MACHINING SPINDLE SPEED PROBES

摘要

Spindle speed probes (6) and spindles including such speed probes. The speed probe (6) is arranged to sense the speed of rotation of a shaft (5) making use of a magneto resistive sensor (3). The magneto resistive sensor (3) is arranged in a stack with a circuit board substrate (62), an electronics module (61) and a permanent magnet (2). An additional magnet (8) may be provided to provide additional drag to help prevent undesirable windmilling.