[modeleng] Re: Releasing chuck taper

Hi JEM and Ron,

Occasionally the #2 morse taper in my lathe tailstock gets something with a
mating taper stuck in it. The taper is blind and does not have a slot. I
have had some luck with gently tapping on the side of the stuck item for a
few minutes up to an hour with a small copper hammer. The many small blows
will eventually dislodge the stuck item without any damage. I think it's the
vibrations that do it. It seems a better approach than escalating heavy
force blunt trauma, which is tempting but usually results in grief of some
sort. The tap tap tap takes patience though.

As Ron said a smear of WD40 on everything is beneficial.

Cheers Jeff Dayman Waterloo Ontario (making conrods for the steam roller
today)
----- Original Message ----- 
From: "Ron Head" <ron.head@xxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, February 18, 2007 1:06 PM
Subject: [modeleng] Re: Releasing chuck taper


> Hi Jem
>
> I too have a Dore-Westbury, and like yourself, I had to make a special
> drawbar with a step in it.  In fact I had to make two, because some of the
> 2MT attachments I use have an M10 thread in them.  When I want to release
> the tool I'm using (usually a flycutter) I just give the top of the
drawbar
> a smart smack with a copper mallet and the whole thing drops out into my
> other hand.  The problem comes when I've been using a Jacobs chuck because
> there is no ejection slot and no drawbar.  In this case I just drop a
length
> of brass rod down the spindle and give that a smack.
>
> I've never had a taper stick, but then all my tooling tends to be covered
in
> WD40 to keep rust at bay.
>
> I don't use a milling chuck. I tried a thing called a Pozilock (a poor
man's
> Clarkson) but found it too unwieldy, I much prefer to use Myford collets
to
> hold my milling cutters.  With the sort of cuts I take, they never slip
and
> the whole thing is much more rigid because the head is nearer to the job.
> Horses for courses, I suppose.
>
> Regards
> Ron from Oxford
>
> ----- Original Message ----- 
> From: "JEM HARRISON" <jemharrison@xxxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Sunday, February 18, 2007 1:27 PM
> Subject: [modeleng] Releasing chuck taper
>
>
> > Gentlemen
> >
> >  Yesterday, I thought that I would try to make a simple (!) drilling
jig,
> > by drilling some holes accurately in a piece of 6mm thick mild steel
that
> > I had machined in the ML10 to fifteen-sixteenths of an inch square.  The
> > next step would be to hold that piece of steel in the nippy vice on the
> > old, very old, Dore Westbury mk.1, but before I could do that, I had to
> > remove the Clarkson type milling chuck so that I could install the drill
> > chuck that is normally installed on the tail-stock of the lathe.  The
fun
> > is about to start.
> >
> >  The Clarkson type milling chuck, a Vertex, is on a Morse Taper No.2,
and
> > has a tapped hole in the end, 3/8" Whitworth for a drawbar.  As the bore
> > through the spindle of the DW is smaller than 3/8", I had to make a
> > drawbar from 5/16" ms, plus an adaptor (5/16" - 3/8").  I had removed
the
> > milling chcuk from the DW once before, and it had needed some
persuasion.
> > Even more persuasion was needed this time.  I tried hitting the top of
the
> > drawbar (protected with a piece of wood) with a small hammer, then I
tried
> > a bigger hammer, then i tried hitting the drawbar directly with the
> > hammer, only to damage the thread on the end of the drawbar.  After
> > re-cutting the thread with a 5/16" die, I put extra nuts on the top of
the
> > draw bar, and belted these with the heavier hammer.  The morse taper
would
> > still not shift.  Finally, I took the drawbar out and squirted WD40
around
> > the top of the milling chuck and down the bore of the spindle.  After
> > leaving the WD40 to penetrate for five
> > minutes, I put the drawbar back in, gave it a tap, and the chuck morse
> > taper released quite easily.
> >
> >  Is there an easier way to remove a stubborn morse taper?
> >
> >  Jem Harrison
> >  battling with basics in Basildon, Essex, UK !
> >
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> >
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