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Author Topic: Green Band Scratching David Whitbeck Film Handler Posts: 70 From: Tempe, AZ Registered: Jun 2001 posted 07-23-2001 12:36 PM                     I'm running a Simplex 35 with a 701 penthouse reader and an SH-75 soundhead down below. The 35 has a 3 pad studio gate with forward/reverse tension shoes. The green band is scratching on the soundtrack side and it's leaving quite a mess. I've had piles of shavings after a show. I've checked over everything again and again and I can't find where it's scratching. Any ideas?  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 07-23-2001 12:53 PM                     It could be your trap & gate.Remove & dismantle the gate & trap & check for gouges,scoring,burrs & rough spots. You may have to remove & check the sprockets& pad rollers & strippers on the sprockets. Check the intermittent shoe also,& the sond drum & all rollers & lateral guide roller assembly in sound head. Check readers & see if theyr'e scraping the film. Whether your'e running reels or platters, run a test film unscratched & eye each part of the film path & figure out what is scratching the soundtrack.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 07-23-2001 01:19 PM                        Ditto to Matthew's suggestions. Which side (emulsion or base) is being scuffed/scratched by the projector? If you don't see a scratch, it may be that you are scuffing the film edge or chipping away at the perforation area. Look first at the area in the film path where the skivings are building up. The "pile of shavings" can be identified by some simple tests: Gelatin emulsion will dissolve in laundry bleach (sodium hypochlorite) and usually has color. Under a microscope, you can see the structure of the dye-containing layers. Acetate support will dissolve in splicing cement. Polyester support is impervious to most solvents, including splicing cement. ------------------ 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 Cell: 716-781-4036 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 07-23-2001 04:23 PM                     From what you & John mentined,it's probably the SDDS track. Which part of the soundhead & projector are the shavings accumulating?  |  IP: Logged

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