Update 10/10/2018: Serviced by Makita under warranty. The technician said the nut holding the gear was loose, he fixed it and the mill is great! Source Review 1 πUsed to grind the pipe, lightly indent it with a 1/8th grinding wheel. Took about 5 minutes of full use before the "clutch" failed. It spins, but as soon as you start grinding the disc, it "jumps" and stops.