Diamond blade operating speeds base on 9500 SFPM (Surface Feet per Minute). Diamond blade cutting depths listed above are approximate. Actual cutting depth will vary with the exact blade diameter, flange and saw types. The optimum blade RPM will depend on the machine and material and may vary from these values. The optimum RPM range for concrete and masonry products is +/- 10% of the recommended RPM listed in this chart. The optimum RPM range for hard, dense materials such as natural stone and tile is 10~25% less than the recommended RPM listed in this chart.