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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> > 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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> Moderator: jmelson@... timg@... [Moderator]
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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
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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>