RE: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitive method?????

TurboCNC uses a single pulse per rev for threading on a lathe. Mach2 or
Mach3 uses either a single pulse per rev or a single index pulse and
multiple pulses to sync the spindle speed. I have used Mach3 with a single
pulse per rev sensor to cut threads and it works great. This is not really
as complicated as everyone thinks it should be. It only really takes a
single pulse per rev to cut accurate threads on a CNC lathe. IMHO you
should get single pulse per rev threading working first and then determine
if there is any benefit to multiple pulse per rev setups. I believe that
Mach3 is limited to 24 pulses per rev maximum.

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia


-----Original Message-----
From: Bob Muse [mailto:mtebob1@...]
Sent: Saturday, March 12, 2005 17:05
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitive
method?????



Hi Chris

This is what I have been thinking it would take to cut accurite threads. Do
you know of any CNC controller programs that have this capability. The
velocity loop for the spindle could be a function of the spindle drive could
it not?

Bob

----- Original Message -----
From: "chrisw0567" <chris@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, March 12, 2005 12:47 PM
Subject: [CAD_CAM_EDM_DRO] 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
> >
> >
> >
> >
> > ---------------------------------
> > Do you Yahoo!?
> > Yahoo! Search presents - Jib Jab's 'Second Term'
> >
> > [Non-text portions of this message have been removed]
>
>
>
>
>
>
>
>
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OFF Topic POSTS: General Machining
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you have trouble.
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sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

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