Re: Trak cnc 2 control replacement

Jon
I removed the end covers from the servo motors..the motors
have their own power cord, looks like an extension cord [rubber] with
1 black, 1 white wire...whatever is on the end of the motors has its
own cord also, flexable stainless steel with seven wires inside;
white, black, red, orange, green, purple and bare ground of maybe 24
gage or less; attached to a circut board along with black rectanguler
[1/2 x 1"] object attached by 16 or so pins, and few other electronic
items. Looking behind the board can just see a small portion of a
disc of about 2" in diameter that is clear[can see through it] and
has radial lines on the face. Rotates with motor. Seems there is a
block with groove that lined portion of disc passes through with
about 8 wires that go from block to circut board. Could not find any
brushes...best I can discribe without unscrewing circut board [I be
chicken] and useing little mirror...Seb.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> seb fontana wrote:
>
> >
> > Jon, I can only say that the manual says that the encoders use
the
> >time proven gage-wheel principle; wheel that runs on bed and sadle
> >and even talks of adjusting..model M250B...not improbable chip-
skip
> >but they are sealed.
> >
> The whole side of the table that the wheel rolls on is sealed? I
guess it
> would be pretty safe then.
>
> > Now I have found that the motors are servo rated at 280 in-oz
max
> >continuous torque..Has what >looks< like an encoder on end..if it
is
> >an encoder couldn't it serve to account/correct for backlash, ect?
> >Say it is a tachometer, is there a way to tell? What would the
> >benifit be or not? Seb.
> >
> >
> If it has brushes, or just two wires coming out, that is a DC
tach. If
> it has
> at least 4 wires just from the end of the motor, not including the
motor
> wires itself, then it may be an encoder or a resolver. Can you
give more
> of a description?
>
> Some servo amplifiers require a tachometer, as they are a velocity
servo,
> and need to have a direct measurement of velocity. It is just very
rare
> to have two different encoders on the same axis.
>
> Jon