Re: Unmanned sub crosses ocean
From: Hans-Georg Michna (hans-georgNoEmailPlease_at_michna.com)
Date: 11/29/04
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Date: Mon, 29 Nov 2004 13:28:07 +0100
On Fri, 26 Nov 2004 11:35:20 -0000, "David Lee"
<davidlee_malvern@dont.use.this.bit.hotmail.com> wrote:
>Hans-Georg Michna wrote...
>> when you consider that you need some kind of waterproof gasket
>> for each moving rod that comes out of the fuselage, it may be
>> simpler to have just one.
>You can extract both rotary and linear motion from a perfectly sealed system
>without having to resort to gaskets. The technique uses bellows and is used
>for motion stages in ultra-high vacuum systems (in which case welded
>stainless-steel bellows are used).
>
>Linear motion is obvious - a rod sealed to the bellows is simply pulled in
>and out or rocked from side to side. Rotary motion is a bit more cunning
>and works by "wobbling" the joystick-like drive rod around the perpendicular
>axis, so that it drives a second, internal, loosely coupled rod that in turn
>drives the rotating mechanism. Whilst the ends of the drive-rod rotate in
>circles the rod itself never actually rotates - effectively all is
>accomplished by just rocking the bellows.
David,
interesting. Yes, that would be a possible way to go as well.
Hans-Georg
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