The lathe-type undercutter can be quickly attached in place of the tool post on any lathe. It can be mounted directly on the cross slide or on the slide carriage which is then mounted on the cross slide. Both horizontal and vertical commutators can be under cut. -

As undercutting is done from the side of commutator the saw or V-cutter is set level with the lathe centers. A spring between hardened washers under the pulley allows the spindle to move (float) up or down and follow and existing slot that is being re-cut.
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