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This topic comprises 3 pages: 1 2 3
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Topic: Polishing the sound drum
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Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 08-15-2001 12:44 PM
Mark, there is a possibility that the reason why I was told this was because if they polished themselves so bright through years of service, the scanner drums might take a goofy wear pattern and run askew. It makes sense to me. And, I agree about the idea they might slip a little more on start-up than usual, and since that is on the leader, it is no real big deal. It is all equalized proir to changeover, unless the bearings feel like someone poured poly-grip into them. Personally, I never really cared for the cushion (impedance) rollers. I have seen some of them build up so much crud that the crud was hammered into the emulsion side of the film. They bounced, and just literally ran funky. The felt rollers were a disaster for that. The squirrely rubber rollers were not much better. Even if those were kept clean, you could still see railroad track smudges on the emulsion side of the film after many runs of the print. The solid rubber ones seemed to fare much better. All they left was a BIG WIDE railroad track. Unfortunately, operators forget to clean the rollers and guide flanges on a regular basis. Some of those scanner drums get really bad! Even Buzz-Track was all over the place...especially if the guide flanges and the scanner shaft bearings were less than perfect. The scanner drum Josh and I did looked good when we finished. It was almost a basket case when we started, but now it has has a smooth (but not glossy) machined looking surface. I think it will be OK. It still had some small rust specks in it, but those will polish out eventually. I have seen some in service that look much worse that what he has now. I forgot to take my micrometer and a run-out indicator with me, so I could not check it for "wooga wooga's" or other defects. It was a "fly-by-the-seat-of-the-pants" type of repair. If for some reason it is out-of-round, there is a good machine shop in his area that could square it up for him without too much trouble. The only thing he might have to re-do is the sound focus. Paul
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