The grinding stone revolves slowly, no more than around 100 rpm, dipping into a water bath as it does so. It has everything needed to ensure perfect sharpening! All jigs and accessories fit both the T7 and T3. We recommend the Tormek T7 if you need to sharpen HSS steel for Logosol’s machines, as its bigger motor can deal with higher grinding pressures. Both models have high quality motors and shafts made of stainless steel. T3 has a strong plastic stand, and the stand for the T7 is made of steel plate.