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This topic comprises 2 pages: 1 2
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Topic: Century Intermittent problems
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 06-30-2002 01:47 AM
John, I re-read your post. It is highly unlikely that the second one would go out like that, especially if it ran ok before. I would recommend you check your gear mesh. The movements have a little adjustable stop tab on them. It could be set for too loose or too tight of a mesh. If it was set for one machine, that does not mean "one fits all". What I have done, (although it may not be politically correct) is to loosen the little bolt that holds that stop key in place, install the movement, set it for a very small backlash in the gears, (notice I said small backlash) and tighten the movement down. Then I roll the machine through by hand, and check the backlash setting at different points to make sure it is not binding. After I am satisfied with that, I tighten the little locking screw on the stop tab after I physically position the stop tab aginst the stop. (sounds like double talk, but you will see what I mean when you eyeball it.)As far as the camshaft end play is concerned, that can be adjusted while the movement is installed in the projector, although it is best to have it out of the projector. That big shiney screw you see is basically a plug. Remove that, and inside you will see the screw that is used to adjust the cam shaft end play. I set that setting to just a "contact fit". The end play will then go away. Be careful....don't make that adjustment unless you need to. If you tighten it too much, you'll probably ruin the movement. For the dwell or indexing adjustment is concerned, I don't do that unless the movement is removed from the machine. That adjustment requires a "pussy touch" (please pardon the pun) to be successful. There are two little set screws that are used to make that adjustment. However, all the parameter screws have to be just a slight tad loose so the faceplate of the movement can position itself to get the right dwell. Then you have to tighten down all the parameter screws, and check it again, along with the camshaft end play adjustment. It may take several attempts to get it right. If you never did this before, I suggest you don't unless Mark steps you through on these adjustments. If you go at it yourself for the first time, you could really screw up the intermittant movement. If anyone sees any fault in the way I set them up, please blast me. If I am doing it wrong, I want to learn how to do it right, and not half-assed!!! Thanks
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John Westlund
Expert Film Handler
Posts: 204
From: Burney, CA, USA
Registered: Jun 2001
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posted 06-30-2002 02:10 AM
Let me clarify this a little bit. The noise is more then a ticking. On the movement that mark has now it was growling and violently shaking the projector. The film was jumping out of frame and was slowing down. We shut it down and then when I tried to switch the motor on and the projector would not turn over. I may also add that the intermittent itself was extremely hot, so hot that you couldnt touch it without burning your finger. It was the hottest on the cap that holds the sprocket on. When I took the sprocket off I had to really work at getting that end cap off the shaft. It was stuck on there pretty good.Paul, that is basically how I set the gear mesh. I did away with the stop and just moved the movement until it wasnt too loose but so that it was not binding up while turning it over by hand. Hope this helps. Thanks for all the info.
John
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Paul G. Thompson
The Weenie Man
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 06-30-2002 02:19 AM
Hmmmm.....This is an edit. Was that your old movement that was growling? I can see that happening of the starwheel bushing was on its way South... If it was just a "ticking", it is probably a dwell adjustment.
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Pete Naples
Phenomenal Film Handler
Posts: 1565
From: Dunfermline, Scotland
Registered: Feb 2001
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posted 06-30-2002 06:41 AM
Two things spring to mind.Are you getting the flywheel on tight enough? Some of the latest ones will not tighten correctly once they've been removed, I end up drilling and tapping the flywheel to take a bigger screw (One which has a diameter closer to the hole in the intermittent inupt shaft). I've found countless of new'ish ones where no matter how tight you the screw, the flywheel still moves slightly on the shaft which makes a horrible noise! How much gate tension are you running with? I've seen new and rebuilt intermittents wrecked in a very short space of time due to excessive load placd on them by grossly excessive gate tension. I've always thought that you should be able to get teh picture to jump at the minimum setting, then increase until it just goes steady. Too many people turn it up and leave it up, also too many machines I've come across have the trap set up so that minimum tension is not really minimum! The points made about gear mesh and shaft end float are very very vaild indeed. Century intermittents are pretty robust mechanisms if set up properly.
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