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Topic: Elmo ST1200
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted September 08, 2005 03:19 PM
Kev, if the metal rollers are such a problem on the ST1200, how come the GS1200 has all metal rollers and not plastic ones. I have noticed that my GS1200 metal rollers stop spinning very quickly, even after cleaning the pin and inside diameter of the rollers. Also the version 1 had a black plastic roller at the film channel input, later to be replaced by a metal roller in version 3. So what gives here? Did Elmo decide metal rollers were better than plastic? I would have thought that plastic rollers would be the way to go, since they are self lubricating and have a very low coefficient of friction. Now that I think about it though, this whole buisness of the spinning roller is quite complicated. You want a slippery material for the roller so that it spins easily on the pin and is self lubricating. But if the roller material(or film) is too slippery then the film will just skid across it and the roller will not spin. Sounds like the best solution is a metal roller with a teflon or Delrin plastic insert for the pin bearing internal surface. That way you have a high friction coefficient on the film bearing surface (to aid spinning) and a low friction coefficient on the pin bearing surface.
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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