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Author Topic: Slipping Eumig Drive Discs
Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003


 - posted February 27, 2016 03:29 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
An almost universal problem on the Eumig 800 series, and to some extent on the 900 series, is slippage of the motor drive ball aginst the forward and reverse rubber faced drive discs. Various solutions have been offered, and tested, with mixed results. Certainly wiping with alcohol, or lightly roughening up the discs with emery cloth, can help. I have tried both of these solutions, but like many pain killers, they offer only temporary relief.
Today I tried something new, which looks promising, but of course only time will tell. I was in an auto parts store and saw a spray can of fluid that is used to remove squeeks and slippage of fan belts. The product is called CRC Belt Conditioner. I though that just possibly this might help with the Eumig disc problem. So I purchased a can for $4.99. Of course just spraying it onto the drive discs is not the way to go, in fat that would guarantee the ruination of a great projector. So, I took the can outside the house and just sprayed enough into the cupped lid of the can so I could soak the tip of a q-tip applicator. Then I wiped this across the surface of the rubber discs a couple of times and let it dry for an hour. One thing I noticed immediately is that the surface of the rubber now looks a nice deep shiny black, like new rubber looks.
Anyway, when I powered up the Eumig 820 I was impressed with how it immediately came up to full speed in both forward and reverse, running like a new machine.
My S938 has been a little slow lately in getting up to full speed, so I gave it the same treatment and got the same great result! So right now it looks that this may be a worthwhile addition to the list of possible fixes for this problem.

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Clinton Hunt
Jedi Master Film Handler

Posts: 845
From: Waharoa,North Island,New Zealand
Registered: May 2010


 - posted February 27, 2016 03:37 PM      Profile for Clinton Hunt   Author's Homepage   Email Clinton Hunt   Send New Private Message       Edit/Delete Post 
Well done Paul,there always has to be someone to try new ideas first!
Goes to show that projector motors and running gears are similar to many other types of machines.Trial and error is the way to go in many cases unless it is a failure and a disaster [Smile]

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Cheers from me in New Zealand :-)

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011


 - posted February 27, 2016 05:26 PM      Profile for Janice Glesser   Email Janice Glesser   Send New Private Message       Edit/Delete Post 
Good show Paul! This is the kind of out-of-the-box creativity that is going to keep these wonderful machines running a little longer [Smile] Thanks so much for posting and let us know how it performs as time goes on.

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Pasquale DAlessio
Film God

Posts: 3523
From: Bristol,RI, USA
Registered: May 2010


 - posted February 27, 2016 05:38 PM      Profile for Pasquale DAlessio   Email Pasquale DAlessio   Send New Private Message       Edit/Delete Post 
Paul

Well done. I have been using the same product on belts and rubber rollers for quite a while. But never thought of the disk. You have to think out side of the (projector) box!

PatD

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Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013


 - posted February 27, 2016 06:29 PM      Profile for Dominique De Bast   Email Dominique De Bast   Send New Private Message       Edit/Delete Post 
Thank you, Paul ! I hope it will be a long term solution.

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Dominique

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Joe Taffis
Phenomenal Film Handler

Posts: 1592
From: United States
Registered: Jun 2003


 - posted February 28, 2016 01:18 PM      Profile for Joe Taffis   Email Joe Taffis   Send New Private Message       Edit/Delete Post 
CRC also makes a good spray electric contact cleaner...

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Joe Taffis

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Barry Fritz
Phenomenal Film Handler

Posts: 1061
From: Burnsville, MN, USA
Registered: Dec 2009


 - posted February 28, 2016 06:08 PM      Profile for Barry Fritz   Email Barry Fritz   Send New Private Message       Edit/Delete Post 
I have used a rubber rejuvenator product that is used for rollers in printer and copy machines and also for the platens on typewriters. It is a spray also, but I spray it in a jar and brush it on.

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006


 - posted February 29, 2016 07:22 AM      Profile for Lee Mannering     Send New Private Message       Edit/Delete Post 
Excellent Paul!

It says on the tin use every 3000 miles, any idea how many feet of film that will be? [Big Grin] Sorry couldn't resist that.

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003


 - posted February 29, 2016 10:50 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
That works out to 15,840,000 ft of film Lee - or 13,200 hrs run time! [Big Grin]

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Bill Phelps
Phenomenal Film Handler

Posts: 1482
From: USA
Registered: Jan 2009


 - posted February 29, 2016 10:53 AM      Profile for Bill Phelps     Send New Private Message       Edit/Delete Post 
Looks like one application should do it!

Bill [Smile]

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Osi Osgood
Film God

Posts: 10204
From: #399R K.O.A. Mountian Home, ID. 83647
Registered: Jul 2005


 - posted February 29, 2016 12:25 PM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Is that the sound which sounds like a car starting, when you turn on you're projector? I had that problem in short form some years ago, I can't remember exactly what I did to counteract it.

I have a different problem ...

At times, when I turn on my 926 EUMIG, it will start a little slow, rev up to the 24 fps after just a bit, but it can fluctuate back and forth just a little. It seems to be getting worse at this, even if I use it daily. I thought this would have been a problem with a projector sitting idle for weeks.

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Gary Crawford
Jedi Master Film Handler

Posts: 979
From: Manassas, VA. USA
Registered: Jun 2003


 - posted March 01, 2016 06:36 AM      Profile for Gary Crawford   Email Gary Crawford   Send New Private Message       Edit/Delete Post 
Paul...I was told about belt dressing sprays for Eumigs back in the 80's when my old Standard 8 Mark S began to slow down. The dressing stuff worked for a while, but eventually the metal ball and hundreds of hours of operation wore an actual indentation in the rubber wheel. For a while I used the cycles switch to move 24fps up on the roller a bit. But again, the wheel wore down and that was that. If someone could come up with a process to re-rubberize the wheel, THEN we'd have something.

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003


 - posted March 01, 2016 09:58 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Obviously that is the ultimate solution to this problem Gary, Many years ago I did in fact repair an S 709, which belonged to a friend of mine. I had access to a really good machine shop where I worked, and was able to 'bootleg' the manufacture of some special parts for his Eumig at no cost (to me!). These included two new Delrin AF bushings for the motor mount, and two Butyl B612-70 rubber discs'. These discs were 0.062 ins thick, and I cut them across the diameter with a razor blade in one place from the outside diameter to the inside diameter. I then was able to position these on top of the original discs and bond them in place with a thin layer of Scotchweld epoxy. It worked great!

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003


 - posted March 01, 2016 10:23 AM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
I have this idea of putting rubber shrink tube over the metal ball, but until my Eumig grinds to a halt it is no more than just a theory!

I have enough broken stuff to mess around with that I never feel the need to "fix" the functioning stuff!

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All I ask is a wide screen and a projector to light her by...

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Joseph Randall
Master Film Handler

Posts: 437
From: Wyckoff, NJ, USA
Registered: Jun 2015


 - posted March 01, 2016 12:31 PM      Profile for Joseph Randall     Send New Private Message       Edit/Delete Post 
quote:
If someone could come up with a process to re-rubberize the wheel, THEN we'd have something.
Phil Johnson did just that -- but he was selling the part for about the price you would pay for a whole projector on eBay.

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John Armer
Expert Film Handler

Posts: 139
From: Lancaster, UK
Registered: Jan 2015


 - posted February 12, 2018 05:09 PM      Profile for John Armer   Email John Armer   Send New Private Message       Edit/Delete Post 
Paul, how did you get on with the CRC belt conditioner after more than a years' use? I have a couple of 900 series Eumigs and, while the speed is mostly OK at the moment, one of them occasionally takes a few seconds to speed up when started up from cold. If the conditioner has been OK I'd be interested in getting hold of some of this to keep the machines running in the future.

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