8mm Forum: ST1200HD Belt Blues

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Topic: ST1200HD Belt Blues

Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted December 30, 2014 09:36 AM

Hi All,
Well this picture above would not be a big deal normally, except for one thing.....
The belt is less than a month old [Smile]

The weird thing is that the belt does NOT seem 'cheap' to me and is from a reputable belt seller(that many use here)....
So this leads me to wonder if perhps putting a new belt on will yield similar results. I am 99.9% sure the belt was installed correctly. It worked great for a month, but I only played maybe 20-30 films only.....
Any thoughts??
Cheers,
Matt
PS: Thank Goodness I still have my trusty St180, or I may have gone through Super 8 Withdrawal!!!!

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Cheers,
Matt 📽

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Steve Klare
Film Guy

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

posted December 30, 2014 10:01 AM

Could just be a defective belt. (Nobody, and nothing is perfect!)

The belt material seems to be broken on an angle and a clean cut, just like the splice that made a loop out of it wasn't properly glued.

Why not contact the seller and see what he says about it?

-and let us know what happens.

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

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Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted December 30, 2014 02:41 PM

Could be Steve. That pic i posted could have been clearer i suppose, and closer to show that it actually wasn't a very clean break. Almost the kind of break as if you stretched it until it snapped. I already ordered a new belt this morning(from who you recommended in another post and from whom i got the counter belt from 'isellprojectorbelts'), so i am anxious to receive that.
I wonder if anyone has had success glueing them. I tried with loctite super glue earlier and it seems to be strong again, so maybe for fun while i await the newer belt, i can see how long it might hold, or not... [Smile]

Cheers,
Matt

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Cheers,
Matt 📽

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted December 30, 2014 04:50 PM

Test the drive by hand Matthew while the belt is off to see if the drive is all free to turn with no "binding or tight spots".

You will have to do this in all modes to fully test.

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"C'mon Baggy..Get with the beat"

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted December 30, 2014 08:39 PM

Belts that have been stored for quite a few years, can as shown just fall apart. That stuff does have a shelf life.

What I have done for all my projectors, including the Bauer 35mm, platter drives as well as with Super8 machines, is to buy EPR O-Rings "Ethylene Propylene Rubber" bought over the counter at Seal Imports here in the city. The staff will measure your old one and match it to the large range they have in stock.

Those EPR seals are "very cheap" to buy and have good grip. People do buy them for all kind of applications....might be worth checking out locally.

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted December 30, 2014 10:46 PM

Ethylene-Propylene rubber is an excellent material for o-rings or rubber belts. It is noted for its long life, very wide operating and storage temperature range, and its resistance to many common greases and lubricants. Another superb material is Butyl B612 rubber. Both these materials are commonly used in the most stingent applications of military electronics and mechanical hardware. I replaced the belts of my Bolex 18-5 with Butyl rubber o-rings over 20 years ago, and they still look and run like new. I think the problem here is poor choice of material.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted December 31, 2014 09:15 AM

I think these are great ideas! Than very much.
I never realized we could try different materials.
I wonder if there is any sort of place similar to Seal Imports here in Hamilton, Ontario.
I will do some research!!
Cheers,
Matt
PS: I also want to eliminate any seized parts that could be causing this....

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Cheers,
Matt 📽

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted December 31, 2014 01:10 PM

Mathew, get in touch with Parker Seal Corpn. They manufacture and distribute thousands of O-ring sizes in a wide variety of materials, including EP and Butyl. If you look at their catalog you will certainly be able to find an O-ring that will fit perfectly on your projector.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted January 09, 2015 10:13 AM

Just to update this 'project, i wanted to mention that with the 'super-glued' belt, I was able to watch exactly 1.5 400' reels [Smile]

(so 600' approx). That was all before it broke!!!
Anyways, I have ordered another belt and am waiting for that, and have not yet looked into the oring, but will also do that and i will report here any 'local' distributors in case anyone else in these parts wants a stronger belt solution.

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Cheers,
Matt 📽

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted January 09, 2015 01:00 PM

Have you definitely eliminated any possible "Binding" throughout the drive chain Mathew?
This question has no bearing on your repaired belt snapping almost immediately Matthew as it is almost impossible to repair a belt once snapped.

[ January 10, 2015, 04:11 AM: Message edited by: Andrew Woodcock ]

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"C'mon Baggy..Get with the beat"

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Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted January 10, 2015 01:29 AM

Hi Andrew,
Call me Matt! My full name is actually Mathew, with one 'T', but I do prefer Matt best, unless you are mad at me, then you should call me Mathew, like my mother does when mad [Smile]

What i did was turned by hand the moving parts the belt is associated with, and it 'seems' to move freely. Is there anything else i can try to be sure? Thanx,
Matt

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Cheers,
Matt 📽

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted January 10, 2015 03:46 AM

Apologies Matt for the two "T's". No I am sure all will be fine then once you fit a decent belt such as the ones suggested by Paul. Just make sure the alignment between pulleys is also spot on when fitting your new belt as this also can cause problems with premature wear

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"C'mon Baggy..Get with the beat"

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