PSN-L Email List Message

Subject: A S-G magnetic ball to ball point pivot
From: "meredith lamb" paleoartifact@.........
Date: Wed, 18 Jun 2008 17:20:21 -0600


Hi all,

The alnico web page reminds me of another pivot, where although I don't
presently have a web page to illustrate it; I think
I can text describe such.  Its been covered somewhat before; but that
variety used crossed neodymium rods...
which were certainly terrible for a pivot surface.  Even that arrangement
ended up supporting a 2 pound mass.
Too much mass and of course the boom/mass falls off/down.

Assuming you want a S-G pivot which is a vertical hanging mass.  One could
mount a flat strong neodymium magnet at the
top of the frame.   Mount and glue down two spaced steel or carbide balls on
such.  On the boom facing the
balls mount/glue two more steel/carbide balls with the same spacing.  Mount
the mass on the boom. Click them together.
Thats it!  Simple magnetics and gravity force the pivot to remain in their
fixed points.

Take care, Meredith
Hi all,
 
The alnico web page reminds me of another pivot, where although I don't presently have a web page to illustrate it; I think
I can text describe such.  Its been covered somewhat before; but that variety used crossed neodymium rods...
which were certainly terrible for a pivot surface.  Even that arrangement ended up supporting a 2 pound mass.
Too much mass and of course the boom/mass falls off/down.
 
Assuming you want a S-G pivot which is a vertical hanging mass.  One could mount a flat strong neodymium magnet at the
top of the frame.   Mount and glue down two spaced steel or carbide balls on such.  On the boom facing the
balls mount/glue two more steel/carbide balls with the same spacing.  Mount the mass on the boom. Click them together.
Thats it!  Simple magnetics and gravity force the pivot to remain in their fixed points. 
 
Take care, Meredith
 
 

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