Film-Tech Forum ARCHIVE: Christie Platter Motor Drive Wheels ?

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Topic: Christie Platter Motor Drive Wheels ?

Glenn Conatser
Film Handler

Posts: 73
From: Northern California
Registered: Aug 2001

posted 08-15-2002 01:28 PM

Im writing to find out if anyone knows why these new white Christie drive rollers ive been receiving seem to disintegrate into a sticky mess. This sticky residue is a pain in the butt to get off of the platters also. I was told these drive rollers where new and improved and more resistent to the flat spots the old ones would delvelop.

Thanks,
Glenn

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99

posted 08-15-2002 02:29 PM

I've yet to see a problem with the new drive wheels. It's those old orange/yellow colored ones that would turn to mush in a few weeks time.

Are your axle bearings in good condition? If you hold the motor away from the platter and give the deck a gentle spin, does it turn effortlessly? Also do you have the correct springs to hold the motor against the platter? Often I find people have replaced those for whatever reason and they are putting far too much tension against the platter.

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 08-15-2002 02:39 PM

Drive wheels turning to a "sticky mess" could be from using some improper cleaning or lubrication solvent on or near the wheels.

But I agree with Brad that if the drive wheel is not properly tensioned against the platter, or if the platter does not turn freely, slippage could occur, generating frictional wear/heating of the wheel surface.

Is the "sticky mess" on the driving surface, or is the entire wheel getting soft?

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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Glenn Conatser
Film Handler

Posts: 73
From: Northern California
Registered: Aug 2001

posted 08-15-2002 07:08 PM

Thanks John and Brad. I will look into the things mentioned. My tech will be here tomorrow for a diffrent issue and ill trouble shoot some more with him and see what we come up with.

Glenn

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Matthew Bailey
Master Film Handler

Posts: 461
From: Port Arthur,TX
Registered: Sep 2000

posted 08-16-2002 12:18 PM

I found some of those drive wheels for my AW3 that don't turn to mush. Theyr'e designed mainly for printing presses,other printing equipment,photocopiers,or other types of office equipment. Theyr'e only the same size.

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Manuel Francisco Valencia
Expert Film Handler

Posts: 151
From: Oklahoma City, OK, USA
Registered: Dec 2000

posted 08-17-2002 12:47 PM

Those crappy yellow wheels are the only thing bad about these platters and when I got the new white ones I was so relieved. The core to the wheel is a great improvement, better than those near razor sharp cores of the yellow wheel. Glenn you might want to check your platter calibration. We did have one that went out really quick but it was on the platter that is heavly used for building up and breaking down. My projectionists like to crank the speed up when building up and breaking down. I am getting sense into thier head though.

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Matthew Bailey
Master Film Handler

Posts: 461
From: Port Arthur,TX
Registered: Sep 2000

posted 08-17-2002 08:36 PM

I forgot the rollers I mentioned are mostly used for feeding paper, but they should work. They work on my AW3 without any problem. Some have ridges on them across their width which mean they create a mechanical buzzing sound when driving the decks.

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Josh Jones
Redhat

Posts: 1207
From: Plano, TX
Registered: Apr 2000

posted 08-18-2002 12:54 AM

Our booth is noisy enough without buzzing platters

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"Film is made of silver, video is made of rust"
'nuf said

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Adam Martin
I'm not even gonna point out the irony.

Posts: 3686
From: Dallas, TX
Registered: Nov 2000

posted 08-18-2002 11:42 AM

W H A T ? ! ?

I ' M . R U N N I N G . 3 - D . R I G H T . N O W !

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 08-18-2002 12:08 PM

Adam did you forget to close the hoods

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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002

posted 08-18-2002 03:07 PM

When you say that they are "white" are they really white?

I've got some that are cream-colored or tan. They're not soft at all. In fact, when I saw them I wondered if they were the right part. (There was also a bad batch about 2 or 3 years ago that were recalled.)

What's the earliest possible date code on these white tires? I've got a batch of spares from 01/01.

~Manny.

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Mathew Molloy
Master Film Handler

Posts: 357
From: The Santa Cruz Mountains
Registered: Nov 2000

posted 10-19-2002 12:06 AM

Glenn, did you find out what the reason was for those drive wheels turning to goo? I've got three of those cream-colored wheels I just received about 4 months ago that are all going gooey on me.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 10-19-2002 01:37 AM

The good news is that you don't have to buy the Christie drive wheels if you don't want to. Edw. Wolk now manufactures and sells that Christie part. Cost from them is about 10 dollars less than from Christie. We have had some of them in the field for quite a while(I think approaching 1 year, possibly longer) with no trouble at all. We also just rebuilt 8 AW-3's all with these Wolk drive wheels. The quality of them is VERY high!!
Mark @ CLACO

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99

posted 10-19-2002 01:39 AM

Christie over the last few weeks sent out another recall on a batch. I want to say it was wheels date stamped 10 01 and 11 01. That may not be the right dates though.

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Jon Bartow
Master Film Handler

Posts: 287
From: Massachusetts
Registered: Nov 1999

posted 10-21-2002 10:48 PM

Brad, I had a bunch of 10/01 drive wheels that died (turned to goo) about a month ago.

The best method that I've found for cleaning the platters:
Use some liquid gum remover (not the aerosol freeze stuff, an actual liquid) and a scotch pad. It takes a little elbow grease, but if you let it soak for a minute or so it's not that bad. Then alcohol to clean the gum remover off. (all of this without film on the platter of course)

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