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.