8mm Forum: ST1200HD Gate Jitter

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Topic: ST1200HD Gate Jitter

Claus Harding
Phenomenal Film Handler

Posts: 1149
From: Washington DC
Registered: Oct 2006

posted September 13, 2008 12:10 PM

I have a second 1200 which is either going to get fixed or used for experiments. Right now, it transports ok, but there is a quick side-to-side jitter in the gate that shows on the screen. It varies a bit if I squeeze on the pressure plate, but doesn't go away.
And simple solutions? Or complex ones? [Roll Eyes]

Claus.

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"Why are there shots of deserts in a scene that's supposed to take place in Belgium during the winter?" (Review of 'Battle of the Bulge'.)

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Tony Stucchio
Jedi Master Film Handler

Posts: 625
From: New Jersey
Registered: Dec 2005

posted September 13, 2008 03:57 PM

Does that happen with all films? I get a slight side-to-side jitter on some films, but lubricating the film with Film Renew usually fixes it.

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Claus Harding
Phenomenal Film Handler

Posts: 1149
From: Washington DC
Registered: Oct 2006

posted September 13, 2008 06:00 PM

Tony,

No, I tried different films and they exhibit the same look: fast jitter and also showing what looks like the right side of the gate in the picture. Something is out of whack. For some reason, it runs better in reverse; it almost eliminates the jitter.

So what? Pulldown trouble? Gate bent? Too little/too much tension on the pressure plate? I am open to ideas.

Claus.

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"Why are there shots of deserts in a scene that's supposed to take place in Belgium during the winter?" (Review of 'Battle of the Bulge'.)

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted September 13, 2008 06:54 PM

Have seen this before on Elmo's and its usually down to the Claw being out of position so that it's hitting the edge of the sprocket.

If you lay some film in the gate with the gate open and hold it in place with your finger. Turn the mechanism with the knob on the front of the machine and see if the claw is hitting the edge of the film. It should not hit the sprocket at any point of its travel.

If you are seeing the edge of the film on screen it would suggest that someone in the in the past has moved the position of the fixed edge guide.

To set this up properly you really need to use an SMPTE test film however you may be able to set the position again by readjusting the edge guide but it's fiddly without a test film. Only adjust this part if you are sure the image is not correct on screen otherwise there are adjustments in the rear of the machine for adjusting the claw position.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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