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Topic: Eprad Mut dancer arm oscillation
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Ian Parfrey
Phenomenal Film Handler
![](/ubbmembers/5122b.jpg)
Posts: 1049
From: Imbil Australia 26 deg 27' 42.66" S 152 deg 42' 23.40" E
Registered: Feb 2009
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posted 04-17-2009 05:12 PM
Hi Everyone.
My Eprad double mut I have here is doing some strange stuff and I'm hoping someone out there may be able to help. The problem appears intermittant and random. Both feed and payouts work ok upon starting a show, even with 42" spools, but once going, the takeup dancer arm starts to oscillate for no apparant reason. When the oscillation starts, there is usually a loud "clunk" from the takeup gearmotor on acceleration and the ballast lamp lights brightly for a few seconds. The gearmotor then slows down, then accelerates and the cycle continues, each time the oscillations reducing in amplitude until it settles down and runs ok for about 2-3 minutes where the cycle start over. Payout is not affected and runs fine and dandy.
So, where do I start? Ive cleaned the variac windings and wiper, tightened up the chain to the variac shaft, adjusted the cam so it activates just on the cam-rise and checked the ballast lamps- both of which are fine. I have found a bit of lateral play in the variac shaft, maybe this could be the cause?
What would cause the dancers to start oscillating? Would the "clunk" coming from the gearmotor indicate a stuffed gearmotor?
Im not sure if the electro-caps have been changed, or even if this could be responsible for this problem. Ill change them anyway.
This things starting to worry me.
Thanks for any advice anyone can give. Cheers Ian
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