the "front bearing" did NOT have a SEALED, perm.-lubricated "DCC"
bearing,
> but only a SHIELD! That is, dust could "get it" along the shaft,
as
the
> end-bell's hole was a good 0.05" larger dia., of course, and the
"front
> bearing" was pressed in to that bell, so it was a "clear shot" from
the
> outside-world to the bearing's ball-races! DUM! I hadda keep the
machine
> going, so I spent the $200 to replace the "bad" motor, only to
discover,
> later, it was only the bearing causing the hassle! So, I cobbled a
clever
> neoprene/grease-filled seal which did the trick, and then went
about
> replacing the offending bearing. Took some care, as dismantling a
stepper is
> a "no-no"! Done, and it's "perfect" again! Just because catalog
lies!
> (Sealed bearings, lubed for the life of the motor.") What can one
do???