[ATM] Whiffle Tree cell using 'Swivel Leveling Mounts'?

[Thomas A Simmons <tasimmons@Raytheon.com>]

Larry,

  Not so long ago I would have said these are the best thing since
sliced bread. That was before I read the patent issued to Richard
Schwartz (you can get to it below)

>"Tom Krajci" <tkrajci@san.osd.mil> wrote:
>
>> Please check out:
>> http://overton.tamu.edu/aset/krajci/
>> Specifically:
>> http://overton.tamu.edu/aset/krajci/scope-design.htm
>> And:
>> http://overton.tamu.edu/aset/krajci/cell-bearing.htm
>> For some info on compliant hinges (and astatic cells) I've put together.

  In a nutshell, how do you estimate the force required for the
bearing to begin to move in order to equalize the force. If you can't
model this, how are you assured that each of these points are not
contributing to mirror deformation?

Tom
Tucson, AZ
PS-search ATM archive under "compliant"

Date: Tue, 13 Apr 2004 18:58:36 -0400
From: "Lawrence Sayre" <lsayre@neo.rr.com>
Subject: [ATM] Whiffle Tree cell using 'Swivel Leveling Mounts'?
To: "The Amateur Telescope Makers List" <atm@atmlist.net>
Message-ID: <opr6e3fycvs5tvhu@smtp-server>
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Is it possible to mount each of the floating "upper level" triangles of a
27 point cell on 'swivel leveling mounts'?  I was thinking of JBWelding
swivel level mount heads to the undersides of each of the 9 upper level
triangles, right at the nominal balance point of each.  Will these offer
enough non-binding freedom of tilting movement for the upper triangles,
while not permitting much if any excess side to side slippage?  The ones
in the McMaster Carr catalog are claimed to be good for up to 15 degrees
of tilt (in every direction I assume).  Page 1214 on the online catalog.
What do you think?

Lawrence Sayre
--

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