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Author Topic: How to do 3D Interlock. Selsyns the best way to go? Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 04-18-2005 11:28 AM                        Carried from here: Basement/Penthouse Readers Thread It is sounding like these things (electronic controllers) are run just for speed control, but what about interlock -- are selsyns still the way to interlock for for 3D? I know interlock is used extensively for passing a print to a number of projectors, but that doesn't need to have absolute; what would be the best/easiest setup for frame-accurate reliability to lock up two projectors for 3D? Can the electronic controllers with tach talk to each other to keep two machines locked? If I go selsys, that would mean that I would only need to get the bracket to hold the selsyn and wouldn't require changing the existing motors. Don't the controllers need the motors swapped out for synchronous motors? Sounds like a much bigger job than just adding the selsyns....I think I even have the brackets.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-18-2005 04:17 PM                     I would use 2 Baldor drives ad motors and slave them together. Mark  |  IP: Logged Richard Hamilton Phenomenal Film Handler Posts: 1341 From: Evansville, Indiana Registered: Jan 2000 posted 04-18-2005 08:51 PM                     Frank, The couple of 3d's that I've done use Baldor motors and controllers. They are sync'd via a Baldor Smartmove. Baldor actually helped us writing the original program. When you "home" them, they are dead on, and stay that way. It's pretty cool, if you turn the Master motor by hand, the slave will stay right with it.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 04-18-2005 08:55 PM                  The absolute BEST 3D interlock system IS (as Mark and Richard mentioned) the Baldor drives. Have used them on 35mm, 870mm, and 1570mm projectors at up to 5hp...perfect sync and shutter phase. It's almost spooky to turn the master projector by hand and have the slave exactly follow frame to frame. YIKES!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-18-2005 10:02 PM                     Phil, The Baldors are great but what really impressed me the most was the Allen Bradley automation system that monitors all the critical aspects in the 15/70 system. That is one really impressive system and one that no one else has. I think it even reminds the operator when his bladder is getting full........ Mark  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 04-18-2005 10:14 PM                  The thing that I didn't like about the AB drives was when I was doing a 48fps 1570 rolling loop projector, and had it working perfectly, I discovered that the AB controller was wrong in it's display and the projector was only running at 42 fps! A POS! Never AGAIN AB! (Yeah, I know! I was STUPIT to trust the display without a strobe verification!) So shoot me!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-18-2005 10:27 PM                     No, I wasn't talking about drives, was talking about the automation system. The projection system automation that the show controller controled...... The drives in Lehi are all Baldor. Mark  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 04-18-2005 10:50 PM                  Oh... Ummm... nevermind....  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 04-19-2005 04:02 AM                        So how much $$$ are we talking about here? And how complicated is the installation, i.e., replacing the motors, going to 1800 gears, etc.? I was under the impression the Jeff Joseph and his tech team that did the festival at the Egyptian did it their whole setup just with selsyns -- although I could be wrong on this -- and mind you, I didn't see every film -- I missed a couple of the morning screenings -- I can vouch for the fact that none that I saw ever went out of frame or a shutter go out of sync. Hey, if I can get mine to be that reliable, I would be a real happy pup. If I could do it with just the installation of the selsyns that we already own and didn't have to spend a fortune, that would be even better.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-19-2005 07:51 AM                     Typically motor cost per machine for the motor and controller is about 600.00 for the Baldors. Since you "dial" in the speed you want it can run at what ever speed you want it to. 2 units have the capability to slave together. Its high tech stuff . Selsyns will also work fine. I just prefer to to keep things that I install up to date and currrent. You can also use the Baldors to project silent film at the correct speeds, you just need to add three blade shutters. Or you can project that "Cinestage" print of 80 days at 30 fps! Thats something that Jeff's selsyns won't do...... Mark  |  IP: Logged Paul Linfesty Phenomenal Film Handler Posts: 1383 From: Bakersfield, CA, USA Registered: Nov 1999 posted 04-20-2005 12:29 AM                     quote: Mark Gulbrandsen Or you can project that "Cinestage" print of 80 days at 30 fps! Thats something that Jeff's selsyns won't do...... I thought it was the "Todd-AO" prints of 80 DAYS that ran at 30fps. "Cinestage" prints ran at 24fps.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-20-2005 08:02 AM                     quote: Paul Linfesty I thought it was the "Todd-AO" prints of 80 DAYS that ran at 30fps. "Cinestage" prints ran at 24fps. Hummm, I thought they were 30 fps.... but at least the film would be over ALOT quicker...... Mark  |  IP: Logged Mark J. Marshall Film God Posts: 3188 From: New Castle, DE, USA Registered: Aug 2002 posted 04-20-2005 12:46 PM                    quote: Frank Angel I didn't see every film -- I missed a couple of the morning screenings -- I can vouch for the fact that none that I saw ever went out of frame or a shutter go out of sync. I saw every film, and never did the shutters go out of sync. The only film that went out of sync was Gorilla At Large, and that was because one of the negatives was missing one frame about 2/3 of the way through the second reel, so that wasn't the projector's fault. Thankfully, Bob F. was able to fix that print in time for Pete's show in New York.  |  IP: Logged Jeff Taylor Jedi Master Film Handler Posts: 601 From: Chatham, NJ/East Hampton, NY Registered: Apr 2000 posted 04-22-2005 08:50 AM                     Unfortunately I did miss the 3D screenings at the Egyptian, but Jeff Joseph was kind enough to show me his personal 3D setup at his shop in Palmdale, and we screened some of the prints from the show. He used the same techs who set up the Egyptian, and his booth used selsyns with perfect results FWIW  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-25-2005 07:23 PM                     I forgot to mention that selsyns should not be left in the locked mode and not turning for long periods of time. This may cause them to overheat and possible damage may result. Its best to lock them just before the start of a show and then unlock them right after. The nice part about the electronic drive is that you have variable film run speed and variable run-up and run-down time. There is also an adjustable current overload sense that could possibly save your gear train in the event of a bad film pile up or bind up of the mechanism... Just thought I'd mention this stuff too. Mark  |  IP: Logged

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