[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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