Abstract
Our "R"-ZERO is a tool holder with a new concept that can adjust the run-out accuracy of the cutting edge as close as to "zero". It is most suitable for high-precision hole making with drills or reamers. Moreover, it greatly prolongs cutting tool life in the case of small diameter drills or endmills. In this manuscript, mechanism and features of "R"-ZERO holder will be explained, showing actual cutting examples to verify that high run-out accuracy of the cutting edge will result in excellent machining quality.
