Jig. A device for holding work and guiding the operating tool.
Jointing-machine. A machine for truing the surfaces of wood-work that are to form a joint.
Journal. That part of a shaft that runs in a bearing which guides or limits the motion of the shaft.
Jump or upset. To enlarge at the end by a forging process.
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Kerf. The passageway or slot cut by a saw.
Key. A rectangular wedge for locking two pieces together.
Knife. The cutting tool used on a wood-planing or wood-splitting machine.
Knurling-tool or milling-tool. A tool used to press indentations into the edges or upon the surface of metal, in order to increase the hand grip of it.
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