To: "John Sherman" 
From: ray{at}stabilite.com (Ray Desmarais)
Cc: atm{at}shore.net
Reply-To: ray{at}stabilite.com (Ray Desmarais)


Hi All,

slings work ok on thicker mirrors.
On realy thin mirrors they are bad, even with slipery surfaces. I'm sure It
works fine on your mirror John. on the realy big thin mirrors It does not
work. I tried teflon contact points on a 67", 1.5" thick and the
72" and they were bad no matter how much I fussed with it.I had used
slings for years in the past.
RAY
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>Hi Tom,
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>>My concern with slings is friction/stiction.  Some sling users need
>>to jostle or bump the mirror cell because of the sling system.  That
>>is a sure sign that friction/stiction is at play.
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>Yes, but what I found is that the sticky friction problem is because of the
>cell, not the sling. I was making the 18 support points out of cork, as
>recommended by someone. The mirror sticks to the cork, so it doesn't move
>when the sling stretches or shrinks. Now I use hard plastic furniture
>sliders, and the mirror moves freely with the changing sling tension (I
>think they're nylon).  No large pinching or shear forces now. Teflon sliders
>would be better, but the ones I have seen are soft and squishy -- don't want
>that, your collimation would go all over the place.
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>John
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Ray Desmarais
479-890-4918
ray{at}stabilite.com

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