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

Ok... that is another way of doing it..... but it under cnc control, and would like to do by programming rather then adding gearing, which in itself is limited...

Russ

Bob Muse <mtebob1@...> wrote:

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"
To:
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 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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