Vintage Johnson Hand Crank Armature Lathe - $35 (Gilbert)

Vintage Johnson Hand Crank Armature Lathe 1

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model name / number: 6023180500

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Vintage 1942 (US Patent 2281307) tool made by the Johnson Engineering Co., Ferguson, MO. Unique design clamps into a vise and grabs onto the motor or generator shaft using split tapered bushings. I think the tool was tapped onto the shaft with a soft mallet. The cylindrical center has what looks like a turned finish, which is ingeniously used to provide longitudinal feed when the housing casting is tightened with a wingnut. The housing is internally "threaded" around the cylindrical center, which acts as a leadscrew and feeds the adjustable cutter across the commutator surface when the big handle is turned. A hinged sliding sawblade undercuts the mica to avoid shorting the windings with metal burrs or chips. After the armature is reconditioned, it's ejected from the split bushings by turning the T handle, which pushes it out. Nothing is to be seized. Constructed of cast pot metal or zinc with steel parts.

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post id: 7945495034

posted: 2026-07-06 12:27

updated: 2026-10-05 12:43

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Vintage Johnson Hand Crank Armature Lathe - tools - by owner - sale...