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Author
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Topic: Drifting Focus
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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 10-17-2005 06:50 PM
PRO35 units from Ballantyne are one of the most unique, yet aggravating machines ever built. The plus being that the whole transmission is fully encased in an submerged oil bath with an oil fill on the outside of the case with an oil level marking.
Then, the other end of the belt pulley shaft is the cam for the intermittent (and a pretty good sized intermittent assembly as well)And ... there's that damned coupling device to frame with since the intermittent assembly doesn't roll on its axis as does the Simplex, or move up and down as with the Century and Christie.
But the intermittent shaft is split in two-one end with the starwheel and the other end holding the sprocket, with spiral grooving at each end of each shaft with a nylon coupler that slides back and forth between the spirals to "rotate" the intermittent sprocket for framing....) This was made so that the shutter didn't have to compensate for the attack (first sprocket hole) position of the intermittent sprocket. Dowser is a central hinged plate on the shutter shaft with a goofy type of spring selinoid to pull that thick plate of aluminum up.
PRO35's looked like it borrowed some parts from the Simplex, mainly pad roller assemblies, gate and trap parts (all flate gate variety) and shoes of sorts.
PRO's were mainly single lens models, with the exception of the MARK-VII that had the sliding lens bracket to hold both lenses-and the flat lens was a Magnacom lens since both lenses used one common base lens mounted in the lens frame.
If you know how to thread a PRO just right, they can be a very quiet machine. But if the loop sizes are a bit too small, or a bit too big, then these PROS can sound like thrashing machines beating themselves to death.
"Mr.Scott", if you want to "bone" up on a PRO-35, head to the manual section, open up the PDF on a PRO-35 manual and do some studying on these beasts. Here is some very good reading in store for you.
-Monte
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