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Author
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Topic: Film tension question
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Jon Miller
Jedi Master Film Handler
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Posts: 973
From: San Diego, CA, USA
Registered: Sep 1999
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posted 01-07-2003 11:30 PM
John Hazelton wrote... quote: Alternatively, any reason why one couldn't put a rheostat or variac or something on the motor and ramp up the start speed? I'd love to have some little circuit that engages when the handle is pushed over, and slowly starts the rewind, so the film gets gentler treatment.
I have one of those Goldberg beasts, which I retrofitted with a ceramic wirewound resistor (unfortunately I do not recall the exact value, but I think it's a 10-ohm, 20-watt unit) in series with the motor's start windings to soften the start, a la old RCA 1040 soundhead. The rewind now takes about one second to ramp up to speed.
The back tension is kind of a pain to set...unfortunately, I can't get it loose enough to avoid cinching the film pack without the automatic shutoff mechanism getting hypersensitive on me (and this is with an NOS clutch disc). Maybe I should just bypass the auto-shutoff stuff.
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