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Topic: Chinon SS1200 Rewind Problem-I'm stumped
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted March 05, 2017 05:14 PM
Thanks Rik, manual now downloaded. Ok, on the new machine, I checked the voltage across the connections when in rewind mode with no reel on, this was 5.0v give or take. I loaded a elmo 12ft reel full to the brim, and placed an empty one on the front again an elmo. I then placed in into rewind and checked the voltage, 13v to start with, gradually reducing back down as the reel got more empty, about half way it was at 10v or so, and slowing down quite a lot. By the time it finished the voltage was back to just about the starting voltage of 5.0v. Now this is on the brand new machine, not the scrapper. So even on the new machine this slows down a lot more than I was expecting, the scrapper voltage 4.0v to start with and about 10 v max under the same conditions, belt tension about the same, turning the hubs without reels on, to me about the resistance. The scrapper could not complete the rewind and just stopped about 300ft or so from the end, it would go again with a bit of help from me. The motor looks like the same one that's on the elmo. I'm looking at the manual to see if there is a measurement like on the elmo for tension or torque setting for clutches, it looks just too simple for any of this stuff though, will check on the scrapper.
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted March 07, 2017 03:54 PM
Hi Alan, Ok in rewind position with reels on the front and back hubs with film ready to rewind. The rear hub will turn because its connected only by the fact that the film is joining the two reels together, and this is making the thing turn not anything in the front gear train. As mentioned in my previous comments the gear cannot connect to both front and rear gears its just not big enough, and it would trash the gears in the process. Next thing I did, this is with the scrapper, connected a separate power supply to the motor, and set this to our 13.9v, with a empty reel on the front hub, and a full one on the back hub, into rewind, connected a multi meter at the connection points to monitor voltage drop. No voltage drop, current draw was 500 milliamps to start with and 3 times this at the end, it did not stop once, just slowed down towards the end, but could have done a bigger reel I feel. Now this is a scrapper and I have not adjusted the torque resistor either. One other thing I should mention here is that the gear on the motor actually moved out of position, outward, I did wonder if this was the initial culprit and slipping on the shaft, I think I will try to glue this in position and see if this helps. I could not turn this by hand, but the torque at some point may be able too. I would add that the noise you can hear is the one gear that connects the motor to the two gears, this wears on the shaft because this has no bearing so is moving slightly side to side as it rotates, if you grab the gear you can move it, the new one is quieter because of this.
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