[modeleng] Re: Piloted "D" Bits?

Yes Al, but you don't make them like an ordinary D bit - Face your piece 
of steel, drill for a plot pin, now slab off two sides almost to the pin 
hole, forming a 'blade', now back off both sides of the blade to form 
cutting edges, 'arden and temper it and away you go. I'll send a sketch.
Allen Messer wrote:
> I need to spotface/counterbore a seat for some bolts that cannot be done by 
> commercial tools as they are too short to reach.  I have made and used "D" 
> Bits before, but I have never heard of a piloted one.  Have any of you 
> gentlemen ever made such a tool?  Any advice greatly appreciated.  TIA
>
> Al Messer
>
>
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