cincinnati axis spindle question

jlviloria wrote:

I'm working on a lathe cincinnati, which has the option of tool. My question right now is how to set the spindle to work as the C axis

I think this needs to be done with a bit of cleverness in HAL.
You would basically use two different PID controllers, one for normal spindle mode, commanded by motion.spindle-speed-out (or motion.spindle-speed-out-rps) and another commanded by the motion.spindle-orient-angle pin.
You would then use a mux2 component to decide which PID output is sent to the spindle motor controller. The mux2 select would be linked to the motion.spindle-orient pin.
This gives closed-loop control of spindle speed, and closed-loop position control.
There is a component called "orient" that is intended to help. www.linuxcnc.org/docs/html/man/man9/orient.9.html but I think you still need the other components I suggested.
It is probably a good idea to disable the inactive PID controller when the other is doing the job.

I keep meaning to set this system up with my mill, but I haven't done so yet.

jlviloria wrote:

how he would control the angle or want to make an contour on the machine, if equipped with a DC motor? not require a servomotor? or you can control a DC motor that way?

If the spindle has an encoder then the motor _is_ a servo.

I am working on a sample lathe XZC config at the moment. Might have it working tonight.