[modeleng] Re: Piloted "D" Bit

Al

By George, I think he's got it !  (Misquoting a well known phrase from -
IIRC - "My Fair Lady"

Glad we could assist.

Regards
Andy
-----Original Message-----
From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
On Behalf Of Allen Messer
Sent: 28 July 2007 15:11
To: modeleng@xxxxxxxxxxxxx
Subject: [modeleng] Re: Piloted "D" Bit

EUREKA!  Now I can see it!  It will look like a
Woodworkers flat "paddle bit" with a pilot instead of
a sharp spur!  Many thanks, Gents!!

Al
--- TEL <tel@xxxxxxxxxxx> wrote:

> This is right Al - time to look outside the box.
> What you are actually
> making is a two bladed end mill with a 'ole in the
> end for the pilot pin.
> I've made several over the years and they work a
> charm.
> 
> 
> > Thanks, John & Andrew!  Since "D" bits are the
> only
> > type of cutting tools I've tried to make, I guess
> my
> > mind had settled into a rut.  Thannks for the good
> > advice.
> >
> > Al
> > --- Andrew Houston <andrew@xxxxxxxxxxxxxxxxx>
> wrote:
> >
> > > Al
> > >
> > > Not when I've made 'em.  Can't see why you think
> it
> > > should.
> > >
> > > If we are talking counter-boring tools they are
> not
> > > usually "D"-bits.
> > >
> > > A counter-bore bit is usually made by
> > > filing/grinding each side of the
> > > material, so that the end looks like a fat
> > > flat-bladed screwdriver with a
> > > round hole in the middle.  Each of the end
> cutting
> > > edges is then given
> > > clearance appropriate to the material being
> > > counter-bored.
> > >
> > > Easier to describe with a picture !
> > >
> > > If you really want to mimic commercial piloted
> > > counter-bore bits, you can
> > > turn down the pilot pin so that the small
> diameter
> > > is inserted into the bit
> > > and the larger section forms the actual pilot. 
> In
> > > practice, they work
> > > perfectly well without going to this trouble.
> > >
> > > Andy
> > >
> > > -----Original Message-----
> > > From: modeleng-bounce@xxxxxxxxxxxxx
> > > [mailto:modeleng-bounce@xxxxxxxxxxxxx]
> > > On Behalf Of Allen Messer
> > > Sent: 28 July 2007 00:41
> > > To: modeleng@xxxxxxxxxxxxx
> > > Subject: [modeleng] Re: Piloted "D" Bit
> > >
> > > Thanks for all thge advice---I had not thought
> of a
> > > separate pilot.  One question though: does the
> part
> > > of
> > > the pilot that mates with the flat on the "D"
> bit
> > > have
> > > to be filed to half its diameter?
> > >
> > > Al
> > > --- Patrick Coppens-Marian Lynch
> <develop@xxxxxxxxx>
> > > wrote:
> > >
> > > > Al,
> > > > Just a thought.
> > > > Drill a hole were the pilot should be,slightly
> > > under
> > > > the size of the pilot.
> > > > Before quenching it, insert pilot in the hole
> > > > (separate piece)
> > > > The pilot will be held by the contraction of
> the
> > > > metal, and will not
> > > > warp, as it was never heated...
> > > >
> > > > Cheers
> > > > Patrick
> > > >
> > > > Allen Messer wrote:
> > > >
> > > > >I need to make a "D" Bit with some extra
> reach to
> > > > it
> > > > >in order to counter-bore some Allen head bolt
> > > seats
> > > > in
> > > > >a hard to reach place.  I plan to make it out
> of
> > > > >Silver Steel and harden it.  How  it is
> possible
> > > to
> > > > >make one wherein the "pilot" won't warp
> during
> > > the
> > > > >hardening process?  I've tried it a couple of
> > > times
> > > > >and the pilot wants to warp when quenching
> out.
> > > > TIA
> > > > >
> > > > >Al Messer
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
>
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