Re: cnc lathe - threading - alternitive method?????

hi,
to thread cut with any degree of accuracy you will require a single
pulse per rev input, and a 'n' pulses per rev input.

the single pulse synchronises the start of cut.

the 'n' pulses per rev provides input to a phase lock loop to
synchronise rotational velocity of the spindle with tip velocity of
the cutter. should this be ignored then pitch errors will occur when
the load on the spindle changes due to applied cutting forces.

to acheive repeatability both inputs must be debounced.

chrisw



--- In CAD_CAM_EDM_DRO@yahoogroups.com, Russ Waters
<mycncworld@y...> wrote:

> Hi to the group..... I need to pick your brain on this one!
>
> 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????

>
> Russ
>
>
>
>
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