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Topic: Signs of a worn intermittant?
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Monte L Fullmer
Film God
![](http://www.film-tech.com/ubbmembers/2797c.jpg)
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 01-07-2005 04:16 AM
How's the INTermittent sprocket?
does the sprocket have notches cut across the base of the sprocket teeth? If the base of the tooth is grooved lengthwise, this will cause some of that vertical jitter since the film is actually being "hooked" as the film slides into the groove as it's being pulled down, then "snags" going out when the film is leaving the tooth when the sprocket is turning to pull down the next frame, instead of the smooth, continual pull and release of the film as a new/normal sprocket would do.
Also, is the sprocket the "narrow tooth" variety (a sprocket designed for the smaller "fox sprocket hole" prints for magnetic sound), or is the normal "wide tooth" variety? Narrow tooth variety had a small tendency to wear sooner due to the smaller pull area of the tooth than the wider version.
Also, does the teeth of the sprocket looks "hooked" - teeth that looks like they are leaning backwards? If this is so, either reverse the sprocket, or replace. "Hooked" sprockets are good for this as well.
Check gate/trap tension, for this will be some of the faults of the excessive sprocket wear.
good luck- Monte
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