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:
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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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!Yes, but....
>
>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????
>
>
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
Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html
http://groups.yahoo.com/group/jobshophomeshop I consider this to be a 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.
NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner
Yahoo! Groups Links
---------------------------------
Do you Yahoo!?
Yahoo! Search presents - Jib Jab's 'Second Term'
[Non-text portions of this message have been removed]
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?????