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Author Topic: Upload your random pictures Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-05-2003 09:36 PM                     Looks like a older Filmtech screening room picture  |  IP: Logged Jonathan Worthing Master Film Handler Posts: 384 From: Hereford, UK Registered: Apr 2001 posted 02-17-2003 04:57 AM                     Find the dog. Hard to see, but he is in there  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-20-2003 09:27 AM                    What happens to your JJ when you sell it to a theatre Another local venue last year did the same thing to the 70mm teeth on one of theirs. Be afraid; be very afraid  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-20-2003 09:54 AM                        How did it happen?  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-20-2003 12:04 PM                    In the pictured instance, the children running the booth didn't notice the intermittent shoe runner had come loose and was running on top of the sprocket teeth. The sprocket is of necessity a very lightweight alloy to keep the mass low. Once the hard coating is worn off it wears down quickly. This sprocket was still pulling film successfully when the problem was noticed and it was replaced. In the 70mm incident (elsewhere) the operator changing gauges neglected to insert the shoe component fully into the machine. He/she also didn't realize the importance of keeping the particular components (gate, trap, shoes) with their own machine which may or may not have been a factor but certainly prevented proper image alignment and focus. The sprocket failed during a show and a print was damaged. Edit: Added a word for clarity. [ 02-20-2003, 06:24 PM: Message edited by: Steve Kraus ]  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-20-2003 12:12 PM                        I suspected as much. ESTAR base film is tough, but not THAT tough. Did the shoes get damaged as well? Would suspect there was quite a bit of metal debris and noise if the "children" kept their eyes and ears open enough to notice.  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 02-20-2003 12:37 PM                     quote: The sprocket is of necessity a very lightweight alloy to keep the mass low I always thought that 35/70mm sprockets were made of alloy [read: non-ferric] materials because they cannot become magnetized and damage the 70mm mag tracks... -Aaron  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-20-2003 12:42 PM                        These sprockets needed to be BOTH low mass and non-magnetic, yet durable enough to run many millions of feet of film. And with competent projectionists, they did.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-20-2003 01:05 PM                    I can't discount the non-ferrous idea entirely but note that the other sprockets on the machine are conventional hardened steel (AFAIK) as are intermittent and other sprockets on 35mm machines set up for 4-track magnetic so I tend to conclude the material is chosen primarily to reduce the mass that needs to be accelerated and deccelerated very quickly.  |  IP: Logged Bill Gabel Film God Posts: 3873 From: Technicolor / Postworks NY, USA Registered: Jan 2002 posted 02-20-2003 01:18 PM                     Once I was sent to a Mann theatre in Monrovia, Ca. I was working vacation for the regular operator. It was a six plex, two houses had DP-70's. The kids ran the booth and I had to fix stuff around the theatre. On the DP70's I found that the 35/70 spocket looked just like the picture above from Steve. I found that the kids, when they would clean the gate. They would knock loose the bands and the bands would slice into the teeth of the 35mm part of the spocket. I ordered two new spockets from Mann Theatres. But later I showed the kids how to clean that type of projector. I came back a few months later and found one of the spockets was starting to look like the picture again .  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-20-2003 08:20 PM                        The intermittent motion of the intermittent sprocket may slightly magnetize a hardened steel sprocket (due to the starting and stopping in the same direction). The constant speed sprockets wouldn't magnetize themselves since they don't start and stop 'at all'.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-20-2003 08:27 PM                    Hmm...I'll have to cogitate on that one a bit. Right now the physics of what you're saying escape me.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-22-2003 03:11 AM                    LOA ECN  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 02-22-2003 04:04 PM                        Hmmmm... a faded negative of some ancient film shot on 65mm. I like how the frame was cut out with a pair of scissors.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 02-22-2003 04:52 PM                        So when can we expect to see this advertised as a "rare film cell" on Ebay?  |  IP: Logged

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