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- To: owner-atm@shore.net
- Subject: BOUNCE atm@shore.net: Non-member submission from [Dave <davel@nojunk.cc.usu.edu>]
- From: owner-atm@shore.net
- Date: Thu, 29 May 1997 21:39:21 -0400 (EDT)
>From atm-owner Thu May 29 21:38:38 1997 Received: from shore.shore.net (root@shore.shore.net [192.233.85.136]) by aquarium.shore.net (8.8.5/8.8.5) with ESMTP id VAA01748 for <atm@aquarium.shore.net>; Thu, 29 May 1997 21:38:33 -0400 (EDT) Received: from barney.usu.edu (barney.usu.edu [129.123.1.89]) by shore.shore.net (8.8.3/8.8.2) with ESMTP id VAA29420 for <atm@shore.net>; Thu, 29 May 1997 21:38:20 -0400 (EDT) Received: from liddell.usu.edu (rm212.geol.usu.edu) by cc.usu.edu (PMDF V5.0-5 #11556) id <01IJGC2U1ZMK9ZLFT2@cc.usu.edu> for atm@shore.net; Thu, 29 May 1997 19:38:17 -0600 (MDT) Date: Thu, 29 May 1997 19:36:39 -0600 From: Dave <davel@nojunk.cc.usu.edu> Subject: Truss Balancing To: atm@shore.net Message-id: <338E2F27.3EDA@nojunk.cc.usu.edu> MIME-version: 1.0 X-Mailer: Mozilla 3.0 (Win95; I) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Hi, I have a question about balancing truss scopes. I have built one that is relatively slow (f6.2) so there is a fairly long moment arm above the altitude bearings. When the scope is positioned at less than 45 degrees above the horizon, it wants to rotate to the horizontal. Is there any way to eliminate this tendency without resorting to weights on the mirror box? I've checked the archives and have seen suggestions to increase bearing diameter (the bearing is equal to the mirror diameter, 12.5"), reduce teflon pad size to increase the loading (currently at 15#/inch), and increase the distance between the teflon pads (they have a 90 degree separation). Any other suggestions? Thanks, Dave Remove 'nojunk.' spoiler from address to reply by e-mail.
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