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Bolex jam


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#1 SoundGuy

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Posted 29 March 2006 - 07:30 PM

Greetings.

I recently unearthed a Bolex SBM camera and ran a dummy roll of film through it. The spring motor seemed to work fine, but I found that after threading the camera and engaging the spring motor, after about 7-8 seconds the film loops became rigid, causing the camera to jam. Essentially, the loops were lost.

Why is this happening?

Thanks in advance.
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#2 Clive Tobin

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Posted 29 March 2006 - 09:40 PM

I recently unearthed a Bolex SBM camera and ran a dummy roll of film through it. ...the loops were lost.


Did you use the normal automatic threading, or did you thread manually by opening the sprocket shoes? If the latter, did you forget to close them again? Normally you only open these up with the locking slider thingy if you have to thread manually because of using the 400' magazine.

If that isn't it I would say the upper sprocket must not be turning properly. A claw problem would lose the lower loop only, with the upper loop getting larger not losing it, and the automatic loop restorer should take care of this within a few frames.
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