CNC Lathe Threading - Alternative method

In a message dated 3/13/2005 5:58:22 AM Eastern Standard Time,
CAD_CAM_EDM_DRO@yahoogroups.com writes:
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I would like to come up with a alternitive method of threading
with a cnc lathe,,,,, not using a feedback system with conjuntion of
the G33 code, but would it be possible to cordinate the spindle
speed with the feedrate of the z axis to do threading? I think it
could be done, has anyone tried this, or have a theory on how it
could be done????

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I used to build resistor winding machines. The resistor bobbin was driven
with a stepper on each end, both driven in parallel.

The pulses to the stepper driver also went to a Red Lion counter that could
be programmed for a number of pulses, resetting and sending the reset pulse to
another stepper driver that drove the pitch stepper.

So, as the bobbin turned, divided pulses were also sent to the pitch stepper
so we could get any pitch spacing we wanted. When I built the first one, I
was concerned that there might be descrete steps showing up in the windings,
but it worked very well. I've often thought of trying this method on a regular
lathe.

Earle Rich
Alva, FL
Mont Vernon, NH


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