| 摘要 |
A method and apparatus for registering a datum position between two components of a machine tool having a path of relative movement, wherein relative movement of the components in path is monitored and a beam of parallel electro-magnetic radiation is directed from a source on one of the components across path of relative movement. A receiver is provided for receiving the beam at one position in relative movement between the components to define a datum position. Electro-magnetic radiation received at receiver location is monitored and used to detect when the radiation received is equivalent to one half of the full beam emitted by the source to define datum position.
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