PSN-L Email List Message

Subject: Re: "C" Spring Seismometer
From: ChrisAtUpw@.......
Date: Wed, 8 Nov 2006 20:23:14 EST


In a message dated 2006/11/08, gmvoeth@........... writes:

http://www.fairpoint.net/~sparksite/CSpring%20Seismometer.html 

> Isn't that hack saw blade a kind of leaf spring and a similar idea would be 
> a torque-tube spring.

Hi Geoff,

       I think that this is one of Roger's older designs. A newer version is 
shown at http://mariottim.interfree.it/doc02v_e.htm but I think that Roger now 
uses magnetic damping.

       You do need to buy hacksaw blades which are hardened right through. 
The ordinary ones only have the edge strip with the teeth on it hardened. You 
also need to grind the teeth and the wavy backing off. If you don't, the blade 
will be noisy and will eventually crack at one or more of the teeth / waves.  

       PSN seems to be OK. Can you revert to an older tested version of MSIE?

       Regards,

       Chris Chapman
In a me=
ssage dated 2006/11/08, gmvoeth@........... writes:

http://www.fairpoint.net/~sparksite/CSpring%20Seismometer.html

Isn't that hack saw blade a kin= d of leaf spring and a similar idea would be a torque-tube spring.

Hi Geoff,

       I think that this is one of Roger's old= er designs. A newer version is shown at http://mariottim.interfree.it/doc02v= _e.htm but I think that Roger now uses magnetic damping.

       You do need to buy hacksaw blades which= are hardened right through. The ordinary ones only have the edge strip with= the teeth on it hardened. You also need to grind the teeth and the wavy bac= king off. If you don't, the blade will be noisy and will eventually crack at= one or more of the teeth / waves. 

       PSN seems to be OK. Can you revert to a= n older tested version of MSIE?

       Regards,

       Chris Chapman

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