8mm Forum: Should I replace Shutter Belt on ST-1200?

This is topic Should I replace Shutter Belt on ST-1200? in forum 8mm Forum at 8mm Forum.

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Posted by Dan Lail (Member # 18) on July 24, 2009, 04:09 PM:

I have a new shutter wheel belt for my ST-1200. Should I replace the worn one or totally remove what is left of the old and run it as is and not installing the new belt?.

BTW this has nothing to do with Diana Dors. [Big Grin]

Posted by Tony Stucchio (Member # 519) on July 24, 2009, 05:28 PM:

Huh? If you remove the belt the shutter won't turn, right?
[Big Grin]

Unless you have a model with 2 belts -- but I assume that if it was designed for 2 belts, both are needed.

Posted by Graham Sinden (Member # 431) on July 24, 2009, 05:36 PM:

Dan, are you talking about the belt rubber that goes around the edge of the shutter wheel?

Posted by Dan Lail (Member # 18) on July 24, 2009, 06:19 PM:

Graham & Tony, sorry 'bout that. Yes, it is the rubber belt that is attached to the shutter wheel.

Posted by frank arnstein (Member # 330) on July 27, 2009, 09:53 AM:

Hi Dan
I have successfully run a number of ST 1200 Elmos without any Shutter belts and had no ill effects at all. They went fine.
Provided all traces of old rubber is removed from the shutter edge and also from the rubber drive wheels, then it will run very well without the shutter belt. They must be bone dry though.
They are very quiet machines after removing a noisy, bumpy old rubber shutterbelt. They sound & run like new again.
The only way to clean the rubber goo off thoroughly is to dissolve the rubber remnants with Brake Cleaner evaporative Spray. Don't inhale it though. Watch for fire too. It is easily inflamable by a single spark.
Sometimes the spring that tensions the drive wheel against the shutter, needs a bit of shortening to provide sufficient pressure to ensure good traction.
Give it a go and see how it works....Let us know the result.
dogtor pufferfish [Wink]

Posted by Graham Sinden (Member # 431) on July 27, 2009, 11:13 AM:

But Dan, Frank take note that if you remove the rubber from the shutter wheel and run it without then it does change the speed slightly (makes it faster I believe). Not all ST1200's were designed with the rubber I believe as later units didnt have it but Elmo probably made the shutter wheel slightly bigger to compensate. Mabye someone else can clarify that.

Overall I would say you're better off running the ST1200 without the shutter belt because when it melts into goo, they are a BL***Y NIGHTMARE [Frown]

.

Graham S

Posted by Dan Lail (Member # 18) on July 27, 2009, 07:49 PM:

Okay everyone I have removed the old belt and ran a film to hear the sound. It is a tad faster, but now annoying. The projector ran smooth too. Anyway I installed the new belt to hear the difference in the sound. Ahhhhhhhhh, right on pitch. I believe it runs a bit quieter too. Thanks everyone for great info.

Posted by frank arnstein (Member # 330) on July 28, 2009, 07:37 AM:

Dan,
Can you tell us what was involved in installing the shutter belt?
Did it require major dismantling or was it easily fitted in situ?
dogtor pufferfish
[Roll Eyes]

Posted by Graham Sinden (Member # 431) on July 28, 2009, 11:51 AM:

Dan, where did you buy this belt from?

Posted by Dan Lail (Member # 18) on July 28, 2009, 01:04 PM:

Frank,

It didn't require any dismantling. I took the rear cover off of the projector and also removed the lamp cover on the front. There is no armature on the back side of the shutter wheel so that is where I approached the wheel. Using a small jewelers flat head screw driver I carefully pushed the belt behind the wheel. Then I took two 10" pieces of 14 gauge electrical wires( I slit the wire open and took out the insulated black wire and white wire and threw away the ground). I removed about an inch of insulation from each wire and bent the copper to form a right angle hook. These wires became the tools I used to maneuver the belt onto the shutter wheel. I used one wire from through the back and at the same time one through the front and managed to slip the belt onto the wheel.

Posted by frank arnstein (Member # 330) on July 28, 2009, 11:13 PM:

Dan,

I believe those belts need glueing onto the shutter.
Did you use any contact adhesive, like tarzans grip?

dogtor pufferfish [Confused]

Posted by Dan Lail (Member # 18) on July 29, 2009, 02:23 AM:

Frank, I didn't use any glue. There was some black residue left from the old belt so maybe it will stay on.

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