Author
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Topic: Bolex 155 Macrozoom help!
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted April 29, 2011 01:20 PM
Yes, there is actually something easy you can try that has a decent chance of working (-Have this camera, had this problem, did this fix).
These are good cameras, but since they are among the earliest Super-8 cameras ever (1967ish?) they are kind of prehistoric technology-wise. They regulate the motor speed by having a switch mounted spinning on the motor shaft. When the shaft spins just fast enough the centrifugal force opens up the switch and slows the motor until it closes and lets it speed up again. It's like driving your car at a (nearly) constant speed by moving your foot on and off of the gas pedal instead of holding it steady. It's as simple as a stone axe, but just as effective.
The thing is to conduct current to this whirling switch you need two commutators to connect it to the motor. These are copper, which means they oxidize, which becomes a lousy electrical conductor, which means your motor can't go.
If you run the camera often, they clean themselves. If it sits on a shelf a while the oxides build up and here we are.
(This is exactly what happened the first time I used mine.)
What to do about it:
Find the screws that hold the black plastic hand grip on, remove them and the grip. The commutator/regulator/switch…thing is inside. Being careful of the brushes that ride on them (they are delicate), polish the two commutators with a pencil eraser until they are shiny again. Turn the motor shaft to get all 360 degrees of the commutator surfaces.
With any luck you should be back in business again.
-------------------- All I ask is a wide screen and a projector to light her by...
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