I agree that you can't have both worlds. The best power solution I can think of is to install a 3 phase 2 speed motor that is inverter rated and run with a 1:1 or lower belt ratio. This gives a spindle rpm of lets say 300 to 2500 low speed and 600 to 5000 high speed. So far as torque is concerned. By reducing the ratio to 1 : .75 you can still get around 4000 rpm high with improved torque. Even when using a 3/4" end mill you still want at least 1500 in aluminum and 750 in steel for optimum material removal. The only application I can think of requiring high torque / very low speed is when drilling very large diameter holes ( 5/8" + ) with a drill bit. If its CNC, you can mill them. My RF-45 came with a 2 speed motor from the factory so I am set to experiment when I get around to it. |