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Topic: How to change a worm gear.
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Richard C Patchett
Master Film Handler
Posts: 424
From: Flint Mi 48506
Registered: Dec 2007
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posted November 01, 2008 10:45 PM
Worm gear replacement is major overhaul. To change it requires EXTENSIVE dis assembly of the mechanism (once it's removed from the projector of course!). Once you start dissembling the mechanism you lose all the critical adjustments which require the special (expensive) Bell & Howell tools & jigs to readjust/realign. The new gears are colored black to distinguish them from the old style plastic
It takes at least 4 to 6 hours to open / replace that worm gear / and to REASSEMBLE your B&H correctly.
Average cost worm gear replacement job costs around $250 per machine. but it's well worth it because you get a guarantee and the new style worm gears are made of much superior materials that the projector will provide many, many more years of use
One could replace only the cracked worm gear, but it is almost the farthest thing into the projector. Half the labor is expended just accessing it. And, the projector probably wouldn't be happy and might have wow in sound and picture instability, because sprocket spindles may be dry of lubrication, a sprocket gear may be warped, sound head needs attention, shuttle needs adjustment, uneven take up drive, etc., etc.
Oh by the way I'm in Michigan Thank you Chip for the referral [ November 02, 2008, 02:35 PM: Message edited by: Richard C Patchett ]
-------------------- RC’s Classic Collection 16 mm Parts & Service Elmo, Eiki, Bell & Howell + http://www.rcsclassic16mm.com/
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Brad Kimball
Phenomenal Film Handler
Posts: 1171
From: Highland Mills, NY USA
Registered: Jun 2003
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posted December 29, 2008 11:55 PM
I called KMR about 18 months ago and the gent on the phone (I'm assuming he was the owner, but I'm not positive) said that he never liked slot-loaders and that he only repairs auto-loaders. He also went on to say that it would be very expensive and that unless there was some special sentimental reason for repairing what I had - it would probably be in my best interest (financially) to simply discard what is no longer functioning properly and seek out another 2nd hand machine. I don't entirely disagree with his assessment. However, truth be told, at what point are you spending more for replacements than what it would cost to fix ole "Belle" (this is what I call my B&H models - I refer to them as "Belle" 1, "Belle" 2, etc.). It's silly, yes, but I believe everything, organic or not, has some kind of personality and it helps to inflate the respect for all things great and small by giving them a name. I prefer slots because in the event of a calamity you can get in there mighty quick and there's less risk of "chewing" up yard after yard of celluloid.
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