Subject: Re: square drill bit???

From: [email-masked] (Gregory Clark)
Date: 22 Mar 1995 23:46:10 GMT

>In <[email-masked]> [email-masked] (Bob Powell) 
>writes: 
>
>>
>>
>>>>>A friend claims that there is a drill bit that can drill a square
>>>>>hole.  He can't explain how it works, he just keeps insisting that
>>>>>such a thing exists.  Is he completely wacky?
>>
>>While on this subject, what makes the hex-shaped holes in the
>>heads of an Allen-drive fastener?

For woodworking, the drill that cuts square holes is simply
a forstner bit mounted inside a square broach. The drill 
removes the bulk of the material and the broach is pushed 
through the hole behind the tip of the drill. The broach
is kept from rotating by a bar that clamps to the column
of the drill press. For metal you use a broach and an arbor
press and do it after you've drilled the pilot hole. 

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*Your ideas are my own.                 [email-masked]*                                       *
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