PSN-L Email List Message

Subject: Re: Wire & Metal Flexure Information
From: Brett Nordgren brett3nt@.............
Date: Fri, 11 Jun 2010 16:47:17 -0400


Hi Jerry,

That's a very useful article--new to me.  Thanks for sharing the link.

One general comment:  While crossed-flexures such as those described 
in the article have very low torque and can be quite useful in a 
vertical instrument, for horizontal Lehmans and garden gates you 
could probably get away with a single thin (0.002"?) flexure clamped 
on edge with a length (gap between the two rotating parts) of 0.020" 
or perhaps even less.  Its only effect vs the crossed-flexure design 
would be to require the tilt of the instrument to be changed very 
slightly to get the desired period, as the stiffer flexure would be 
providing a part of the restoring force normally provided by 
gravity.  And a single short flexure is likely to be much more rugged 
than a crossed-flexure pivot.

Regards,
Brett

At 11:18 AM 6/11/2010, you wrote:
>Here is an interesting article about flexures that may be of 
>interest to the group.
>http://www.aspe.net/publications/Annual_2005/PAPERS/5FLEX/1859.PDF
>
>Regards,
>Jerry


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