[modeleng] Re: Piloted "D" Bit

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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