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Topic: What problems do you have with 5 star sound heads?

Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 04-23-2006 12:31 PM

I really doubt if the correct losses can be introduced into that conversion to make it perform as a true davis tight loop

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 04-23-2006 12:46 PM

Actually it does work fine but takes longer for the stabilizer to reach speed. It's still a tight loop no matter how you look at it. Eliminate the Silicon loaded damper roller and its not a tight loop any longer its then more an SH-1000.

Mark

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 04-23-2006 05:36 PM

IF one were to remake the sound drum to eliminate the recess where the inboard Lateral guide roller sits and then apply rubber drive tires to both lateral guide roller halves, it would work very well and eliminate the picture contact area.

Something that should be done to "Brad's" design is to have a stop screw such that the wrist of the assembly can't push the film down into the recess of the drum. Ever noticed that the Century LGRs have stop screws so they don't have contact with the drum?

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Ian Bailey
Master Film Handler

Posts: 317
From: Nambucca Heads, Australia
Registered: Jun 2003

posted 04-24-2006 02:39 AM

Thanks for the picture Dan.
So the only thing holding the film against the sound drum is the metal inside edge of the Lateral guide roller.Am I right in saying that the film is only being held on one side?...as far as I know the same point on the outside edge of the lateral guide roller does not come in contact with the sound drum.
To me it just doesn't look like there is enough holding the film against the sound drum to stop the film tracking laterally which would effect the sound quality.Also if the projector is left running with no film and the lateral guide roller engaged then you would have metal to metal contact which couldn't be good.
Narrow rubber tyres that line up with the outside edges of the print would be the go.
Ian

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Monte L Fullmer
Film God

Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004

posted 04-24-2006 04:10 AM

quote: Ian Bailey
To me it just doesn't look like there is enough holding the film against the sound drum to stop the film tracking laterally

Granted, it does fool you on how it looks, but it really does work, and works pretty slick.

The trick is to have that film taught so the film doesn't have the chance of being weak in that area of the guide rollers - to where the stiffened edges DO hold up the guide rollers pretty well.

-Monte

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