High Speed Spindle Kit, HiTorque Mini Mill

These pulleys change the spindle speed range to 5000 rpm max. The increased speed is great for small cutters such as those used for engraving. Just remember that doubling the speed will cut the torque in half. It's important to have high speed bearings. Most LittleMachineShop.com HiTorque Mini Mills have high quality and high-speed bearings BUT the standard bearings on most mills are not rated to 5000 rpm. --see the Chris' Tips tab. This high-speed spindle kit uses the same belt as the standard drive pulleys. The pulleys are easy, but if you have to change the bearings you have to press the spindle out and back in. A hydraulic press makes it an easy task. Switching pulleys to the original set shouldn't take more than 20 minutes. *NOTE: We do not have installation instructions completed yet, so you are on your own for installation.