Re: Sherline Auto Tool Changer (mill/drills too!)

--- In CAD_CAM_EDM_DRO@yahoogroups.com, ccq@x wrote:
> Yo Peter;
>
> To address your problem, and no doubt that of others putting their
own gear
> together, there are such things as, "compressor mufflers", sorta
like the
> muffler on a car. A storage tank shouldn't be a problem. Part of
the
> compressor noise problem, is the valve clatter. One way around
this would be to
> use fluidic valves, one on the input line, and the other on the
output. Having
> no moving parts, a fluidic valve makes no noise.
>
> Bill
>
>
> On Tue Jan 28 06:22:02 2003 Peter Cruickshank <crankshaft_sg@y...>
wrote:
>
> >Hi Ballendo;
> >
> >Well, if you ask for my wishlist it would be this..
> >
> >We are (all ??) hobyists, so to make it ourselves would be fun,
> >challenging and of course much cheaper, so I would of course opt
for
> >the plan with the option to buy certain parts which we can't or
> >don't want to make !!
> >
> >I live in a small apartment in Singapore, and one thing I don't
have
> >and can't have is an air compressor running in here, I would be
out-
> >of-here in minutes if I had compressor humming and vibrating my
> >neighbours, so air is out of the question for me unless it's a
small
> >12 volt compressor with no storeage cylinder !
> >
> >Other that that, a 3/8" shank, (well actually a 10mm shank for
> >everyone but the US !) would be more than adequate for the
sherline
> >and the work which will go through it.
> >
> >8 Tools is more than enough, 6 would be enough for me, I could
> >probably get away with less than that if it were to simplify or
> >reduce the cost !
> >
> >Hope that helps, I understand that you may want to protect your
> >design, but I would be interested how generically you have planned
> >to go about this ??
> >
> >Cheers !
> >
> >peterC
> >
> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo <ballendo@y...>"
> ><ballendo@y...> wrote:
> >> Peter,Sherline CNC'ers, mill/drill CNC'ers,
> >>
> >> I've got one worked out that I'm positive will work. Not too
> >> difficult to make, either...
> >>
> >> Now I'm wondering what someone would be willing to pay for an 8
> >tool
> >> autochanger for the sherline 5000 series mills? Is 8 tools
enough?
> >>
> >> Max diameter of toolshank is 1/2, but limiting this to 3/8 would
> >> prob'ly make things less expensive overall. Is 3/8 shank
> >limitation
> >> okay? Or must 1/2 shank tools be accomodated? What (shank)size
> >> holders do you NEED?
> >>
> >> Shop air would be needed, so is requiring an air compressor okay?
> >>
> >> Do you want to buy it complete, or make it from plans/kit?
> >>
> >> What would you be willing to pay for a complete, bolt on unit?
> >> A kit of parts?
> >> Plans?
> >> Which of these three options is most "real" for you?
> >>
> >>
> >> If you make it, you will need the sherline lathe also (or some
> >other
> >> lathe of similar capability) Is this going to be a problem? If
so,
> >> would you be interested if the kit had the lathe parts already
> >made?
> >>
> >> BTW, no mods to the mill need be made... This is a bolt-on-and-
go
> >> item.
> >>
> >> The unit I have designed will scale to mill/drill operation as
> >well:
> >>
> >> Same questions as above, but max shank diameter can easily be
1/2.
> >Is
> >> 5/8 necessary ?
> >>
> >> The lathe parts could probably still be made on a sherline, but
a
> >7x
> >> or 9x size would make things easier...
> >>
> >> So sherline and Mill/drill users, please let me know what your
> >> answers to these questions are???
> >>
> >> Thank you in advance,
> >>
> >> Ballendo
> >>
> >> P.S. Reply offlist, if you want to preserve your "lurk status"
> >here<G>
> >>
> >>
> >>
> >>
> >>
> >>
> >> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Cruickshank
> >> <crankshaft_sg@y...>" <crankshaft_sg@y...> wrote:
> >> > Ballendo;
> >> >
> >> > Now, we're getting somewhere !
> >> >
> >> > Hmm, you're right, the sherline collet is 'handy' cos it ready
> >made
> >> > and seems like the logical choice, but the spindle locking and
> >> > undoing the holder is a problem, you're right that it would be
> >very
> >> > difficult to undo, that was at the back of my mind, I guess I
> >just
> >> > did not want to acknowledge it !!!
> >> >
> >> > The current morse 1 taper limits the collet and cutter size as
> >it
> >> > assumes that the cutter will locate inside the spindle, but
> >there's
> >> > no reason why an adaptor can not fit on the end on the spindle
> >and
> >> > interface to a quick change tool, I think there would still be
> >> > sufficient Z travel even with an adaptor on the end of the
> >spindle.
> >> >
> >> > We have gone through the first rule of troubleshooting which
is
> >to
> >> > elimante what it isn't (can't be done) now we only have to
find
> >> what
> >> > can - so it should be plain sailing from here on in :-)
> >> >
> >> > PeterC
> >> >
> >> >
> >> >
> >> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo
> ><ballendo@y...>"
> >> > <ballendo@y...> wrote:
> >> > > Terry,
> >> > >
> >> > > Most fully automatic changers use a similar technique.
> >> > >
> >> > > Tools are held in vee-shaped non locking single taper
holders.
> >> > There
> >> > > is a retention knob at the top of the holder, which is the
> >small
> >> > end
> >> > > of the vee shape. Fingers inside the spindle are designed to
> >> > capture
> >> > > this knob and pull it upward (often using belleville washers
> >for
> >> > > the "drawing in" force). The interior of the spindle is
shaped
> >so
> >> > > that thes fingers lock in a failsafe way (as long as the
> >> retention
> >> > > knob doesn't break of where it screws into the holder...
Yes,
> >it
> >> > > happens).
> >> > >
> >> > > To change tools, hydraulic or air pressure is used to
compress
> >> the
> >> > > belleville washers, which drops the fingers a bit, which
> >allows
> >> > them
> >> > > to come out of the failsafe recess, which lets them release
> >the
> >> > > retention knob, which allows the holder to drop out (into a
> >> > > waiting "transfer arm", or into the lazy susan itself.
> >> > >
> >> > > Hope this makes sense,
> >> > >
> >> > > Ballendo
> >> > >
> >> > > P.S. Do a search of "CAT 40 holder", to see one of these
> >holders
> >> > >
> >> > >
> >> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "James Owens"
> >> > > <wotisname@l...> wrote:
> >> > > > Hi Peter,
> >> > > >
> >> > > > This is the bit I'm asking about. I'm a where how manual
> >change
> >> > > millers hold
> >> > > > the tooling/holder in place. I have a Bridgeport type
> >machine.
> >> > The
> >> > > question
> >> > > > is how do auto-changers, when they are fully automatic,
hold
> >> the
> >> > > tooling in
> >> > > > the spindle. I can change a tool in a few seconds but I
have
> >to
> >> > be
> >> > > there to
> >> > > > do it. So if it is necessary for me to tighten a draw-bar
> >why
> >> > use an
> >> > > > auto-changer when the tooling held in a lazy-susan would
do?
> >> > > >
> >> > > > > The sherline tool holder simply screws into the spindle
on
> >a
> >> > high
> >> > > > > precision thread & shoulder. There's a 3mm hole in the
> >tool
> >> > holder
> >> > > > > which allows you to locate in the holder to unscrew it.
> >> > Sherline
> >> > > > > claim that as the thread and location hole for the
cutter
> >> > shank
> >> > > are
> >> > > > > created without removing the piece from the machine,
that
> >the
> >> > > > > accuracy is very high !
> >> > > > >
> >> > > > > I know that full size CNCs use a draw bar to pull the
tool
> >> > holder
> >> > > up
> >> > > > > against the taper and locate it onto a dog, but I am
> >trying
> >> to
> >> > > think
> >> > > > > of a way of using the existing available stuff.
> >> > > > >
> >> > > > > Another way would be to make an adaptor to fit the
Spindle
> >> and
> >> > > then
> >> > > > > make special tool holders to fit the adaptor.
> >> > > >
> >> > > > Regards,
> >> > > >
> >> > > > Terry
>
> --