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What is a gear train?

If the gear that is turned by hand or by a motor is called the driver gear, what is the gear that it turns called?

What does an idler do?

If the driven gear has half as many teeth as the driver gear it will...

When more than one gear is on the same shaft the mechanism is called a what?

What does a rack and pinion gear do?

Name two gear mechanisms that change the direction of rotation by 90 degrees?