Film-Tech Forum ARCHIVE: JItter and ghost, shutter knob "racked"

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Topic: JItter and ghost, shutter knob "racked"

David E. Nedrow
Master Film Handler

Posts: 368
From: Columbus, OH, USA
Registered: Oct 2008

posted 03-13-2011 08:52 PM

Randy,

I'm pretty happy now with the light/ghost balance. Basically, I have the shutter angle set such that I have zero ghosting when running with the shutter adjusting knob centered. Move that knob a tiny bit either way, and ghostliness ensues.

Probably time to move the jitter issue to a different thread.

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Randy Stankey
Film God

Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99

posted 03-13-2011 09:19 PM

Okay, so you have checked your trap?

Clean. All parts that are supposed to be tight are tightened and those that are supposed to be lose are free? Check those lateral guide wheels at the top. If they are not aligned correctly they can cause weave but if they don't spin freely, they can cause jitter. Start at the top of the gate and follow the film path all the way down the gate until the film exits the intermittent.

Check your trap bands and your shoe rails. Clean and tight? The band tensioning screws? The tension adjust mechanism?

Check your intermittent sprocket for hooked teeth. Check your intermittent pad shoe for cleanliness, alignment and proper tension.

It's hard to explain every detail of troubleshooting the film path like this because a lot of it has to do with experience and intuition. Yes, the film path has to be set up in a specific way and, if it's not, trouble will occur but there have been dozens of times when people have reported trouble to me and standard explanations couldn't pin down the problem.

I can't tell you how many times people have reported problems like jitter to me and they couldn't figure out what the cause was but, when I went there, I quickly discovered that there was a piece of crud in the pad shoe or something like that. Often, a well-placed drop of oil was all that was needed.

Go down through that whole gate area, clean it up real good and pay attention to anything that isn't right. It's always a good place to start.

Do the easy stuff first. Right?

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