PROBE EMULATION AND SPATIAL PROPERTY MEASUREMENT IN MACHINE TOOLS

摘要

A method of sensing contact between a first member (606, 908) and a second (608, 910) member in a computer numerical control machine, wherein the position of at least one of the first member and the second member is controlled by one or more servo mechanisms, the method including the steps of: causing at least one of the first member and the second member to be driven towards the other; monitoring an error signal in one of the servo mechanisms; and detecting when the error signal exceeds a predetermined threshold.