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Author Topic: Using a Century JJ atop a R3 Sound head Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-03-2011 03:58 PM                     I've mounted a JJ on top of my spare R3 sound head but the JJ is turning too slow. I assume there is a different projector pulley on the JJ as opposed to the Century SA. Can anyone tell me which pulley to use? Or maybe the motor shaft has a different pulley?? Thanks... Don  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-03-2011 04:09 PM                     Is this an issue of both the soundhead and projector running slow i guess is that if the projector is running slow you have the wrong pulley i bet the main drive assembly was for a direct drive and the pulley is the wrong ratio  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-03-2011 04:18 PM                     Yep I think you're right Gordy. I'll just change the bottom gears on the vertical shaft to SA gears, use the SA pulley and that should do it. Thanks for your help. Don  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 02-03-2011 10:16 PM                        Is your goal to run 70 mm; I have several JJ optical soundheads/could swap. Louis  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-03-2011 10:35 PM                     Thanks Louis. I'm only running 35. I've always believed a JJ had a better 35mm picture than a SA. That's the only reason I'm doing the change. I guess I could always convert to the JJ optical head and re-install my CE red reader. Don  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-09-2011 03:20 PM                     OK, now that I've obtained a "selection" of pulleys can someone out there measure the pulley on the drive motor and the pulley on the JJ main drive and give the the diameters. My motor is a 1725 rpm. The picture head is a JJ-1 and the optical head is a TR-50 direct drive. The diameters in inches would be very helpful. I can't go by part numbers as my pulleys don't have any number on them. I could also use the part number on the main drive belt. Thanks  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-09-2011 04:14 PM                     Are they Polly-V pulleys or gearbelt? If Polly-V the motor and projector pulleys will be similar in size (not exact)...if you have gearbelt pulleys, I can try and look up the tooth count for you. -Steve  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-09-2011 05:00 PM                     Steve I've got gearbelt (timing belts) pulleys...NOT Poly V. These have the notches in them. Thanks for your help. Don  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-10-2011 08:05 PM                     Thanks for those who have helped. Problem solved. A JJ-1 fits perfectly atop a R3 optical head IF....you change the motor pulley from a 10 tooth to a 14 tooth. (gear drive pulley, not poly v.)  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 02-12-2011 06:27 AM                        JJ-1?? Serial number?? The first one is s/n 101. Louis  |  IP: Logged Don Furr Jedi Master Film Handler Posts: 509 From: Sun City, Ca USA Registered: Nov 2002 posted 02-12-2011 11:41 AM                     Louis it's a JJ-1 as opposed to a JJ-2 or JJ-3. Serial number of this one is 1070. Don  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 02-12-2011 04:21 PM                     The pair serial # 101 is installed at the Music Hall in Toronto  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 02-12-2011 06:01 PM                        I have 104 and 105 from Oakland CA. Louis  |  IP: Logged

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