Film-Tech Forum ARCHIVE: Strong platter help, problem with take up.

This is topic Strong platter help, problem with take up. in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Matthew Stevens (Member # 2167) on 05-04-2004, 01:08 PM:

We were running a print from the top to the middle platter, and apparently the wrap is very loose on the up take. We have strong platter with potts brains (or something like that). We think it could be something with the brains but not for sure. Anyone have something similar?

I also have a question about a douser (I can't spell, sorry) plate that keeps sticking on the opening, I cleaned it and it works for a while, I also sanded it down a little. Anything else I could do?

Thank you for taking time to help.

Posted by Chris Hipp (Member # 1788) on 05-04-2004, 01:26 PM:

the changeover model would help.

Posted by Scott Norwood (Member # 30) on 05-04-2004, 01:37 PM:

Are you talking about the hand douser in the lamphouse or the electric changeover shutter in the projector? If the latter, which model projector and changeover?

Posted by Paul G. Thompson (Member # 655) on 05-04-2004, 06:47 PM:

I seriously doubt the platter problem is with the pay-out head. It sounds like a timing issue to me, possible a motor tracking pressure adjustment. Remember, those platters are variac based. The take-up sets the reference for the payout speed. The take-up will always be slower than the feed-out because of a ballast resistor in series with the motor on the take-up mode. That allows a little better headroom so the pay-out can run a little faster when the phase control or micro switch closes.

As far as the douser is concened - if it is a "Zipper" such as the Century used, the cable gets a little sluggish. The ball and spring may also be set too tight. Or, someone used too much WD-40 to free it up once before. The more you use WD-40, the more frequently you have to use it.

A good cleaning job of the cable, tube, ball, and spring shopuld fix the problem unless the tube is kinked. Check for build-up of crud in the douser slides if you have a Century, Cineshittie, Brenkert, Etc.

Posted by Dominique Replogle (Member # 2387) on 05-04-2004, 07:02 PM:

For your douser problem, try cleaning the slides realy well and aplying new grease.

Posted by Steve Kraus (Member # 476) on 05-04-2004, 08:40 PM:

Grease? Don't they run better dry?

Posted by Dominique Replogle (Member # 2387) on 05-04-2004, 08:48 PM:

I might be showing my ignororance. We grease ours. We have a CDC 15/70 with dousers powered by the air compressors.

Posted by Mark Gulbrandsen (Member # 72) on 05-04-2004, 08:53 PM:

"The more you use WD-40, the more frequently you have to use it."

I just gotta get T-Shirts made with that slogan [thumbsup]

_________________________________________________________________

Steve,
If you'd take 4 days off and come to Utah I can show you the CDC dowsers and why they need to be greased [thumbsup]

. And a few other interesting things not film related.

Mark

Posted by Dominique Replogle (Member # 2387) on 05-04-2004, 09:08 PM:

Mark,

I will take one of those T-shirts in extra large.

Dom

Posted by Steve Kraus (Member # 476) on 05-04-2004, 09:09 PM:

The original poster was talking about a conventional 35mm twin, not 15/70. People who have compressed air C/O's now have their own forum.

Posted by John Walsh (Member # 168) on 05-04-2004, 10:05 PM:

Matthew, are you saying the platters used to wind tight, but suddenly started winding loose?

We have Strong AP platters. From what I can see, they all just wind film loose. People have hung weights on the carriage to make it wind tighter, since prints were too loose to 'trust' sliding off to place on another deck.

Posted by Dustin Mitchell (Member # 372) on 05-05-2004, 08:56 PM:

Is the problem just with the one deck or all decks?
Did the print become damaged in any way-moore specificaly sprocket damage? Or perhaps there is a static problem? If you're not sure about it being a print problem you can always swap prints and see if the problem persists.