Re: motor inteference?/loosing steps

Hi,
The Sherline spindle can make large amounts of electrical noise,
some of which can be picked up by the STEP lines on the Xylotex
board. Grounding both the spindle motor (and mill shuld help - if
they are not already grounded). One Xylotex customer used a power
line filter. He wrote:
====================================================
"My EMI interference
is now completely gone and now everything can be
plugged into the same outlet and run without problems.
Solution that worked for me is a 0.68uf 500v capacitor
across the brushes in the spindle motor (which reduced
the stepper jitter by about 75%)and I switched to an
in-line EMI Filter from Allied Electronics (cat no.
689-3582) mounted this inside the drive enclosure
close to the Linear P/S. Also used a shielded
3-conductor AC power cord (shield attached to the
cabinet side only) just for good measure. The steppers
are real happy now".
Hope this helps.
Cheers, Cletus
====================================================
Jeff
http://www/xylotex.com


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett <KM6VV@a...>
wrote:

> Hi Randy,
>
> You should ground the mill, and ground the spindle motor to the

mill.

>
> Your driver box is probably picking up the noise on it's input

lines.

> Do you have optoisolation? If not, then the "active" signal is

high,

> and more likely to pick up noise.
>
> We've heard of this on a xylotex board, and it was discussed on
> SherlineCNC. The answer, I believe, was some R/C filtering on the

input

> leads. Might help you.
>
> Also keep the data lines into the driver box separate from the AC

power

> lines.
>
> Alan KM6VV
>
>
> flashboiler wrote:
>
> >
> >
> > Hello, I'm new to the group and cnc thanks in advance for any

help!

> >
> > I recently bought a taig mill with sherline steppers, denvercnc
> > control and running Mach2 controller on winXP home 2400Mhz dell
> > computer.
> >
> > I'm having problems with what I believe is interference from the
> > spindle motor or general A/C noise.
> >
> > If I leave the mill spindle running and have Mach2 doing nothing
> > (holding the steppers at 0,0,0 and wait about 2 minutes and then
> > check my handwheel zeros the steppers will have moved .002

to .035

> > (or more). Mach2 still says 0,0,0. I can observe the
> > servos "glitching" randomly, but they always seem to move in one
> > direction. If I switch the mill motor on and off or switch my
> > Sherline lathe motor on and off nearby 90% of the time one or

more

> > steppers will glitch.
> >
> > I tried running power from a different circuit down to the motor
> > (extension cord) this seemed to help a little (or maybe wishfull
> > thinking?) but the problem is still there.
> >
> > Yesterday I mounted a sherline motor/head/speed control on the

mill

> > and the problem got worse. It's there with the Taig or Sherline
> > motor though.
> >
> > Should I try grounding my mill? Should I ground mill,

controller,

> > computer all to the same point?
> >
> > Thanks for any suggestions,
> > Andy
> >
> >>