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Author
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Topic: electric rewinders
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Josh Jones
Redhat
Posts: 1207
From: Plano, TX
Registered: Apr 2000
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posted 09-23-2001 10:10 PM
First off, I am planning to have this for home use.What is the consensous on electric rewinders? Are they prone to scratching film, for that matter, even necessary items for a changeover booth? I have worked with one that when it started up would make the noise a reel of film makes when you hold the reel stationary and pull on the tail of film. can this cause cinch marks, or scratching of some kind? I am designing a film rewind/repair bench for my booth and am curious if one of these would come in handy. Josh
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 09-23-2001 10:18 PM
If you hear the film rubbing on itself, it IS cinching and will quickly develop permanent "cinch marks".  Powered rewinds are fine, as long as they maintain constant winding tension, and accelerate gently without cinching the film. A rewind that jumps to full speed, and then slaps the end of the film when done rewinding, is asking for film damage. Tension should be just high enough to wind a tight roll without any looseness. Excessive tension will cause uneven winding ("spoking"), will stretch the splices, and may even stretch the film.------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 09-24-2001 10:31 PM
I have used Goldberg and other electric rewinds in my days, and never had any film damage that I detected if good straight reels were used. The tin shipping reels that were all beat up will cause lots of damage to the film. And of course, so will bent and beat up house reels.Yes, you have to watch the tension very carefully. Some electric rewinds I used were so loose that the film actually "sagged" on the rewound reel. When we were taught hand re-wind and inspection techniques in MPO school, tension adjustments were frequently needed. Especially when you have to start and stop to inspect a splices, and any other defect that is on the film. Cplse attention was paid to an even film pile on the reel, and even tension so that the film would not cinch the reel convolutions. Josh, I will be happy to demonstrate these techniques to you next month. Your hand rewinds you have at present will do the job. One secret is never get in a hurry. Paul
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I am saving this for a rainy, maybe blizzard day. I would also like to incorperate a light table into the bench for film inspection.
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