Key (engineering) - WikipediaIn mechanical engineering/inspection, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable torque transmission. For a key to function, the shaft and rotating machine element must have a keyway.key way grinding,Making a Hardened Keyway Cutter and Keyed Bushing - TrueTeXNot having a keyway cutter or broach, I thought this would also be an excellent reason to experiment with making a hardened custom cutting tool. While grinding.
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