[modeleng] Re: Piloted "D" Bit

Ah, yes, Andy, I've got it now, BUT, since I am a lazy
sort, I made a design change and will now just machine
the top of the "feet" flat and let the bottom of the
cap screws seat flat and let the heads stand proud. 
No real need for counter-boring after all.

Al
--- Andrew Houston <andrew@xxxxxxxxxxxxxxxxx> wrote:

> 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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