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This topic comprises 2 pages: 1 2
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Author
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Topic: How Heavy a Load for an RCA1040
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Christopher Seo
Jedi Master Film Handler
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Posts: 530
From: Los Angeles, CA
Registered: Jun 99
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posted 04-26-2004 08:49 AM
I've taken to stuffing paper towels into the drive side of my 1040s, between the gear compartment and main casting, and this has drastically reduced the need to clean oil off the take-up belt, floor, etc.
I also run 6000' reels on Kelmar arms with these soundheads, and am wondering if anyone has quantifiable real-world recommendations for take-up tension. I.e., how many newtons of tension (as measured at the hub with a spring gauge) will produce a satisfactorily tight wind with 6000' of film? I suppose a 'satisfactory' wind could be defined as a wind in which the outer convolutions of film are wound tightly enough that they will not cinch when rewound with enough tension to ensure that they will also not cinch while being pulled off the hub of the feed reel.
For a basic take-up clutch assembly, the SMPTE RP-106 spec of 4.4 N maximum is clearly far too little. If the hub were set with that tension, the outside of a 6000' roll would be mushy soft, probably to the point of sagging below the reel edge.
I have found that hub tension somewhere around 15 N produces a tight wind at the edge, and is far below the SMPTE 'rupture limit' of 66.7 N, but at the cost of high tension on the first 500-1000' of film and possible premature wear on the holdback sprocket.
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