Re: [CAD_CAM_EDM_DRO] motor inteference?/loosing steps

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
>
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