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Brass is a very good gear material.
The yield stress of many brasses is higher than that of many steels. Also the wear & friction properties are often better than steels.
Depends on the particular alloy & processing.
In general brass is a great material (expensive compared to steel, but good just the same.
Can't help you on lathing titanium. By the way, I recall trying to save weight in past years by using titanium. The problem we had was that not all titanium is created equal. The titanium that is available from small parts inc is not the top grade. Our investigation predicted that for the same strength, the titanium in the SPI catalog would weigh MORE than what we were trying to replace. FYI.
Joe J.
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