[modeleng] Re: milling chuck

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. 
>   > 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
>   >
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