CAD CAM EDM DRO - Yahoo Group Archive

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

Posted by Russ Waters
on 2005-02-02 10:27:15 UTC
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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Discussion Thread

Russ Waters 2005-02-02 08:27:59 UTC cnc lathe - threading - alternitive method????? Tom Hubin 2005-02-02 08:57:15 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? Kim Lux 2005-02-02 09:55:45 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? Jon Elson 2005-02-02 10:06:17 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? Russ Waters 2005-02-02 10:27:15 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method? (more-info, please read) Drew Rogge 2005-02-02 10:33:53 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? Bob Muse 2005-02-02 10:52:50 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method? (more-info, please read) Russ Waters 2005-02-02 11:13:07 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method? (more-info, please read) Bruce Pigeon 2005-02-02 11:49:33 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? R Rogers 2005-02-02 12:20:06 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method????? R Rogers 2005-02-02 12:38:28 UTC Re: [CAD_CAM_EDM_DRO] cnc lathe - threading - alternitive method? (more-info, please read) chrisw0567 2005-03-12 13:00:13 UTC Re: cnc lathe - threading - alternitive method????? Bob Muse 2005-03-12 14:06:33 UTC Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitive method????? John Guenther 2005-03-12 15:19:23 UTC RE: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitive method?????