The pitch diameter of a gear can be thought of as the outside diameter of the friction wheel.

Name: The pitch diameter of a gear can be thought of as the outside diameter of the friction wheel.
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The pitch diameter of a gear is conceptually similar to the outside diameter of a friction wheel, as it represents the diameter at which the gear teeth effectively engage with the teeth of another gear or rack, similar to how the outer surface of a friction wheel would make contact.

The Pitch Diameter of a Gear Can Be Thought of as the Outside