RE: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas: LikeJonE's?

I thought I mentioned it to you before that my mill is the same as
yours. I have a 600 oz in servo motor driving a 3/1 ratio timing pulley
mounted on the knee drive shaft. I have had this set up for several
years and there is no problems that have resulted from this
modification. I think I sent you pictures of the Z axis motor mount. I
sometimes run the knee all day long with an incredible number of up and
down moves. The motor barely gets warm and there is no measured wear on
the knee or acme lead screw. It will be the simplest way to cnc your Z
axis. Just remember to may sure the the oilers for the knee are filled.
Dan

-----Original Message-----
From: Marv Frankel [mailto:dcdziner@...]
Sent: Friday, November 22, 2002 7:53 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas:
LikeJonE's?


Dan,
Thanks for the comprehensive input. My Enco mill is not quite that
heavy, but I was concerned about moving the knee up an down. Was the 4th
axis on that Tree Mill the quill? My biggest concern is motorizing
that, with positive control.

Marv Frankel
Los Angeles

----- Original Message -----
From: "Dan Mauch" <dmauch@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, November 22, 2002 6:59 AM
Subject: RE: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas:
Like JonE's?


> I have to jump in here.
> I recently helped a customer put a 4 axis servo system onto a Ebay
> purchased 3500# Tree Mill which is probablty equivalent to a series 2
> mill. The machine as purchased had beautiful ballscrews with zero
> backlash on the XY axis. The knee was driven by a AC servo motor
> mounted onto a 5:1 gearhead driving an acme leadscrew. It was obvious

> that the machine had seen a lot of use but was in near perfect
> mechanical condition. The A/C servo controls were dead. During the
> retrofit we simply replaced the existing servo motors with ones
> compatible with the G320. It was really simple . Unbolt the existing
> motors and replace it with a standard servo motor with a 5/8" shaft.
> It used a 2/1 ratio timing belt/pulley. After it was changed over the
> only problem we ran into was that for some reasons the calculated size

> of the motor for the knee proved inadequate so we replaced the Z motor

> with a larger motor. It ran beautifully with a low (50)cpr encoder on
> the knee servo motor. From what I could see that machine must have had

> many thousands hours or use and yet the acme leadscrew on the massive
> knee, with no other assistance, seemed to be in good condition as we
> never did see any backlash or slop in the knee. The guy is currently
> using it to make parts. I can see no reason why driving the knee will
> cause him any wear concerns. Dan
>
> -----Original Message-----
> From: Marv Frankel [mailto:dcdziner@...]
> Sent: Friday, November 22, 2002 12:46 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas:
> Like JonE's?
>
>
> Tim,
> Thanks for pointing out the screw wear problem to me. I hadn't
> even considered it, but it makes sense if you think about the constant

> up-and-down in almost the same area on the screw. I was pointed to
> some pictures the other day, at http://www.motovidia.com/MILL%20pics/,

> which showed a Z axis knee, with a ballscrew, and to keep the knee
> from falling through gravity, he had to mount a 150 lb. gas spring
> from the knee to the base, to balance it. I wonder if the tendency of
> the knee to fall, can be overcome by using a ball screw with a greater

> number of TPI?
>
> Marv Frankel
> Los Angeles
>
> ----- Original Message -----
> From: "Tim Goldstein" <timg@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, November 21, 2002 4:43 PM
> Subject: Re: [CAD_CAM_EDM_DRO] SeriesII Quill Zaxis CNC addon ideas:
> Like Jon E's?
>
>
> > Marv,
> >
> > The only downside of doing it with an acme screw is the wear.
> > Carrying
> that
> > much weight and moving it all the time will likely yield an
> > inconsistent pitch in a relatively short time. Besides, on my
> > machine it was already equipped with the ground screws from the
> > factory.
> >
> > Tim
> > [Denver, CO]
> > Sherline products at Deep Discount (now Mach1 CNC controller too)
> > www.KTMarketing.com/Sherline
> >
> > ----- Original Message -----
> > > Tim
> > > If you size your motor properly, with the right gearing, is
> > > it
> > really
> > > necessary to convert the knee to ballscrew? It seems to me, with
> > > that
> much
> > > weight on the screw, the original acme screw would have virtually
> > > no
>
> > > backlash. Gravity would take care of it. If we could figure out
> > > how to
> put
> > > the same amount of tension on the x and y axes, we would probably
> > > never
> > have
> > > to concern ourselves with their backlash. Aren't we doing almost
> > > the
> same
> > > thing with pre-loaded nuts?
> > >
> > > Marv Frankel
> > > Los Angeles
> >
> >
> >
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> 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.
>
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> 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
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DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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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.
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