Author
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Topic: Bell and Howell Super 8 projector, model 346A
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David Walcher
Junior
Posts: 6
From: Burnsville, MN, USA
Registered: Jan 2017
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posted February 13, 2017 09:58 PM
I am in the process of trying to get this to work. I have figured out how to repair the spool holders ( for want of the correct term). There is chattering that is not due to the holes in the film. I used to be able to correct that by running the film backwards for a few seconds, but that trick doesn't work anymore. Furthermore, when I try to run the film backwards, it just locks up and doesn't move. I've figured out how to open the machine and the belt is in good shape, I cleaned the metal pieces that seem to be the main drive and the mechanism seems to change from forward to reverse without any problem. I was wondering if there is a repair manual for this machine? Also, any tips from anyone who has worked on this projector would be appreciated. As an FYI. The nylon 2.5 mm screws that held the spool holders onto the arms failed but I was able to find some screws. There was a thin bushing/washer that kept pressure on the gear so that it would turn. That part I was not able to find or replace, but a small compression fitting from a plumbing store, painstakingly hacksawed in half, made a nice repair. two other questions. the larger spools, there are 5 inch and 7 inch. How much film do those hold, in feet? Thank you
-------------------- David Walcher
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted February 14, 2017 02:44 PM
David, I neither know this machine nor have any experience with one, but as assistance is not exactly flooding in so far from your part of the world, from the symptoms you describe in the outset, about the fact it would run better in reverse than in forwards projection mode, it sounds as though your main shaft endfloat may not be set quite right if your shutter cam is attached to it. This causes penetration issues if it has excess movement.
As the machine is switched from forwards to reverse, the claw position due to the cam movement, changes somewhat.
Depending on design of cooling fan etc etc, the thrust of the shaft can work in opposition to what you would expect in some instances.
Try cleaning the cam lobe of hardened grease to begin with if there is any. re lube it with fresh appropriate grease and try to observe any shaft thrust movement in forwards or reverse projection modes. see if the depth of claw penetration changes from running in one direction to another.
You should be able to do all this without the risk of running film through the machine while you still have any doubts about it's well being.
Note:, we are not talking huge differences here by any means, but there doesn't have to be to cause Jitter in the frame. Fractions of a mm can and often do, make all of the difference in the world with 8mm gates.
-------------------- "C'mon Baggy..Get with the beat"
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