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Topic: Correct gear replacement Simplex XL
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Frank Angel
Film God
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Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 02-06-2007 10:03 AM
We had to have some gears in a Simplex SH1000 replaced because of an oil tube that was showing good oil level when actually there was none in the unit (the tube gets clogged -- simple thing but devastating if you're not aware). The brass gears stripped.
Anyway, when the unit came back from being refurbished, the fiber transmission gear (from soundhead to mechanism) makes a rather nasty whining noise. Another projectionist said that there were actually two different transmission gears, nearly identical, for that soundhead -- one to mate with the Simplex XL head and another for a Century. They look so similar that you can't tell the difference by looking at them. If they put the wrong gear in there, it will sing like the fat lady.
He said he's been in a booth where both projectors had the wrong gear and they ran them that way for the entire three years he was there and, aside from how loud the booth noise was, nothing bad happened.
In our case, you would think you would see some image vibration or possibly a wow/flutter in the sound given the nasty noise this thing makes, but everything looks fine, which kind of verifies my friend's experience.
Does anyone 1) know if indeed there are different gears for this soundhead and if so, what might be the part number for the correct gear for a Simplex XL head? And 2) how much damage, if any, can I expect from running with the wrong gear?
As you can see, the Simplexes seem to be conspiring to giving me noisy headaches this week.
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Dave Macaulay
Film God
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Posts: 2321
From: Toronto, Canada
Registered: Apr 2001
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posted 02-06-2007 11:44 AM
Well. The SH1000 gear/pulley is always the same like Gord says. A Century on an SH soundhead drives without any idler and the projector gear for it wouldn't work on an XL, so your buddy's story is a bit suspect. The projector drive gear and the idler gear have to match the soundhead gear, which doesn't change on the soundhead to accomodate projectors. The RCA and Western Electric soundheads that drive the XL pretty much the same as the SH1000 have various different gear pitches or angles, and you would have a problem if you used their idler and/or projector gears with an SH1000. Normally when refurbishing a soundhead one wouldn't even see the XL projector drive gears since they're attached to the projector, did you have the idler or drive gear replaced? The XL projector drive gear (on the projector shaft) for an SH1000 is PN P-1539. The XL/SH1000 idler gear is G-1826. The SH1000 large steel drive gear/pulley is SN-259. You can find the drive kit parts listed in the projector parts book. If either or both of the 2 projector gears were wrong - projector or idler - it would sound pretty bad I guess. Probably the fiber or plastic idler gear would get ruined in any case, the steel gears should be OK. The most likely problem is too tight or too loose meshing of the gears. Loosen the projector head and push it away from the soundhead gear then set the idler mesh against the projector gear, there should be a slight play through a whole turn. The soundhead/idler mesh is set by moving the projector, same deal with a bit of play through the full turn. You can adjust it by sound if you're brave, set the hold-down bolts snug and tap the projector fore and aft gently until is stops whining from being too tight. If the adjuster screw is still there (rather too often it disappears) make sure it allows a bit of play, you can shift the projector one way with it if you so desire. The SN-259 soundhead gear may have been damaged somehow too in shipping.
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