Film-Tech Forum ARCHIVE: Century SA Framing Carriage Assy

This is topic Century SA Framing Carriage Assy in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by John Walsh (Member # 168) on 01-24-2009, 05:31 PM:

Looking for suggestions on what might be wrong with this projector. This SA has the turret with that framing knob you have to push in to engage the gear... the background here is I think someone at this location was out of frame and tried to force the framing far enough to fix it. The brass gear on the framing shaft (the one on the projector, not the turret)stripped off of the end. I can just change the shaft, but there's another problem ...

When I turn the framing shaft, the intermittent 'carriage' doesn't go up. Rather, it sort of pivots in a CCW way, (when looking at the back) which I think makes it bind, and won't move. I'm sure the rack and pinion is not damaged, just whatever guides the carriage.

Anyone seen this before?

Posted by Tim Reed (Member # 137) on 01-25-2009, 01:46 AM:

The Intermittent Carriage Gib (part #GI-0001 in the book) is probably loose, or needs to be snugged up against the carriage. This is a nickel-plated "bar" on the left side of the carriage assembly, when viewed from the gear side, and it presses a flat spring against the carriage to create friction.

It's difficult to adjust, and you just about need a third hand to defeat the spring tension. You loosen one of the big screws holding GI-0001 to the frame, then frame the intermittent the other way to access the other screw. With the gib loose, you can then press it flat against the carriage and tighten the screws back (that's the difficult part, because you have to move the intermittent before it's totally secured).

Someone else may have a better way of going about this, but that's the way I've done it. [Smile]

Posted by Louis Bornwasser (Member # 3063) on 01-25-2009, 06:59 AM:

Yep: that's the way. WE used a custom-fit block of wood to compress/hold tension on the spring while tightening both screws. Louis