[modeleng] Re: milling chuck
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 28 Dec 2008 17:13:54 -0800 (PST)
When I was in school, our Bridgeports were equipted with collets and they were
O.K. When I set up my own shop, I made a special MT-3 milling cutter holder
that is secured in the spindle by a drawbar and the cutter is firmly held in
the holder by a Pinch screw. The holder has a .375" hole and I am presently
restricted with using cutters with .375" shanks, and I have a good selection of
them. If, in the future I need to hold cutters of different shank diameters,
well, that will give me another turning project or two! So--there is an
alternative to either collets or Jacob-type chucks. BTW: for the present time,
all my milling projects are done on the Lathe, BUT, I am longingly looking at a
Micro-Mark Vertical Mini-Mill that has a MT-3 spindle----.
Happy New Year to all!!
Al Messer
--- On Sun, 12/28/08, Ron Head <ron.head@xxxxxxxxxxxxx> wrote:
> From: Ron Head <ron.head@xxxxxxxxxxxxx>
> Subject: [modeleng] Re: milling chuck
> To: modeleng@xxxxxxxxxxxxx
> Date: Sunday, December 28, 2008, 6:00 PM
> Hi Dennis
> All I can say is that I've never had a cutter slip.
> Any overload just results in the belt slipping on the drive
> pulley. We 'ME's (or at least, most of us)
> don't work our cutters anything like as hard as they do
> in industry!
>
> Regards
> Ron
> ----- Original Message -----
> From: Dennis Rayner
> To: modeleng@xxxxxxxxxxxxx
> Sent: Sunday, December 28, 2008 7:40 PM
> Subject: [modeleng] Re: milling chuck
>
>
> Hi Ron,
> Thanks for getting us back on thread - I thought there
> might be a bit more
> mileage in this one. When I first started vertical
> milling, as I said
> before, I hadn't a clue. I put an endmill in a Jacobs
> chuck and off I went -
> result was the battered Dore Westbury with the scored
> table as the cutter
> unscrewed itself from the chuck without me noticing. It
> seemed to me that
> the cutter needed more than just friction to stop it
> being pulled out. I
> have bought a complete imperial set of #2MT collets from
> ARC Europe but only
> with work holding in mind. Is it really viable to rely on
> the friction grip
> of a 4-jaw collet ( when I know that the friction grip of
> a 3-jaw Jacobs
> won't do) rather than having the cutter positively
> screwed into a thread
> within the collet with friction only needed to stop it
> rotating within the
> collet?
>
> Regards
> Dennis
>
> ----- Original Message -----
> From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Sunday, December 28, 2008 6:38 PM
> Subject: [modeleng] Re: milling chuck
>
>
> > Hi Jem
> > Several years ago, I too fitted a Vertex chuck to my
> Dore-Westbury (I
> > think the chuck was called a Posilock - in reality a
> poor man's Autolock).
> > In practice, I found the thing too unwieldy. Apart
> from being a real pain
> > to use, it wasn't very accurate, and it put the
> cutter 3-4 inches further
> > away from the spindle bearings, magnifying any
> runout and making the whole
> > thing very 'whippy' due to the small
> spindle.
> >
> > I went back to using Myford 2MT collets directly in
> the spindle socket,
> > and sold the Vertex chuck. I know this limits me to
> cutters of 1/2" shank
> > diameter, but for the sort of work I do, it
> isn't a problem.
> >
> > Regards
> > Ron
> > ----- Original Message -----
> > From: JEM HARRISON
> > To: modeleng@xxxxxxxxxxxxx
> > Sent: Friday, December 26, 2008 11:54 AM
> > Subject: [modeleng] Re: O/T Christmas greetings
> >
> >
> > Merry Christmas and a Happy New Year to all
> modeleng@freelists.
> > Â
> > Dennis,
> > Â
> > Good to know that someone else has a battered D-W !
> > Â
> > I bought a Vertex (which I gather is a Clark type),
> probably from
> > Chronos. It comes in a nice box, with three
> collets and a wopping great
> > spanner.....but no instructions. At least a
> flat-pack from IKEA comes
> > complete with pictograms...a vast improvement on the
> martian tomes that
> > accompany electronic gadgetry. Would-be model
> engineers are assumed to
> > know how to fit/strip/use tools and attachments
> safely and successfully.Â
> > Oh, yes?!
> > Â
> > The Vertex chuck is, I think, well made, and I
> would recommend it. My
> > only reservation would be that I wonder if other
> designs of milling chuck
> > might be more suitable for the D-W.
> > My current project, heading for the scrap-bin, is a
> pair of cylinders for
> > the Paul Forsyth 'Jersey Lilly' design in
> Gauge 1. I purchase two slot
> > drills (one-sixteenth and one-eighth)from Chronos to
> mill the steam ports,
> > but I found that they are not long enough to engage
> with the nipple in the
> > chuck, and if they were, I would never get the
> darned things out! Chronos
> > have kindly agreed to exchange the slot-drills for
> the long series, but I
> > am still waiting for them to arrive.
> > Â
> > I suspect that there are other milling chucks more
> suitable for small
> > machines, but I have no experience of them. I did
> wonder about trying the
> > ER25 collet chuck, but a problem I find with this on
> my lathe is that if I
> > remove a work piece from it and re-insert it, it
> does not run true, so I
> > have to undo the chuck and rotate the workpiece
> several times before it is
> > as near as dammit.
> > Â
> > Nothing is straight-forward in this game!
> > Â
> > Best wishes,
> > Â
> > Jem Harrison
> > Basildon UK
> > --- On Fri, 26/12/08, Dennis Rayner
> <dennis.rayner@xxxxxxxxxxxx> wrote:
> >
> > From: Dennis Rayner
> <dennis.rayner@xxxxxxxxxxxx>
> > Subject: [modeleng] Re: O/T Christmas greetings
> > To: modeleng@xxxxxxxxxxxxx
> > Date: Friday, 26 December, 2008, 10:46 AM
> >
> > Santa was good to me - he brought me a book on
> milling (never had any
> > training in my life) AND spending money!
> >
> > I've come to the conclusion that I should
> replace my old Clare chuck with
> > a
> >
> > new one for my rather battered Dore-Westbury.
> >
> > I wondered if any of the (UK?) group members had
> any recomendations as to
> > make /model/suppliers?
> >
> > The D/W has a #2 MT fixing.
> >
> > Thanks in advance for any advice.
> >
> > Dennis
> >
> > MODEL ENGINEERING DISCUSSION LIST.
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>
>
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