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A rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque.
This is quite daunting when you first start model engineering as there is a lot involved and quite a lot of equipment is required.
My method uses a Hobbymat MD65 lathe as the base with a dividing plate fixed to the rear of the headstock spindle and a Unimat 3 milling attachment bolted to the cross-slide with a gear cutter held in the milling chuck.
This allows the gear blank to be held in the lathe chuck and indexed round whilst the teeth are cut by traversing the milling head on the saddle. The Hobbymat MD65 and setup for gear cutting.