Louis Ohland wrote:

What books are a good place to start on gears? This is looking at
gears used for positioning mechanisms and rotational movement.

No truck transmissions, just applications useful for lathe and mill work.

To apply them, or to machine them?

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Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html