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RE: [ATM] dob balance
Lance,
Here is a web page that I put together concerning the balancing of a truss
dob, and the placement of the bearings on a scope. This is specific to my
scope DS-3. Maybe it will help. It is a bit out of date, and doesn't cover
calculating the distance between the teflon pads, but it is still a start.
It also explains how to keep from adding aditional weight to the mirror box.
Alan
http://www.xmission.com/~alanne/DS3Main.html
http://www.xmission.com/~alanne/DS3Bearings.html
>From: "lance clarke" <alaskawolfjoe@hotmail.com>
>To: atm@atmlist.net
>Subject: [ATM] dob balance
>Date: Wed, 06 Jul 2005 09:49:30 -0400
>
>This will likely be obvious to some of you, but I just wanted to make sure
>I get things right.
>
>I've just retrofitted my sonotube dob as a truss dob. The mirror box is
>deep enough to store the secondary cage, so it's easy to break down and
>transport in the car when we go camping. Right now I've got a 5 inch
>diameter alt bearing, and as you can guess it doesn't move as smoothly as I
>would like, and it is also quite succeptible to vibration. I intend to cut
>larger diameter bearings so the alt will be seated much lower and with a
>broader base. These bearings will be arcs, not circles or semi-circles.
>Will this help fix the mentioned problems? As well, and this is what I'm
>much more uncertain about, will my center of gravity change? That is,
>since the bearings are attached below the center of gravity of the OTA,
>will this change the center of gravity? Or does it remain the same as
>before since the bearings are supported?
>
>I hope I've made my question clear.
>
>Thanks
>
>Lance
>Toronto.
>
>
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