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Topic: Cinemeccancia

Scott Norwood
Film God

Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99

posted 06-05-2000 10:15 PM

I've never worked with Norelcos, but it's too bad that they can't take larger reels. My personal preference is for floating hub reels with 7" hubs and 26" flanges. These hold about 3 1/2 shipping reels' worth of film (4 if the shipping reels aren't full) and are easier on the film than the reels with smaller hubs. I've never seen 8" hub reels...

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John Pytlak
Film God

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

posted 06-06-2000 05:56 AM

Steve:

What am I, the "Standards Librarian" or something? Just because I was Chairman of the SMPTE Projection Committee for 8 years doesn't mean I know every detail of every standard!

But, you are correct. Standard SMPTE 192 "Shipping Reels for Prints" specifies in A.1: "The use of shipping reels with small hubs (those resulting in a flange-to-hub ratio of 3:1 or greater) on projectors and rewind equipment already adjusted for reels with large hubs (flange-to-hub ratio of 3:1 or less) can subject film tension to drastic increases which may result in perforation damage by the sprocket."

SMPTE 241 "35- and 70-mm Projection Reels" likewise specifies a hub diameter as large as possible, "which maintains the initial film tension to final film tension within the 3:1 ratio."

In addition to the film tension concerns, small hubs on reels or cores produces "core-set" ("clockspringing") in the film, which can affect focus stability.

Even you will agree that large reels need careful control of torque to maintain proper tension throughout the reel. As you know, SMPTE Recommended Practice RP 106 recommends that film tension not exceed 4.4 Newtons (16 ozf).

------------------
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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John Walsh
Film God

Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999

posted 06-06-2000 08:03 AM

Yes, but again, I am thinking about being able to put a 6000 ft reel (of 35mm) in the AA-II magazine. We really wanted to have only one c/o per show. The reel hub size would be a slightly different issue.

You know those cast 3000ft reels from Goldberg? They are (were?) avaiable with "ears" on them to space the reel out to run on a 70mm spindle. We found out that if you get them with the smallest size hub, and use them on a V8, the lower spindle turns at about the rate as the film comes out, ie: the spindle does not turn fast enough. Which means when you start the projector, the film wrapped very loosely until enough of it was on there to make the diameter larger.

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Gordon McLeod
Film God

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

posted 06-06-2000 08:17 AM

I use Goldberg sheetmetal 22" reels with 5" cores and with estar film they hold approximately3 reels

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John Walsh
Film God

Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999

posted 06-06-2000 10:55 AM

Yeah, I'm a little behind the times. I did know that the polyester Estar is thinner than the acetate; you can get more on a reel.

But, I haven't run anything but polyester on platters for 5 years now, so I'm not used to how much will fit on a reel.

Jeez, 5 years with a single c/o. Feels weird to think about that after shoveling reels for 15 years... I feel like I'm more in charge of a MacDonalds than a projection room. Training minimum wage kids, trying to 'dummy-proof' everything, etc.

Sorry, have to go now. The french-fry machine, er, rather, the projector failsafe is beeping..!

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