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Randy, surely the stiffer materials like this only amplify the casting imperfections that you mentioned before? The tripod heads seem smooth and most of the roughness is on the underside of the cast wedge base. With the properties of teflon, all minor roughness of the base is absorbed by one side of the teflon leaving the other side perfectly flat and smooth as the bearing surface on the tripod head. How can a stiffer material possibly do this? CDs etc are a quick fix only and they do work but nowhere as efficiently as teflon. You mention cost which is a fair point, but it is like having quality optics and using cheap eps, you would not do it out of choice, the same goes for this, amplifying the roughness of the wedge with harder materials leads to a knock on effect of your scope base not sitting flat on the tripod thus making it harder to polar align.

Best Regards,

Andy 51.19N

Nil Satis Nisi Optimum

(Nothing's Satisfactory Unless It's The Best)


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Subject: [M]: Re: Re: Superwedge - HDPE vs Teflon for bearing
Date: Fri, 31 Oct 2003 21:29:52 -0800
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Jay,

I mistakenly mentioned HDPE when I meant UHMW (ultra-high molecular
weight) polyethylene. HDPE is used in some packaging like butter tubs
or five gallon plastic pails while UHMW is the hard, slippery
formulation often used for bearing in place of teflon.

I make wedge bearings from UHMW that make the azimuth adjustment much
smoother.

Randy Marsden



----- Original Message -----
Sent: Friday, October 31, 2003 12:31 PM
Subject: [M]: Re: Superwedge - HDPE vs Teflon for bearing


> Randy --
>
> Thanks for the info re HDPE. I may take you up on your offer.
> What's this about "butter tubs" as a source of HDPE?
>
> Jay Lewis
> Passenger & Shipping Institute
> Coral Gables, FL
> USA
> ----- Original Message -----
> Sent: Friday, October 31, 2003 3:16 AM
> Subject: [M]: Superwedge - HDPE vs Teflon for bearing
>
>
> > Andy,
> >
> > I agree that if you use two discs of teflon that the surface
deformation
> > issue is not so important. But since Teflon costs 10-20 times more
the
> > HDPE, and since a single disc of HDPE is necessary to perform the
same
> > job, it seems a waste of money to use Teflon, unless you happen to
have
> > a sheet lying around (care to share if you do?)
> > .
> >
> > Randy Marsden
> >


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