Posts: 791
From: Northridge, CA USA
Registered: Jun 2003
posted December 06, 2005 12:59 PM
quote: I transferred the motors (including the pulleys) . . . . and the problem didn't transfer. (still 4:48 on the questionable machine.
Did you change the cam tank as well? (That's usually easier than pulling the shutter pulley since they changed the clutch assembly.)
If you changed both the motor and shutter pulley and the motor, then you have a possessed machine. The transformer doesn't have anything to do with the motor. Just unplug it from both machines for the test and see if you change the problem.
The new machine isn't one with "international" wiring by any chance? I've got one of those by some strange method and they're really wired differently than the US product.
Posts: 69
From: San Francisco, California 94131
Registered: Nov 2004
posted December 08, 2005 03:42 AM
quote: Did you change the cam tank as well? (That's usually easier than pulling the shutter pulley since they changed the clutch assembly.)
No, haven't swapped out the cam tank [yet].
quote:(That's usually easier than pulling the shutter pulley since they changed the clutch assembly.)
The stop clutch and shutter pulley come off together with the cam tank assembly.
quote:If you changed both the motor and shutter pulley and the motor, then you have a possessed machine.
So far I've exchanged just the motor with the motor-pulley on it's shaft.
The wiring for both machines is identical.
The cam tank including it's clutched shutter pulley is next.
Any ideas how these identical looking cam tank assys could affect the speed?
Thanks
John
-------------------- Antique Video Transfer Service 2" Quadruplex videotape to DV/DVCAM digital transfers 5001 Diamond Hts Blvd. San Francisco, CA 94131-1621 www.antiquevideo.com antvid@antiquevideo.com
Posts: 791
From: Northridge, CA USA
Registered: Jun 2003
posted December 08, 2005 09:35 AM
quote: Any ideas how these identical looking cam tank assys could affect the speed?
Yes, the pulley on the shutter shaft is slightly smaller than it should be. If you find some masking tape that you can wrap around the pulley and fit into the groves then that will enlarge it and make the projector run a little slower. The smaller the shutter pullley, the faster the projector will run since the motor pulley will turn at a constant speed. You might even rry the tape test before you remove it. If that's the problems (and you seem to have changed everything else) then you'll have to replace that part.
Posts: 69
From: San Francisco, California 94131
Registered: Nov 2004
posted December 08, 2005 11:55 PM
quote: Yes, the pulley on the shutter shaft is slightly smaller than it should be.
I removed the cam tanks today . . . the pulleys look as if they match . . . interchanged the tanks. . . .
The "control" projector which 'ran' at normal speed now runs the 5 minute test film in 4:48.
The previosuly "fast" machine now runs the 5 min test in 04:56. [nearly the 5 minute mark].
Can a cam tank make this much difference?
[where's my micrometer]
-------------------- Antique Video Transfer Service 2" Quadruplex videotape to DV/DVCAM digital transfers 5001 Diamond Hts Blvd. San Francisco, CA 94131-1621 www.antiquevideo.com antvid@antiquevideo.com
Posts: 791
From: Northridge, CA USA
Registered: Jun 2003
posted December 09, 2005 09:09 AM
quote: Can a cam tank make this much difference?
Yes, and you found the problem. It's the shutter pulley on that cam tank (nothing in the cam tank changes speeds). It doesn't take much to have that speed difference which is why I'd test it with masking tape to build up the small pulley and check the speed. Do one wrap and test and if still fast, add a second wrap and test.
Since I think they went to CNC, there are probably a lot of shutter pulleys around that run at that speed--or there was a slight change in the motor pulley and shutter pulley and you just have the wrong combination. But in any event, the fix is the shutter pulley from a "parts" machine. Unfortunately the SL machines that I have for parts don't have clutches and have have plastic shutter pulleys that have the shutter blade mounted to the pulley (no clutch parts). Also since the sprockets on the SL are a different size than the SSL, the worm gear is different on the cam tank shaft.
Posts: 69
From: San Francisco, California 94131
Registered: Nov 2004
posted December 09, 2005 03:04 PM
John, thanks for the technical support and explanations while I tare down these two machines & swap parts.
I started tinkering and put them both back together before checking diameters closely with a "myc" . . . rats. . .
I'll look for a scrap SSL on eBay and take it's cam tank pully. Thanks for your help . . you sure know this stuff inside out.
Regards,
John Pommon
-------------------- Antique Video Transfer Service 2" Quadruplex videotape to DV/DVCAM digital transfers 5001 Diamond Hts Blvd. San Francisco, CA 94131-1621 www.antiquevideo.com antvid@antiquevideo.com