8mm Forum: Strange belt problem

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Topic: Strange belt problem

Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted May 22, 2006 06:13 AM

If anyone is an expert on belts, I'd welcome a comment on this strange problem. I've recently been making use of a Elmo ST-600D, which I had not used for about 9 years. It previously worked fine, but the square motor belt soon broke after I started using it again. I managed to obtain the right Elmo square belt to replace it, and it fitted the pulleys perfectly. However, before long the projector became very noisy and I discovered that the belt was not remaining 'flat' between the pulleys on one side, and all the noise was coming from some sort of vibration that resulted from this. The belt had definitely been applied properly, with no twists in it. I tried moving the position of the lower pulley, but nothing completely cured the excess noise, so I moved it back to where it was initially, in line with the upper pulley. I then tried replacing the belt with a fairly cheap round one that I'd bought as a spare some time ago, and all the noise immediately disappeared.

It seems very odd that the correct Elmo square belt should be so problematic, so I wondered if anyone has ever experienced anything similar, or heard of evidence of a belt that looks perfectly normal turning out to be faulty in some way?

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Adrian Winchester

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted May 22, 2006 07:38 AM

Adrian, I have seen this sort of thing with the GS and the V belt for the main drive.
It seems to me that some of these belts seem to be too stiff resulting in this extra noise.
What I do is to apply a very slight smear of grease to the belt surfaces but not enough to make it slip. This generally quietens it down and allows the belt to wear in.

On the GS's now I use a round section rubber belt and this makes the machines run really quiet jus as you have found. If your happy with the round belt then carry on using it.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted May 22, 2006 09:39 AM

Thanks for the suggestion, Kev. I'm sure that with some belts, on some projectors, there's good reason to have something more sophisticated than a plain round belt, but there seems to be others where there's no obvious improvement in performance, so you wonder what the rationale was.

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Adrian Winchester

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Tony Milman
Phenomenal Film Handler

Posts: 1336
From: United Kingdom
Registered: Jun 2003

posted May 22, 2006 12:58 PM

I have found that the buckle on my belt tends to make a clanging sound as it goes around. Tried the grease but to no avail [Big Grin]

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Tony

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