8mm Forum: Elmo shutter wheel belt?

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Posted by Daniel Beijar (Member # 1577) on October 31, 2010, 11:41 AM:

Hello!
I came across this ad on e-bay for a "shutter wheel belt" for Elmo super 8 projectors. As I am the owner of an Elmo projector I wonder if all such projectors have this shutter wheel belt. Because my projector don't have one and seems to work just fine without it. I can't even see any trace of there ever being a belt around the shutter. Do I need to purchase a shutter wheel belt or can I run it without one?
http://cgi.ebay.com/ELMO-ST-1200-ST-1200D-ST-1200HD-SHUTTER-WHEEL-BELT-/290405688507?pt=LH_DefaultDomain_0&hash=item439d8724bb

Posted by Jean-Marc Toussaint (Member # 270) on November 01, 2010, 06:04 AM:

Daniel, these were added to the HD and HDMO series, supposedly for a better clutch between the reubber rollers and the shutter wheel. They turn to goo. You can run your projector without them.

Posted by Tom Photiou (Member # 130) on November 01, 2010, 07:40 AM:

This item was never done as a spare part, i believe Robin Moss has an item that did this job however, i have recently purchased an imaculate Elmo 1200 HD magnetic only and the belts were knackard, i replaced these and into the first 200ft of film the rubber around the shutter went,
The best thing to do is get the old rubber off and use it without it. they work fine.
You have to be carfull removing the old though as the edge of the shutter is quite easy to damage or mis-face.
John White at the 8mm shed shop can have your old one lightly skimmed giving it a flat metal surface for a better contact but you would need to contact john through his web site for a price. If you can remove the shutter and send it to him the cost will be greatly reduced, Its great and works brilliantly. I got mine back up and running yesterday and its 1st class. [Wink]

Posted by Steve Klare (Member # 12) on November 01, 2010, 09:54 AM:

I have an ST-1200HD which doesn't have the rubber around the shutter wheel. As far as I can tell there is no slippage as the result of it being gone.

I'm continuing to look into the low frame rate issue and I thought slippage at the shutter wheel was the problem. I ran the machine and dragged a finger tip on the shutter wheel. Instead of the wheel/roller slipping the motor belt started to bend in on one side from the load.

As far as I can tell this is a problem of the bearings being harder to turn when they are cold and as they warm up the machine gradually speeds up towards 24FPS and gets at least close enough. If I let the machine run while I am rounding up films it's fine. From a dead cold start...obviously slow.

Give me a DC motor with an electronic speed regulator any day. Those machines are probably stiffer when cold too, but the regulator just supplies more torque to compensate until they are up to temperature.

Posted by Jim Schrader (Member # 9) on November 01, 2010, 10:43 AM:

I have a 1200HD that had this happen to the rubber melted off while playing it was extremely noisy but ran I sent it to Rence Camera Service & General Repair in Michigan and i could not believe how quiet this thing is now.

Posted by Ted Wilby (Member # 296) on November 01, 2010, 12:04 PM:

I threw my HD away when everything suddenly turned to goo inside. I didn't know any better. It had splashed all around inside though to. It was gooy everywhere. It would have been a real job to clean it up.

Posted by Daniel Beijar (Member # 1577) on November 04, 2010, 09:05 AM:

Thank you for your answers. Since my projector seems to work fine without the rubber belt, I think will leave it that way. The Elmo projector is the most hi-tech projector I have ever own. For example I didn't at first realize that the automatic threading was electronically controlled since all my other projectors are more mechanical in their construction than the Elmo is.

Posted by Barry Fritz (Member # 1865) on January 19, 2011, 06:46 PM:

I'm kinda late to this post, but I have had the tarry goo mess with a number of projectors..primarily Sankyo and Bolex. Tried different solvents to remove it and found the best by far is laquer thinner. I moisten cotten swabs and the goo wipes right off. The usual precautions apply when using solvents...Adequate ventilation and no flames. Also, I do not dispose of the swabs in the waste basket. I put them in a metal container. No spontaneous combustion problems that way.

Posted by Josef Grassmann (Member # 378) on January 21, 2011, 06:18 AM:

Shutter wheels without rubber coating have thicker rim and grinded for smooth running.
Rubber coated shutter wheels have thinner rim as they are press formed from sheet material same thickness as shutter blades. After rubber coating they were grinded.
If you remove rubber coating ( as it changed into soft, sticking rubber) the press formed rim will cause vibration. Now it´s runing noise is louder compared to earlier shutter wheels without rubber coating.

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