Heavy-duty construction with powerful, long-life motor for use all day, everyday. Provides 88+ minutes of continuous use at full load with less than 1% RPM loss from the stated maximum. Capacitor motors supply the extra current required during start-up and running under load. Large diameter armature shaft with shielded ball bearing. For general purpose grinding including sharpening, shaping, deburring, stock removal, and cleaning of rust and scale.