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Author Topic: Are all brain wraps preventable? John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 01-11-2004 07:50 PM                        Our Kinotone tension sensors stop the projector before there's sprocket damage. Perhaps if would help if you used a spring with less tension.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 01-11-2004 07:53 PM                     Guys, tension sensing failsafes are wonderful and all...but the real point here is to prevent brainwraps in the first place. Any time the tension failsafe trips, a brainwrap still happened and as a result your show went down. That's just not acceptable in my book, and most paying customers don't appreciate the show interruption either.  |  IP: Logged Peter Mork Expert Film Handler Posts: 181 From: Newton, MA, USA Registered: Jun 2002 posted 01-12-2004 02:58 AM                     John, the thing is when the film jams (as opposed to wraps) the tension sensor may trip, but can't stop the projector quickly enough to prevent some damage.  |  IP: Logged Bill Carter Expert Film Handler Posts: 162 From: Minneapolis, Minnesota Registered: Sep 1999 posted 01-12-2004 10:43 AM                     I would have to agree with most everybody else here. Aside from a once in a blue moon card failure, the only platter wraps I've encountered have been due to static or sticky goo on the film... both preventable.  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 01-12-2004 12:09 PM                     I don't understand how static and sticky spots can cause a wrap. That causes the film to get jammed into the center-feed, not wrap around it. Wraps in my opinion can only be caused by poor threading or a mechanical malfunction.  |  IP: Logged David Favel Jedi Master Film Handler Posts: 764 From: Ashburton, New Zealand Registered: Feb 2002 posted 01-12-2004 02:01 PM                     On a Speco if you have a sticky piece that pulls it plus some more film thru the dancer. What then happens is the projector jams but the platter keeps paying out - wrap.  |  IP: Logged Tom Wienholt Master Film Handler Posts: 371 From: Towson, MD, USA Registered: Dec 2002 posted 01-12-2004 04:24 PM                     That makes sense but the wrap wasn't the cause of the problem.  |  IP: Logged Timothy Eiler Expert Film Handler Posts: 126 From: Litchfield , Minnesota, USA Registered: Mar 2000 posted 01-12-2004 04:53 PM                        quote: I don't understand how static and sticky spots can cause a wrap. That causes the film to get jammed into the center-feed, not wrap around it. Wraps in my opinion can only be caused by poor threading or a mechanical malfunction. On the Speco Platter the are two Bumpers When there is a sticky spot on the film and it pulls more than one layer of film through the payout it usually pull the payout arm over one of the bumpers causing the payout to be either off or full speed. The Result is a wrap.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 01-12-2004 05:11 PM                     You can unscrew one of those bumpers and go to your hardware store and find a matching bolt, but about a half inch longer than the stock one. Then find yourself some washers roughly the same diameter as the bumpers. Replace the bumper with the longer screws and several washers sitting on top. That'll prevent your payout arms from "jumping" over the bumpers so at least when disaster strikes the aftermath won't be quite as bad. Of course that won't prevent the problem in the first place of sticky film and static, but we've already been over that.  |  IP: Logged

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