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From: ee163acp@sdcc13.UUCP (DARIN JOHNSON)
Newsgroups: net.puzzle
Subject: Re: Reuleaux (sp?) drillbit.
Message-ID: <193@sdcc13.UUCP>
Date: Mon, 8-Apr-85 13:21:32 EST
Article-I.D.: sdcc13.193
Posted: Mon Apr  8 13:21:32 1985
Date-Received: Wed, 10-Apr-85 03:43:49 EST
References: <1359@trwrba.UUCP>
Organization: U.C. San Diego, Academic Computer Center
Lines: 20

> 1) What does this drill bit look like? 
> 	
It look like an equilateral triangle with rounded sides.  To be more
exact, these sides have their radii (sp?) at the oppsite vertex.
> 
> 3) Are the corners really really round, or just kind of round?  (How
> round is this Square Hole?) 
> 
> 4) Does it "Really" cut a "square" hole, or is this something that looks 
> good on paper, but can't be built, or done?
> 
Yes it is square and it has been built.  The drill bit allows the
triangle to float freely.  To actually drill the hole, one has to put a
square template so that the bit stays where it is supposed to go.
Without this, the drill will spin around off center and drill a funny
hole if you can manage to hang on to the thing.  It does exist since I
have seen a picture of it and the hole it did somewhere (Scientific
American?).

  Darin Johnson