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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!mgnetp!we53!busch!wucs!wudma!ph
From: ph@wudma.UUCP
Newsgroups: net.puzzle
Subject: Rouleaux drill
Message-ID: <233@wudma.UUCP>
Date: Sun, 7-Apr-85 17:10:28 EST
Article-I.D.: wudma.233
Posted: Sun Apr  7 17:10:28 1985
Date-Received: Mon, 8-Apr-85 03:19:34 EST
Distribution: net
Organization: Washington U. in St. Louis, CS Dept. DMA Project
Lines: 27


	A few weeks ago I posted a request for someone out there more
	mechanically inclined than I to explain how the Rouleaux drill
	bit (the one that drills square holes) was driven, since it
	didn't rotate around a fixed axis.  Unhappily all I have
	received in reply is one one-sentence message saying, "Use an
	eccentric chuck and a square template." (I have since lost the
	actual message, so I'm afraid I can't address the poster
	directly.)

	Well.  The use of the template had already been discussed in
	previous messages on the subject, but I must admit to some
	confusion about the eccentric chuck.  If by that you mean a
	chuck which is off-center, surely this would not work; the bit
	would still rotate about a fixed axis, just not the one which is
	its center.  You would end up making a somewhat larger but still
	round hole.  If, on the other hand, you mean the device which I
	have heard called a "free-floating chuck", that's fine but it
	still leaves me in the dark as to how the widget works.

	So once again may I request that someone please explain just how
	it is this magic device works?  Thanks.

						--pH

	P.S.	I apologize in advance for requesting information on a
	subject which really needs diagrams for proper discussion.