[modeleng] Re: Piloted "D" Bit

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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