Re: [CAD_CAM_EDM_DRO] Z Axis Mechanical Layout Options - Bridgeport M Head

Graeme,
One of the other guys in the group posted this link, with
pictures of his project, and I thought you might be interested. From the
pictures, it looks like he could raise a battleship with the size of the
motor, pulleys, and timing belts.

Marv

----- Original Message -----
From: "Graeme Murray" <graemem@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, November 20, 2002 2:20 AM
Subject: Re: [CAD_CAM_EDM_DRO] Z Axis Mechanical Layout Options - Bridgeport
M Head


> Hi Marv,
> I will take some and get them away as soon as poss.
> Maybe tomorrow
> Regards Graeme
> ----- Original Message -----
> From: "Marv Frankel" <dcdziner@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, November 20, 2002 12:04 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Z Axis Mechanical Layout Options -
Bridgeport
> M Head
>
>
> > Graeme,
> > I haven't started the retrofit on my Enco mill (8 X 36) yet,
> but
> > I'm interested in your Z axis solution. If you can, either post the
photos
> > on the Yahoo Group site, or send them to me directly.
> >
> > Thanks,
> > Marv Frankel
> > Los Angeles
> >
> > ----- Original Message -----
> > From: "Graeme Murray" <graemem@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Monday, November 18, 2002 10:30 PM
> > Subject: Re: [CAD_CAM_EDM_DRO] Z Axis Mechanical Layout Options -
> Bridgeport
> > M Head
> >
> >
> > > Hi Mark ,
> > > I bought a clone mill (FIRST with 50 x 10 table) a couple of years
ago.
> > It
> > > had been retrofitted with SERVO Products controller and 3 axis drives.
> > > When I bought it it wasn't fully working. Had a couple of electronic
> > > problems which the folk at SERVO gave me wonderful help with and I was
> > able
> > > to fix.
> > > However the Z axis had been adapted locally with a mixture of tooth
> belts
> > > and gears ( they had done a frightening amount of work to produce a
> crappy
> > > result) to drive the quill pinion and it was not working and the
> previous
> > > owner seemed to have had continuing problems with it.
> > > From bits and pieces I had learned from this group and elsewhere I
> decided
> > > this approach was not for me, so I started from scratch and built a
> quill
> > > drive using a screw positioned where the depth stop screw was fitted .
> > > There was a retrofitted mill at my place of work so I was able to have
a
> > > good look at it , though I did not copy it exactly. I had room to fit
a
> > > double tooth belt drive to the screw which enabled me to mount the
motor
> > > vertically at the side and with a second short belt turn the drive at
> > right
> > > angles and drive the screw. This enabled me to keep the block mounted
> on
> > > the front of the quill short and consequently reduce the cantilever
> > effect.
> > > I used a piece of acme screw material (good quality stuff) and a
> matching
> > > bronze nut. I cut the nut in half and built an adjustable anti
backlash
> > nut
> > > assy. At the time this cost $96 NZ which was about 1/6 of the cost of
a
> > ball
> > > screw and I wanted to be sure things worked.
> > > Of course , guess what I found in a second hand machinery dealers shop
6
> > > weeks later .... a brand new 16mm ballscrew with nut the right length
,
> > for
> > > $160NZ !!! So I now have that stowed away for insurance .
> > > However that was nearly 2 years ago and the Z-axis has been working
fine
> .
> > > About 1.5 thou of backlash last time I checked, but I can live with
that
> > for
> > > the work I have been doing.
> > > I did manage to stuff up one particular time and drove a cutter
straight
> > > down into a block of plastic when the motor was still switched to
manual
> > and
> > > didnt run.
> > > Broke the belt and gave me a heck (I'm trying to be polite) of a
fright
> .
> > > However a new belt fixed it and didnt do any other damage.
> > > I can email you some photos if you like . Perhaps I should tune myself
> in
> > to
> > > how to put pics on the group files . It is much easier to follow on a
> > > picture.
> > > I definitely would not consider driving the quill rack and pinion
> though.
> > > Backlash can be a major pain and the rack has not been designed for
> > > measurement accuracy, that comment comes from guys way back on the
list
> > and
> > > others ,not just me.
> > > If I can help lets know
> > > Regards
> > > Graeme
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "natchamp_87" <mark@...>
> > > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > > Sent: Tuesday, November 19, 2002 12:31 PM
> > > Subject: [CAD_CAM_EDM_DRO] Z Axis Mechanical Layout Options -
Bridgeport
> M
> > > Head
> > >
> > >
> > > > Well, I got my new (to me!) BP M head mill. I have already started
> > > > taking it apart for the clean up, ball screws, etc. One of the
> > > > things I have not resolved is the best way to accomodate the Z axis
> > > > travel. I am hoping someone can shed some light on the best way to
> > > > accomplish this.
> > > >
> > > > If I move the quil, it appears there are a couple ways to do this.
> > > > 1) mount a motor to turn the same shaft as the hand lever. This to
> > > > me has a problem of very long travel for a given rotational travel
of
> > > > the motor, unless I severly under drive the pulley which still might
> > > > not be enough?
> > > > 2) mount a motor to turn the fine feed shaft and worm gear. This
> > > > would fix the long travel per motor rotaion in 1 but the worm gear
> > > > isn't fixed to the shaft, it works on friction. I could key-way the
> > > > worm gear onto the shaft? This, to me, seems like the best approach
> > > > for moving the quil.
> > > >
> > > > If I move the knee I would need a bigger motor and could still under
> > > > drive to address the higher torque required. However, there doesn't
> > > > appear to be any good mounting locations for this method.
> > > >
> > > > Can anybody shed some light on this? I know people have done this
> > > > many times and would love to hear some insight. Thanks a bunch.
> > > >
> > > > Mark
> > > > mark@...
> > > > www.mark.hargett.com
> > > >
> > > >
> > > >
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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.
> > >
> > > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
THEM.
> > DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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> > OFF Topic POSTS: General Machining
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> 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.
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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 THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
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>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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>