Re: CNC Woe's

--- 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