This is topic Metal shavings in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Mike Jones (Member # 522) on 07-19-2001, 02:28 PM:
I've got a Century SA-TA projector and was just wondering what could cause it to have metal shavings?Thoughts?
Posted by John Pytlak (Member # 331) on 07-19-2001, 03:07 PM:
Need more specific information. Where exactly are the shavings being seen? Describe the shavings -- color, size, are they attracted to a magnet? Any other symptoms -- scraping sound, binding of gear train, problems with projected image? How long has the problem been occuring?------------------
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
Posted by Gordon McLeod (Member # 33) on 07-19-2001, 09:58 PM:
A fast bet is a misaligned intermitent shoe
Posted by Mike Jones (Member # 522) on 07-20-2001, 04:11 AM:
The shavings are happening right at the film gate and are very small, almost dark blue. Not sure if they are magnetized, as I am now at home.
Posted by Michael Hunt (Member # 772) on 07-20-2001, 09:54 AM:
Hmm,It could be that what you have here is the remains of gunk that has built up in the gate, and been 'baked on' and then chipped off as splices go through...
I've had similar dark blue deposits in the gate area of my Westrex when running films that have been heavily chinagraphed.
I've usually found that such a build up of gunk in the gate will cause focus problems as reel ends approach.
I'd be checking the gate for build up if I were you
------------------
Uncle to JEDI Hunt,
honest!
Posted by Mike Jones (Member # 522) on 07-20-2001, 01:33 PM:
No, I have been checking the gate the build-up like you mentioned and I know that isn't it. It happens consistently throughout the show. It must be something too tight in the gate, but what that is I can not figure out.
Posted by Dave Macaulay (Member # 813) on 07-23-2001, 09:07 AM:
There isn't much anything in the gate that can give off filings. No moving parts except the film, and it isn't going to grind off metal.
If something very nasty is happening in the shutter area some crap might get through the aperture, but not likely.
Check around the moving parts. The sprocket traps are probably maladjusted or bent. The intermittent trap is the most likely culprit.
I may even be a loose intermittent sprocket - is that one pinned or clamped? - or a failing intermittent shaft bearing.
Make sure it really is metal, the parts that can usually be ground up are all steel so a magnet will help. Something real bad has to happen for the alloy case to be worn at! Stuff powdered off the film can look very metallic, especially any photogard-like coating that is inadvertently put on/in the sprocket holes.