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» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » ELR Why not? (Page 3)

 
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Author Topic: ELR Why not?
Brad Miller
Administrator

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


 - posted 09-22-2000 03:42 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
The Christie MUTs only strain when the film is being pulled off too slowly. Keep the speed at least 1:00 position on the control and you should be fine.

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Dave Cutler
Master Film Handler

Posts: 277
From: Centennial, CO
Registered: Jun 2000


 - posted 09-22-2000 03:42 PM      Profile for Dave Cutler   Email Dave Cutler   Send New Private Message       Edit/Delete Post 
Paul, if you are having trouble with your Christie MUT not being able to pull the platter with an almost full 6000' reel, try this. Insert a pencil (or something) between the motor mount and the platter support arm, effectively disengaging the motor from the platter. This way there is no back tension on the platter so the MUT doesn't have to work as hard. Just be careful not to go to fast, the platter won't slow down. You have to use your hand and this can be very dangerous if the platter isn't smooth.

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Brad Miller
Administrator

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


 - posted 09-22-2000 04:16 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
NO NO NO NO NO! Do NOT disengate that motor. Breaking down in that manner does not provide constant backtension. That causes cinch mark scratches on the film during breakdown as well as a very poor wind which can cause perforation damage during transit. Never do that.


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Dave Cutler
Master Film Handler

Posts: 277
From: Centennial, CO
Registered: Jun 2000


 - posted 09-22-2000 06:17 PM      Profile for Dave Cutler   Email Dave Cutler   Send New Private Message       Edit/Delete Post 
<-- Brad after reading my comment

I have to disagree with you again Brad, and I will defend myself. I think that the motor on the Christie platter adds way too much backtension on a print during breakdown. You risk stretching the film when the motor in engaged.

You end up with a terribly sloppy reel when the motor is engaged, and the print will be damaged during shipping because it isn't smooth (flat).

You don't let the platter spin completly free. I add a little (and I stress little) backtension by holding on to the platter with my hand. Yes you have to be careful, you have to be careful with a lot of things in a booth. Yes, I end up with a perfectly smooth (flat) reel. No, it is not loose, and it will not shift during shipping. No, there are not cinch marks on the print. You will not damage the print if it is done properly.

Obviously you don't agree (strongly), but I know that I have not damaged a print in this manner. I get much better results doing this, than when I tried to leave the motor engaged.


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Brad Miller
Administrator

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


 - posted 09-22-2000 06:28 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Dave,

Yes, I horribly disagree with you on this. How many times have you broken down a print in this manner and then rebuilt it up a couple of times? You haven't, have you? 99.9% of the time the booth that breaks down a print never sees it on screen again and has no idea what damage they are doing. I understood you are trying to brake with your hand, but no human is going to exert constantly even tension. Also, I don't know what kind of film stocks you run in your booth, but I've never had a problem with even acetate film breaking on an AW3 during breakdown. If acetate stocks break down perfectly, there is no way that polyester stocks are going to "stretch". I'm sure John Pytlak can back me up on that one, at least in reference to the durability and strength of Kodak stocks.

Your problem is clearly that your rollers are not aligned properly, which will ALWAYS result in a dished or otherwise warped wind. Correct those problems, don't alter the design of the platter. If the rollers are aligned properly, you will get a perfectly flat, smooth and tightly wound roll. The only other problem you may be having is perhaps your operators are forgetting to punch the "makeup" button on the AW3 before they break down. Many people seem confused by that as you don't HAVE to punch that button in to actually break a print down, but if you don't, the backtension WILL be too much.


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Paul Cunningham
Expert Film Handler

Posts: 146
From: Melbourne, Australia
Registered: Jun 2000


 - posted 09-23-2000 07:50 AM      Profile for Paul Cunningham   Email Paul Cunningham   Send New Private Message       Edit/Delete Post 
I think that ELR's make it easier to train the monkeys.

According to the monkey training manual the easier it is to train one the less intelligent they need to be.

With less intelligent monkeys the opportunities for other forms of monkey business (read - severe print damage) increase considerably.

Also less intelligent monkeys require fewer bananas at feeding (read - pay) time.

Cheers Paul

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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!

Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999


 - posted 09-23-2000 05:51 PM      Profile for Aaron Sisemore   Email Aaron Sisemore   Send New Private Message       Edit/Delete Post 
On most AW3's I do disengage the motor for braking down a print as the back tension is really high especially at the last three reels or so. If breaking a film from an AW3 with the motor disengaged is 'guaranteed' to cause such problems, then why is disengaging the motors the proper way to do it with Strong, Potts, CFS, Neumade/Xetron, Norelco/Kinoton, and others? If you have a rough edge you use a rag to apply the back-tension to the platter disc and you can vary the tension as opposed to the Christie where its fixed unproportionally to the diameter of the film wind on the disc...

Aaron

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Brad Miller
Administrator

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


 - posted 09-24-2000 01:32 AM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
That's precisely the #1 reason why I do not install those platters you just listed. It is a thoughtless design flaw in respect to film care. I did not realize the Kinoton/Norelco platters were that way as well, as I've never installed or worked with one. I guess that shoots those down too. I prefer Christies and SPECOs. Anyway, I've been in many positions where I've had to build up and break down the same print a couple of dozen times and on an AW3 with the motor engaged and the makeup button depressed, there is no damage. There IS damage when the decks spin freely with only human intervention to provide backtension. Again, this does not start to show up for a couple of breakdowns in the typical theater...but it is noticeable damage in a screening room type of application where light is a plenty and any damage to the film is a horrible distraction. Most people don't really seem to give much of a shit about what happens to that print after they are finished running it, or they simply do not realize the damage they are doing by various breakdown procedures. Very few of them have ever actually even re-built up a print they have broken down. Most people just look out the window on that last show and see a nice print and believe that the print left "perfect", when in reality, damage could very well have happened during breakdown, and frequently does!

Are you engaging the "makeup" button before you try to break down when you are getting such tension? Remember, this button MUST be depressed for breakdown as well as makeup. If you are still getting too much tension, I'd be interested in knowing the vintage of the platters.

Hey Bevan, when are you going to start participating? I know you're reading this. Now would be an excellent time to chime in.

By the way, I've found some Christie takeup rings will collapse slightly during breakdown (yet some others do not...must've been a change in material). If this is happening to you, one of those plastic DTS cases the feature discs come in fits perfectly in the opening to essentially "lock" the center ring during breakdown.


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Dave Cutler
Master Film Handler

Posts: 277
From: Centennial, CO
Registered: Jun 2000


 - posted 09-24-2000 11:09 AM      Profile for Dave Cutler   Email Dave Cutler   Send New Private Message       Edit/Delete Post 
But, like I said in a different topic, the Strong MUT has the tension roller/spring assembly on it. It doesn't take much speed to make sure it is always slightly 'engaged.' You will end up with a perfect reel every time and it won't be damaged. This is one of the reasons I think the Strong platter is best, but I know Brad doesn't like the small rollers.

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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!

Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999


 - posted 09-24-2000 11:44 AM      Profile for Aaron Sisemore   Email Aaron Sisemore   Send New Private Message       Edit/Delete Post 
Yes Brad... The make-up button was in for the platter being broken down from. Still awfully tight... These vary in vintage from 1979 '50th Anniversary' models to 1980s vintage AW3Rs... Not all of them exhibit this anomaly, but most of the ones I have worked with have.

Never worked with a Speco, so i can't say anything about them.

Aaron

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Brad Miller
Administrator

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


 - posted 09-24-2000 01:43 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Dave,

I'll give you that spring roller does help immensely in respect to "hand braking", but I still have been less than pleased with the results.

Aaron,

I've not ran into that problem you are describing. Once however I did find that someone had replaced the stock motor spring with something that was too large and too strong. It was tearing up the motor drive wheel and causing incredible amounts of drag on the platter during breakdown, but it was not a design flaw. Just for kicks, you might want to investigate that. Also, if the motor drive belt is worn down a lot, the motor will have to spin significantly faster and that could be causing the excess drag on those certain models.

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Scott D. Neff
Theatre Dork

Posts: 919
From: San Francisco, CA
Registered: Oct 1999


 - posted 09-24-2000 01:59 PM      Profile for Scott D. Neff   Author's Homepage   Email Scott D. Neff   Send New Private Message       Edit/Delete Post 
Aaron breaks down from an AW3 like once in a blue moon.

Although I will agree with him... around reel 3 it gets difficult... but I think that's more related to the age and condition of the motor on the spindle of the MUT.

But that's just me. I'm going to go mind my desk now.

Scott Neff
Confections Auditor Pro-Tem
Century Theatres

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John Pytlak
Film God

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


 - posted 09-26-2000 12:48 PM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
SMPTE Recommended Practice RP 106 specifies maximum 35-mm film tension to be less than 16 ozf., primarily to prevent sprocket teeth from damaging perfs. In systems without sprockets (breaking down from a platter to a MUT), back tension of one or two pounds should not harm or stretch polyester film. The only real risk I see with too much tension in this situation is stretching tape splices, or winding a roll so tight that it "spokes". The wound roll should never be "loose", such that the film convolutions shift or the roll dishes easily --- a loose roll is much more prone to cinch. Manually holding back tension is hard to do consistently.

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com

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Stefan Scholz
Expert Film Handler

Posts: 223
From: Schoenberg, Germany
Registered: Sep 1999


 - posted 09-30-2000 03:20 AM      Profile for Stefan Scholz   Author's Homepage   Email Stefan Scholz   Send New Private Message       Edit/Delete Post 
I remember someone saying at a convention, "ELR is like sex in High School, everybody talks about it, but noone has ever tried it". --
There is some truth in this. Tension related problems could be overcome with electronic controls in winding devices, that's certainly not the point. The point is investments to change existing structures, special in film warehouses and transport Co.'s. There infrastructure is based on 2000 ft (16") reels.

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John Wilson
Film God

Posts: 5438
From: Sydney, Australia.
Registered: Dec 1999


 - posted 09-30-2000 04:21 AM      Profile for John Wilson   Email John Wilson   Send New Private Message       Edit/Delete Post 
Kinoton's don't disengage the motor..at least, not the newer models, I'm not sure about the older ones.

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