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This topic comprises 2 pages: 1 2
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Topic: MUT Tension Problem
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Scott Balko
Expert Film Handler
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Posts: 136
From: Redwood Falls, Minnesota, USA
Registered: Apr 2000
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posted 02-06-2003 09:23 PM
Tom, I too have the XNR-335 platters and the Xetron Mut you are referring too. There is no tensioner on the drive belt, but check to see if the belt is too tight. If it is, this will put excessive drag on the supply reel. The bearings on the reel spindle are sealed, so if one of those is tight, you will have to replace it. Also, when you turn the knob to start the platter motor, don't give it too much all at once. Bring the speed up gradually. Hard acceleration will spin the center ring in the film roll and tighten the roll every time you start winding another reel. This problem gets worse the more reels you have on the platter as the sheer weight of the roll will resist enough to allow the platter to spin under the film. The mut takes a 3L-400 belt. While it gives nice free feed to the platter, it sucks for tear-down as it will bearly pull the last couple of reels off. I use a 3L-390 belt for teardown, but you have to leave the motor a little loose or belt tension will be too much and you'll either smoke the motor or the bearings. Hope this helps.
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Tom Doyle
Expert Film Handler
Posts: 176
From: Bristol, CT, USA
Registered: Nov 2002
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posted 02-09-2003 08:21 PM
Ok, I get the idea - no WD-40. When I asked our theater's former projectionist about sticky rollers, this is what he advised. I did ask in the above post what I should use to lubricate rollers, but no responses - well, what do you use? All we have in the booth is Century projector oil. I use this for the intermittant and sprockets, but I assume this is a bit on the heavy side for rollers?
This is a sub-run theater, so no chance of us scrapping the old tables for new ones.
Scott, thanks for the tips! I believe the belt is a bit on the tight side, but I did not find any adjustment for it. This was pretty much what I was asking about. I'll be more mindful of the acceleration - perhaps this will help, and I'll have to check over the spindles when I have free time at work. (We use two tables, and both seem to give the same results. Luckily, we have a third for parts.)
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Paul G. Thompson
The Weenie Man
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Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 02-09-2003 08:54 PM
If the rollers have sealed bearings, the answer is nothing. On open-case bearings, I have used a light application of projector oil, and never had any problems with it. Some people use light weight non-detergent motor oil, but I have mixed feelings on that. Some use graphite, and I have mixed feelings on that, too.
So, unless someone has a better idea that makes sense, I'll stick to projector oil.
If you are running a Christie that has no bearings in the rollers, don't lubricate them. If they get stuck, just remove the c-clip from the shaft, remove the roller, use a "Q" tip and warm soapy water to clean the bore. Rinse when done, and don't forget to clean the shaft.
I understand that many cleaning chemicals will damage the Christie rollers, but nobody ever told me what to use and what not to use. Even rubbing alcohol will damage some types of plastic.
WD-40.....HAH! When Regal bought us, in marched a case of WD-40! When the person who brought it into the booth left, I marched the whole case right straight out the door and heaved it in the trash masher.
Roger, now you know what happened to that case when you guys bought Southsound in Port Orchard........
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