8mm Forum: ST-1200 Drive Rolls

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Topic: ST-1200 Drive Rolls

Lawrence Alan Fabbri
Junior
Posts: 6
From: South Lyon Michigan USA
Registered: Mar 2005

posted April 04, 2005 08:45 PM

Glad to back on the Forum and thanks Kevin for the help registering. I have an Elmo ST-1200 that would not go forward or in reverse most of the time. After removing the back cover it seems that a spring was missing that pulled the drive wheels against the shutter blade. I carefully examined the projector for the spring. It does not seem like there ever was a spring there, no witness marks or scratches. I installed a spring that I had and it seems to work fine. I have not run it except to test it and was wondering if I am on the right track. The spring does not have much tension and it seems to work pretty good. If it does require a spring is there somewhere I can get the right one. The Elmo is in near new shape with hardly any wear on the rubber drive rolls and the belts look almost new. I am thinking be that the unit has seen little use because of this missing spring. Thanks Larry

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted April 04, 2005 11:11 PM

Hi Lawrence - we haven't met before but, well, glad to have you back [Big Grin]

Just wondering, were you having the same problem in both the 18fps and 24fps positions, and is your (temporary) solution affecting both speeds in the same manner as well? I don't really have the whole assembly before my mind's eye right now but I have a feeling there's a connection there...

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Call me Phoenix. *dusts off the ashes*

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Lawrence Alan Fabbri
Junior
Posts: 6
From: South Lyon Michigan USA
Registered: Mar 2005

posted April 05, 2005 07:57 PM

Hi Jan
The spring is pulling the drive wheel assembly towards the shutter wheel. It is the assembly that has the 18 and 24 drive rolls on it that is changed with the lever that is on the back. I hope my description helps. Thanks Larry

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted April 05, 2005 10:01 PM

That's right! I knew there were two rubber rollers but forgot each one was for a different speed plus they can reverse direction (along with the motor). For some reason I was thinking of the way Bell & Howell designed their assemblies: there are two rollers as well but they only go one way (the motor does not reverse) and one roller pushes against the outside of the shutter wheel rim making it go forward whereas the other roller pushes against the inside of the rim making the shutter wheel go in reverse.

Oops. [Cool]

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Call me Phoenix. *dusts off the ashes*

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