PSN-L Email List Message

Subject: Re: Lehman construction
From: George Harris gjharris@.............
Date: Mon, 10 Jan 2000 22:31:06 -0500


It is important that the point and the dimple are properly matched.  That is,
the point must be sharper than the angle on the dimple.  Flexure pivots are
much better.  It may not be possible to get much better operation out of
point/dimple pivots.

George Harris


> Gentlemen,
> Well, things seem to be going along quite nicely,  but I think I've hit a
> roadblock.  I can now setup the boom for a very repeatable 11sec period,
> but I just can't seem to coax anymore out of it.  I've tried tilting the
> base with the front screw and bringing the rear boom pivot point closer to
> the vertical plane of the wire pivot.  Just doesn't seem to want to slow
> down any more than about 11sec.
> I am using a 1/2" dia.  threaded brass boom,  with a sharpened point on the
> pivot end.  This point is pivoting in a VERY small dimple at the end of a
> 3/8" bolt.  I even tried applying a small amount of lube to the pointed
> pivot,  in an attempt to reduce any friction.
> Any suggestions?
> Jim Martin
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