Gosper, is Julian all pessimistic because the classic spirograph has the rotor rolling around the inside of the stator? Does the problem persist if the rotor rolls around the outside? On Wed, Jun 18, 2014 at 4:23 PM, Steve Witham <sw@tiac.net> wrote:
Date: Mon, 16 Jun 2014 11:54:40 -0400 [in issue 29]
From: James Propp <jamespropp@gmail.com>
Has anyone designed a mechanism that permits the spirographer to focus on circumferential force?
The knockoff product I have, has holes in both parts, suitable for pushing pins through, so in theory you only have to push on the pen tip. Rather than a wax tray the first thing I'd think of would be corrugated cardboard & the second, cork.
I'm imagining something like a latchable/unlatchable zipper.
That's a fascinating idea in itself. It could be used in funicular railways, for instance.
Although the zipper tooth design is asymmetrical, I have a coat that unzips from both ends.
--Steve
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