Centroid Community CNC Support Forum

suntravel wrote: ↑Thu Jun 06, 2024 9:41 am In the video it looks like the spindle stops at the start of the cut, maybe not enough power, cut too deep, too much feed rate.

Hard to tell from the video, but the cutter is not touching the material when it stops. So this isn't a matter of the machine not having enough torque to cut, since it's cutting air when it fails. I have my starting cut positioned about a 1mm away from the surface.

If you turn the spindle by hand in CW direction, is the rpm on the DRO positve or with an - ?

suntravel wrote: ↑Fri Jun 07, 2024 1:35 pm If you turn the spindle by hand in CW direction, is the rpm on the DRO positve or with an - ?

While facing the chuck (looking at it from the tailstock), if I turn it CCW (the direction it turns while cutting), the spindle speed is negative. If I turn in CW it's positive.

IIRC, that's wrong.
Try inserting a minus (-) before your encoder-count-value in the wizard

You must view from the other side, your spindle needs to turn CW for cutting.

Try to set Parameter 34 to -10000

With M3 S100 DRO must show 100 not -100

Uwe

Spartan117 wrote: ↑Fri Jun 07, 2024 2:07 pm IIRC, that's wrong.
Try inserting a minus (-) before your encoder-count-value in the wizard

Yup - that did the trick. Thanks!

I just ran the same part after switching the numbers back to CSS. I think it was a little faster than I'm comfortable with (got up to about 1800RPM near the center, where it hit its limit. So I may slow it down slightly, but it is working now.

It is no trick, just reading the manual

438 Spindle slave position error The slaved axis moved too far in the
wrong direction during a
spindle-slaved move (such as in rigid
tapping). The job is cancelled.
Check Parameter 34 for an
incorrect plus/minus sign in
front of the encoder counts

Uwe

Rotations about an axis are defined by "looking" along the axis in the positive direction.

friolator wrote: ↑Fri Jun 07, 2024 2:23 pm I just ran the same part after switching the numbers back to CSS. I think it was a little faster than I'm comfortable with (got up to about 1800RPM near the center, where it hit its limit. So I may slow it down slightly, but it is working now.

Yeah, my first try brought me similar findings
My lathe can spin up to 4krpm, and I (too ) did not set G50 first... Woohaaa, now THAT is fast