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. That adds up quickly. Can anyone aim me in

the

> right direction. The last time I talked to the manufacture they

focused

> on my G code for the loss in calibration. Since I am using mostly

G01

> commands I hardly think this is the problem but I could be wrong.

If

> anyone could help I would appreciate your comments or PM.
>
>
> Harry Siebert
>

Harry, it might be that your drive is not set up right, you'll need
to know if the drives takes pulses on the rising or falling edge of
the step signal and check the software to work as the drives does.
If the incoming signal is different from what the drive takes then
it 'll skip the first pulse for every movement it does, so if you do
like 10 passes it will add each missing step.
run the machine with no parts, then measure how much did it lost
or gain then divide this by your drive steps set up, you should e
able to find out if the drives are skipping a step or not.
If it does change the software pulse edge( raising or falling) and
check it again.

Fogassa