[modeleng] Re: Piloted "D" Bit

Hi Al,

No, it can be left full diameter as it only serves to act as a guide for 
the cutter itself.

John

Allen Messer wrote:
> 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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