Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method? (more-info, please read)

Well there is one way to do it without feedback on the
spindle.........mechanically gear the spindle to the lead screw

----- Original Message -----
From: "Russ Waters" <mycncworld@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 02, 2005 10:27 AM
Subject: Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method?
(more-info, please read)


>
> That is a very good point you made.... so, lets say one wants to turn a
spiral (wood) using a thread theory in that the spindle speed needs to be
coodinated with the z feedrate.... you would think there would be some sort
of equation for spindle rpm, number of spirals per inch, and z feed rate and
the x depth.....
>
> Just a thought,
> Russ
>
> ps To all of those people who answered with a feedback type of control,
this is what I am trying to work AROUND,,,,,not with.
>
> Jon Elson <elson@...> wrote:
>
> Russ Waters 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????
> >
> >
> Yes, but....
>
> The problem is that there will be no precise relation between the
> spindle and
> the Z axis feed, so the thread will be an APPROXIMATION of the desired
> thread
> pitch! If your spindle speed were held within 10%, then you'd get a
> thread pitch
> that was somewhere within 10%. So, for a 32 TPI pitch, you'd get
> something within
> 29 and 35 TPI. IS that good enough? I suspect not, for most purposes.
>
> Secondly, you would have no way to make multi-pass threads. Every
> thread would
> have to be cut in a single pass. Think you can cut an 8-TPI thread in
> one pass?
> Hmmm, I'd like to see your lathe!
>
> So, these are the reasons why feedback is used.
>
> Jon
>
>
>
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