Film-Tech Forum ARCHIVE: Proper threading of Mag penthouses

This is topic Proper threading of Mag penthouses in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Nathan Guerriero (Member # 1214) on 06-14-2002, 03:32 PM:

What is the proper way to thread 35 through the Century mag penthouse on a JJ. I was watching Windtalkers last night and noticed a thin baseline scratch coming and going. I kept checking the film path and everything seemed fine, but I could be mistaken. I think that it is coming from the mag penthouse, or they are just leftover scratches from the screening at the Lake Street Screening Room. (kidding)

So what's the proper way to thread that thing?

Thanx!

Posted by Brad Miller (Member # 2) on 06-14-2002, 03:39 PM:

I'll take a picture and post it later today. However, you should not be threading past the mag head if you are not running a mag print. Also, the sprocket drive in the JJ's penthouse needs to be flipped so the 70mm pad roller is against the sprocket.

Posted by Nathan Guerriero (Member # 1214) on 06-14-2002, 03:45 PM:

Right, I should clarify. I'm not threading through the head, I'm threading around it. Or rather, I'm not sure how to thread around it. I don't use the JJs on a daily basis, so I'm a little unfamiliar with them.

Posted by Nathan Guerriero (Member # 1214) on 06-23-2002, 04:25 PM:

Well, I'm sorry to see that this topic hasn't sparked great interest in the community, and I don't mean to be a pain in the butt, but if someone could help me with this, I would appreciate it. I've got to open this theatre on Friday for full-time operation, and I'd just assume not destroy our prints on the first night.

Thanx!

Posted by Gordon McLeod (Member # 33) on 06-23-2002, 04:32 PM:

I believe that the threading diagram is in the projector manual in the manual section
Turn the pad assembly on the penthouse sprocket so the 70mm side engages the sprocket and the 35mm film will run down the backside of the 35mm roller

Posted by Josh Jones (Member # 447) on 06-23-2002, 04:41 PM:

So what happened to the picture idea?

Josh

Posted by Gordon McLeod (Member # 33) on 06-23-2002, 05:18 PM:

Well it looks like the pages with the threading diagram 73 and 74 are not in the online pdf file for the machine but the instructions in text form are

Posted by Manny Knowles (Member # 1171) on 06-24-2002, 08:16 AM:

I've never seen a JJ so I'm interested in seeing a pic.

Posted by Gordon McLeod (Member # 33) on 06-24-2002, 09:40 AM:

JJ's look at the pictures of the Uptown,, the Music Hal;l and of course the Filmtech screening room

Posted by Christopher Seo (Member # 7) on 06-24-2002, 12:13 PM:

The film should be contacting only two rollers in the mag penthouse: the first metal roller encountered going into the penthouse, and the nylon 35mm pad roller for the penthouse drive sprocket. Again, turn the 35/70 pad roller so that the 70mm roller is against the sprocket and the 35mm roller is in back, and run the film around it (to the left). From that, the film should go straight into the projector head and the upper feed sprocket.

Posted by John Pytlak (Member # 331) on 06-24-2002, 12:24 PM:

Here's the manual (high quality scan, large 6 megabyte .pdf file). See pages 10 to 16 for threading diagrams:
CLICK HERE

------------------
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

Posted by Nathan Guerriero (Member # 1214) on 06-24-2002, 05:31 PM:

Thanx for the info, everyone. I read the manual and I feel a much more comforable working with the JJs now, and I'm not so worried about scratches. Thanks again!

Posted by Gerard S. Cohen (Member # 994) on 06-24-2002, 06:16 PM:

Wow! John, you're right it is a "high wuality large format scan",
fastest and most beautiful Acrobat Reader .pdf file I've ever viewed!
Was that bit of color atop the right corner of my screen a Kodak logo?
Good to see "my old" JJ looking like a Peter Gowland magazine cover.

Posted by John Pytlak (Member # 331) on 06-25-2002, 07:22 AM:

The .pdf file for that manual was on the R. S. Engineering and Manufacturing website. I assume they did the scan from an original Century manual. They have over 700 manuals on-line.
http://www.rsem.com/
http://www.rsem.com/equipment-manuals.asp

Posted by Brad Miller (Member # 2) on 06-25-2002, 02:27 PM:

That was a Strong produced pdf file and I haven't had the time to add it to our collection here. Many of their others are actually Film-Tech scanned pdf files too, with my front page stripped from it. Grrrrr.

Posted by John Pytlak (Member # 331) on 06-25-2002, 02:36 PM:

Piracy!!! Call the MPAA.

Posted by Brad Miller (Member # 2) on 06-25-2002, 03:39 PM:

Jack Valenti told me to take a hike, that they only went after MOVIE pirates. Damn.

Anyway, it's not that big of a deal to me. The whole point is to make the information available to the people who need it. It just "kinda sucks" that they stripped my stamp from the front page when I was the one who sat down and spent many days upon days scanning much of that stuff into electronic files.

Posted by Leo Enticknap (Member # 534) on 06-26-2002, 02:46 AM:

Brad: it's possible to stop people from stripping pages out of a PDF file.

Assuming you're using Acrobat 4, when you save a file, click on 'security options' in the save dialogue box. Select 'standard' from the menu, and you will then have four boxes to tick: stop people printing, stop people modifying the file, stop people selecting text and graphics and stop people changing annotations and form fields. Select any or all of these as you like, then set a password to change the security options. Save the file and it's protected.

You can also do 'file' - 'sign and save' to give the file a digital signature for added protection and identification if one of your PDFs appears on another website.

Anyone who then downloads the file and opens it using the full version of Acrobat will find the relevant buttons and menu options (e.g. in your case 'documents' - 'delete pages') greyed out. If someone tries to do 'save as' with a new filename in order to get rid of the restrictions, they'll need to enter the password in order to change the security settings (i.e. allow something in the new file that you've banned in the existing one).

I imagine the procedure is pretty similar with Acrobat 5, but I've never used it and so couldn't say.

I don't know how hacker-resistant this protection is, but I guess it's better than nothing...

Posted by Gordon McLeod (Member # 33) on 06-26-2002, 09:31 AM:

ACtually couldn't we get a digital watermark on each page or even a capcode