How to choose the CNC spindle or milling head according to the material?

 It is very important to choose the right spindle or milling head. The professional spindle is a spindle controlled by a brushless induction frequency converter. It is located on a ceramic bearing and has a closed engine room. It is absolutely equipped with a metal casing. We can choose the spindle speed and power.

  The spindle speed is the nominal value on the nameplate (12.000, 15.000, 18.000, 24.000, 40.000 rpm), this does not mean that the spindle always rotates in rotation. The speed can be controlled by the inverter, but you must remember that the spindle power is the torque multiplied by the speed. Therefore, while retaining the torque and reducing the speed by half, the power will also be reduced by half. Here we must make concessions...

  There is no universal spindle. The higher the spindle power, the larger the diameter of the bearings, and these bearings are the reason for the speed limitation of the spindle. The larger the bearing diameter, the greater the centrifugal force of the ball pressing the centrifugal force against the running track of the outer ring of the bearing, thereby releasing more heat (one way to reduce this effect is to use lighter ceramic balls). Therefore, spindles with 40.000 rpm are usually only produced in the low power range.

High speed is the best choice for aluminum, wood, composite materials, laminates and other materials. When processing steel, especially stainless steel, thermoplastics or HSS drills, high speed is not suitable.

  As for power, the main criteria are the maximum diameter of the milling cutters to be used and the materials processed with these milling cutters. For processing plastics, wood or laminates with tools not exceeding 5mm, the spindle (0.8kW 24,000 rpm) is sufficient. Therefore, tools not exceeding 8mm-1kW spindles and tools not exceeding 12mm-3.3kW spindles are not exceeding 16mm -5.6 kW spindle of cutter. For steel, we should first choose a spindle with a lower speed (15,000 to 18,000 rpm), and choose a milling cutter with a maximum of 10mm-3.3kW, a milling cutter with a maximum of 12mm-5.6kW, and a milling cutter with a maximum of 16mm-7kW. 20mm cutter-10kW spindle.

  If you plan to drill steel, you must always choose a more powerful spindle, because, for example, if you want to drill steel with a 6mm drill bit using a 5.6mm 2000 rpm 18,000 rpm spindle, our power is only 0.6kW. You cannot compare the power of the spindle with the power of a traditional milling machine because they have gears and do not need such a torque reserve. One more thing. The sustainability of this spindle is up to 10 years...