The 5 Best Mini Metal Lathes Reviewed. With a size of 36 x 17.3 x 14.6 inches, this metal lathe has a 7 x 14 swing bed, digital speed readout, a 4-inch chuck, 11 gears for changing feed rate speed, an emergency stop switch, variable speed knob control, a power indicator, and a spindle speed of 100-2500 RPM.