Ken,

I have to disagree with you about the use of aluminum bronze where rubbing
is involved.  I manufacture worm speed reducers and that's all rubbing.  I
personally have made destructive tests to check on the AGMA's bronze
recommendations for sliding surfaces.  SAE bronze with a 9% to 11% al.
content galls both the steel worm and the bronze worm gear.  The recommended
bronze to use, where sliding wear needs to be limited, is SAE 92.  It has
lead in it an that's what's needed.
Arthur
Mexico City

 

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