PSN-L Email List Message

Subject: Ruby on carbide...a surprise result
From: "meredith lamb" paleoartifact@.........
Date: Wed, 25 Jun 2008 18:22:07 -0600


Hi all,

Yes another S-G pivot test.  This time I tested two round ruby balls on two
flat carbide inserts for undampened
time oscillation duration; which is a rough indication of pivot friction.

The surprise result was that it didn't oscillate near as long as a previous
test using magnetic suspension
of four common steel ball bearings.

http://seismometer.googlepages.com/rubyoncarbide

All this indicates; is that a much overall better pivot, is the three
crossed rods pivot, for alot less friction.

What what little its worth, I also put up another web test page, where
magnetics is used with carbide
crossed rods to somewhat "assist" the pivot rod in its rotational zero
position line aspect.  See:

http://seismometer.googlepages.com/mcrp

Take care, Meredith Lamb
Hi all,
 
Yes another S-G pivot test.  This time I tested two round ruby balls on two flat carbide inserts for undampened
time oscillation duration; which is a rough indication of pivot friction.
 
The surprise result was that it didn't oscillate near as long as a previous test using magnetic suspension
of four common steel ball bearings.
 
http://seismometer.googlepages.com/rubyoncarbide
 
All this indicates; is that a much overall better pivot, is the three crossed rods pivot, for alot less friction.
 
What what little its worth, I also put up another web test page, where magnetics is used with carbide
crossed rods to somewhat "assist" the pivot rod in its rotational zero position line aspect.  See:
 
http://seismometer.googlepages.com/mcrp
 
Take care, Meredith Lamb
 
 
 
 

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