- 25,000(HPS250)&50,000(HPS500) min-1(rpm) Meets micro mill and drill manufacturers spindle speed requirements for many applications where small hole drilling and light milling are required. - Uninterrupted Machining Fully tool changeable spindles for transfer from the machine magazine to the main spindle without the need to connect the air supply - High Precision Spindle All spindles are guaranteed to be less than 1μm T.I.R, in spindle taper allowing for excellent surface finish and extended tool life. True High Speed Machining can be achieved with the high speed and accuracy of the HPS250/500. - No Main Spindle Wear Machines main spindle is used only to hold the HPS Spindle, providing longer main spindle life. Running a machine spindle at the machines maximum rpm for extended periods of time will severely affect the machines longevity. - Positioning Block We provide the positioning block to mate the HPS spindle with the machine. Several designs are available depending on the machine manufacturer and machine model and year of manufacture.