Hey Scott,

If the problem IS torsional, when does it occur? Assuming that the
undesirable motion is torsional, does it occur during traverse, or
when the telescope is "touched". If it occurs during traverse at the
start of swing and then again during stopping of swing, is it possible
to put a reverse force collar under the existing, so that the head is
"counter-balanced"? IE an equal mass counter-rotating?

Take care.

Brian Lawson,
Bothwell, Ontario.
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On Tue, 4 Nov 2003 18:24:39 +0000 (UTC), domain
(qedude) wrote:

I'm hoping someone can help me with a problem I am having. I have a telescope
mounted on a 54 inch tall, 3/16 inch wall, 8x8 square aluminum tube with 1.25
inch plates welded to the top and bottom and bolted to 2/3 of a yard of
concrete. The problem is I am getting a little too much movement out of the
tube and I need to increase the stiffness of the tube. The ideal situation
would be to replace the tube with something larger but that's just not possible
at this point in time. I don't need a radical increase in stiffness either so I
think there is something I could do to for a slight increase in stiffness. I
need to kill low frequency vibrations so please don't suggest sand or concrete,
beside concrete and alumimun don't get along with each other. Any ideas ? Would
putting the tube under tension help ?


Scott Hogsten