Re: [ATM] Best locations for 4-Pt. Wiffletree edge support PLS.

["Jan van Gastel" <jhm.vangastel@wanadoo.nl>]

Maybe a wiffle tree of two sets of two rollerbearings instead of teflon? I
have good results with two rollerbearings instead of my original piano
wires. While collimating (if more the a tiny adjustment was necessary) the
mirror would 'hang' on the teflon heads of the piano wires. The  bearings I
use now do not have that problem. So maybe it is a good solution here as
well.

Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/
----- Original Message ----- 
From: "Nils Olof Carlin" <nilsolof.carlin@telia.com>
To: "Bob Drew" <gofast3@hotmail.com>; <atm@atmlist.net>


> Teflon pieces or similar against a rough glass edge won't make it,
> of course. With a sturdy wire cable (inside a low-friction sheath), at
least
> you know it is strong enough by a very large margin...
>
> More specifically, as you say "The saw is ready to hit the metal", what
have
> you in mind?
>
> If you solve the friction problem, using symmetric wiffletrees supporting
at
> +-22.5 and 67.5 deg will give you a load distribution somewhere between
the
> 2-point +-45 deg support and the (somewhat better) 180 deg sling - there


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