Re: cnc lathe - threading - alternitivemethod?????
Posted by
Bengt
on 2005-03-13 00:38:49 UTC
Hi Bob,
What are the threads you want to cut? Take a close look at the
toolmanufacturers recommendations as regards cutting, size and
material. Look at the hp needed to do what you want to do and
probably you will manage with simple means. Easily done with PC and
common sw.
Bengt
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@s...>
wrote:
What are the threads you want to cut? Take a close look at the
toolmanufacturers recommendations as regards cutting, size and
material. Look at the hp needed to do what you want to do and
probably you will manage with simple means. Easily done with PC and
common sw.
Bengt
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bob Muse" <mtebob1@s...>
wrote:
> Hi Chrisand any of
>
> I see your point. The question is-- can this be done with a PC
> the common software packages? Or maybe I should use the bigKollmorgen
> servo motor and amp that I have for the spindle drive on the latheI am
> retrofitting.are very
>
> Bob
> ----- Original Message -----
> From: "Christopher Williams" <chris@c...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Saturday, March 12, 2005 4:16 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading -
> alternitivemethod?????
>
>
> >
> > Hi
> >
> > john, I agree you can cut theads with single pulse however you
> limited with respect to feed and tool load. Therefore cycle timesare
> extended greatly due to only being able to take small cuts. Thismay not
> matter for a hobbyist, however for a job shop this is notacceptable.
> >speed and
> > Bob, to elaborate....the control system monitors the spindle
> adjusts the cut feed to maintain lead. We control feed as thiscan always
> be controlled to higher precision than the spindle. Generally aspindle is
> controlled with an 8 or 10 bit dac control signal driving aninverter.
> Theredoer at best we have 1024 control inputs. Any motioncontroller worth
> its salt will have a minimum of 65000:1 velocity control range. Bytool load.
> mearsueing the spindle speed to a high precision we can make fine
> adjustments to cut speed therefore we are able to cut with heavy
> >alternitive
> > Chris
> >
> > -----Original Message-----
> > From: "John Guenther" <j.guenther@v...>
> > Date: Sat, 12 Mar 2005 18:17:54
> > To:<CAD_CAM_EDM_DRO@yahoogroups.com>
> > Subject: RE: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading -
> > method?????Mach2 or
> >
> >
> > TurboCNC uses a single pulse per rev for threading on a lathe.
> > Mach3 uses either a single pulse per rev or a single index pulseand
> > multiple pulses to sync the spindle speed. I have used Mach3with a
> singlenot
> > pulse per rev sensor to cut threads and it works great. This is
> reallytakes a
> > as complicated as everyone thinks it should be. It only really
> > single pulse per rev to cut accurate threads on a CNC lathe.IMHO you
> > should get single pulse per rev threading working first and thendetermine
> > if there is any benefit to multiple pulse per rev setups. Ibelieve that
> > Mach3 is limited to 24 pulses per rev maximum.alternitive
> >
> > John Guenther
> > 'Ye Olde Pen Maker'
> > Sterling, Virginia
> >
> >
> > -----Original Message-----
> > From: Bob Muse [mailto:mtebob1@s...]
> > Sent: Saturday, March 12, 2005 17:05
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading -
> > method?????threads.
> >
> >
> >
> > Hi Chris
> >
> > This is what I have been thinking it would take to cut accurite
> Docapability. The
> > you know of any CNC controller programs that have this
> > velocity loop for the spindle could be a function of the spindledrive
> couldalternitive
> > it not?
> >
> > Bob
> > ----- Original Message -----
> > From: "chrisw0567" <chris@c...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Saturday, March 12, 2005 12:47 PM
> > Subject: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading -
> > method?????single
> >
> >
> > >
> > >
> > >
> > > hi,
> > > to thread cut with any degree of accuracy you will require a
> > > pulse per rev input, and a 'n' pulses per rev input.velocity of
> > >
> > > 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
> > > the cutter. should this be ignored then pitch errors willoccur when
> > > the load on the spindle changes due to applied cutting forces.threading
> > >
> > > 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
> > > with a cnc lathe,,,,, not using a feedback system withconjuntion of
> > > the G33 code, but would it be possible to cordinate the spindlethink it
> > > speed with the feedrate of the z axis to do threading? I
> > > could be done, has anyone tried this, or have a theory on howit
> > > could be done????wanliker@a...,
> > > >
> > > > Russ
> > > >
> > > >
> > > >
> > > >
> > > > ---------------------------------
> > > > Do you Yahoo!?
> > > > Yahoo! Search presents - Jib Jab's 'Second Term'
> > > >
> > > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Addresses:
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> > > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........wanliker@a...,
> > > bill
> > > List Mom
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> >
> >
> >
> > 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
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> > Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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> > timg@k...reach it
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> > [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
> ifto be a
> > you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
> > sister site to the CCED group, as many of the same members arethere, for
> OTPOSTING THEM.
> > subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........wanliker@a...,
> > bill
> > List Mom
> > List Owner
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > 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,
> timg@k...reach it if
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> [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
> you have trouble.to be a
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
> sister site to the CCED group, as many of the same members arethere, for OT
> subjects, that are not allowed on the CCED list.POSTING THEM.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........wanliker@a...,
> > bill
> > List Mom
> > List Owner
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Kind Regards,
> >
> > Chris Williams
> >
> > Let your email find you with BlackBerry from Vodafone
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
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> > List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com,
> timg@k...reach it if
> > Moderator: pentam@c... indigo_red@q... davemucha@j...
> [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
> you have trouble.to be a
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
> sister site to the CCED group, as many of the same members arethere, for OT
> subjects, that are not allowed on the CCED list.POSTING THEM.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> > bill
> > List Mom
> > List Owner
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
Discussion Thread
Christopher Williams
2005-03-12 16:18:00 UTC
Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitivemethod?????
Bob Muse
2005-03-12 20:08:52 UTC
Re: [CAD_CAM_EDM_DRO] Re: cnc lathe - threading - alternitivemethod?????
Bengt
2005-03-13 00:38:49 UTC
Re: cnc lathe - threading - alternitivemethod?????