The Hollow Shaft Kamlock (HSK) system design features a 1:10 taper with face contact which has 60% better rigidity than 7:24 taps, and unrivaled accuracy and repeatability of ≪2μm. It is balanced for 40,000rpm, making it essential for aerospace blisk rotor machining and optical lens grinding and polishing. Internal cooling channels, through-spindle coolant (up to 10 MPa), and tool changers which reduce tool change times to under 3 seconds further improve deep-cavity milling performance.