I didn't know what this was until I saw a picture of it in the Atlas Lathe operation book. It's for rebuilding electric motors. After the armature is trued, the mica insulation needs to be undercut by a grinder mounted on this bracket.
DESCRIPTION: USED, RUNNING, PRECISE GRINDER AND MOUNT BRACKET. 120V; 3.3AMP; 1/4HP; 1/4" COLLET; 45000 RPM. THE GRINDER RUNS, BUT I NOTICE SOME CRUCHY SOUND COMING FROM THE INSIDE OF THE CORD.
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