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Author
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Topic: Bumping reel
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Kenneth Wuepper
Phenomenal Film Handler
![](/ubbmembers/1174e.jpg)
Posts: 1026
From: Saginaw, MI, USA
Registered: Feb 2002
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posted 11-14-2002 09:46 PM
I recall that RCA made a "fluid Clutch" for their 1600 series 16mm projector takeups. This was a clear plastic housing with fins inside and contained Silicon fluid.The clutches worked very well and the takeup tension was proportional to the speed of the spindle. Too bad there is not a version of this available for the payout spindles. KEN
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Kenneth Wuepper
Phenomenal Film Handler
![](/ubbmembers/1174e.jpg)
Posts: 1026
From: Saginaw, MI, USA
Registered: Feb 2002
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posted 11-15-2002 06:55 AM
John,The way that the "fluid clutch" worked was uncanny. When the reel and shaft turned at nearly the same speed, the clutch was almost locked but as the film takeup reel filled, it became active and applied the right tension for the takeup. We had little trouble with the ones I serviced (about 150). The only one I ever replaced had a cracked case and the 'fluid' leaked out. In cleaning it up we found out it was a Silicone substance. In a payout situation, the tension would be greatest when the reel is turning slowly and then decrease as the speed of the rotation increased near the center of the reel. Seems like the ideal mechanism to me. When running 6,000 foot reels on the Zeis Favorite 16B, it is necessary to adjust the tension of the payout once during each showing to minimize sprocket tension during the second half of the show. KEN
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