8mm Forum: ST-1200 belt keeps slipping off!

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Topic: ST-1200 belt keeps slipping off!

Christian Bjorgen
Jedi Master Film Handler

Posts: 996
From: Kvinnherad, Norway
Registered: Oct 2009

posted March 02, 2013 03:23 PM

Houston, we have a problem!

I was just watching my 3x400 "Superman" digest, and suddenly I turn to find a pile of film on the floor. Guess what? The take-up reel had stopped again!

This is the third time now that this has happened since I got the machine last week and it annoys me. Is this an issue that others here have experienced?

What seems to happen is that at random intervals the belt slips off the wheel driving the take-up reel, and falls "behind it", so that I have to loosen the entire drive wheel to fasten it again. And after a few hours, it's off again!

Any ideas?

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Well who’s on first? Yeah. Go ahead and tell me. Who. The guy on first. Who. The guy playin’ first base. Who. The guy on first. Who is on first! What are you askin’ me for? I’m askin’ you!

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Pasquale DAlessio
Film God

Posts: 3523
From: Bristol,RI, USA
Registered: May 2010

posted March 02, 2013 03:39 PM

Is the belt too lose? Is the pulley bent even the slightest at all?

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 02, 2013 04:33 PM

Will our hero reach the bridge in time to stop the train?

(Sorry, Pat!)

I think this belt is supposed to be square in cross section. Is yours?

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All I ask is a wide screen and a projector to light her by...

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Pasquale DAlessio
Film God

Posts: 3523
From: Bristol,RI, USA
Registered: May 2010

posted March 02, 2013 04:40 PM

quote:
I think this belt is supposed to be square in cross section. Is yours?

No, I'm hip man!

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Christian Bjorgen
Jedi Master Film Handler

Posts: 996
From: Kvinnherad, Norway
Registered: Oct 2009

posted March 03, 2013 04:46 AM

Looks fine and square to me, no bent pulleys and the belt is not loose as far as I can tell.

Looks like this:

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Well who’s on first? Yeah. Go ahead and tell me. Who. The guy on first. Who. The guy playin’ first base. Who. The guy on first. Who is on first! What are you askin’ me for? I’m askin’ you!

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Vidar Olavesen
Film God

Posts: 2232
From: Sarpsborg, Norway
Registered: Nov 2012

posted March 03, 2013 04:59 AM

On mine, it looks like this is closer to the wheel (so the belt won't have chance to slip off. Only thing I can see that differs a bit from mine

I think it's just to loosen that screw on it, twist it a little towards the beltwheel and tighten it again

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Jean-Marc Toussaint
Film God

Posts: 2392
From: France
Registered: Oct 2004

posted March 03, 2013 05:10 AM

Is this an early version of the ST1200 ? light-blueish frame ? It's a common incident that's also happening on early ST600s and SC18s.Especially with recent belts sold over the net, which indeed seem a bit loose.
I've seen a modification added to the machine in form of a small nylon roller pressing on the top path of the belt. Home made thingy, so if you know your way around tools and find a small roller, either chrome or nylon, that's not complicated to do.
You also have to check the assay attached to the take-up arm. As far as I remember, there's a washer made out of cork. When this wears out, the pulley tends to move slightly side to side.
The easiest way around all this is to get belt material and create a tighter belt. Not too tight, you don't want to block thetake-up. Hope this helps.

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The Grindcave Cinema Website

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Christian Bjorgen
Jedi Master Film Handler

Posts: 996
From: Kvinnherad, Norway
Registered: Oct 2009

posted March 03, 2013 05:25 AM

The problem, Vidar, is that the belt slips the other way and ends up "behind" the wheel on the right. Will see if I can get some DYI-tricks sorted for it [Smile]

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Vidar Olavesen
Film God

Posts: 2232
From: Sarpsborg, Norway
Registered: Nov 2012

posted March 03, 2013 03:17 PM

Oh well! After replacing belts yesterday, mine has come with weird sounds and it's the same belt as you have problems with. It just starts squeaking and the belt goes soft on top, but I can not see what should obstruct it ...

Oh, well, I think I'll send it to complete overhaul if the guy has time :-)

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Roger Shunk
Jedi Master Film Handler

Posts: 604
From: Phoenix, AZ
Registered: Nov 2011

posted March 03, 2013 05:32 PM

I have a spring belt on my ST-1200? I was told the last production run on the Elmo's they put spring belts on.

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Bill Phelps
Phenomenal Film Handler

Posts: 1482
From: USA
Registered: Jan 2009

posted March 03, 2013 06:19 PM

I recently had the same issue with the take up moving very slow and not winding the film up tight on my ST1200...The belt didn't appear to be loose or slipping by looking at it but I replaced it and that did solve the problem.

Bill [Smile]

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