Re: CNC Woe's

Thanks for all the fine advice. I did find out what the problem was.

The lathe plugs into the "Might Drive" main box and is turned on and
off by the control box. While the spindle was running I watched the
steppers and notice the X was jumping steps when it was not supposed
to be moving. I unplugged the lathe spindle motor from the control
unit and plugged it in the wall and the X stepper stopped jumping.

Since the spindle was feeding off the controller the same as the
steppers, the current supplying the spindle was somehow feeding back
on the stepper signal causing it to jump.

So there you have it. A 6 month problem fixed so I can stop tearing
my hair out. :) Thanks again for your help all.


Harry Siebert

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Siebert" <hs3980@> wrote:
> >
> > I have a microkinetics CNC lathe and am having a calibration
> problems.
> > Every time I do an inside Dia cut operation my (X) looses its
> position.
> > Now the setup is tight and not moving and the motors shafts

appears

> to
> > be nice and tight where conected to the motor. The (X) moves nice
> and
> > smooth but my ID keeps going up for example 15.00mm to 15.02mm

every

> > operation it performs.
>
> Are you using G90 absolute or G91 incremental programming?
>
> If using G91, your motions must add up to EXACTLY a round trip or

the

> next run will be off by the error amount.
>
> Fred Smith - IMService
> http://www.cadcamcadcam.com/hobby
>