| 摘要 |
A tool measuring apparatus for a machine tool is provided with a plunger (16) mounted to move along an axis (22) to vary the spacing between the end of the plunger and an inductive element (26) of an inductive displacement measuring device (24). Device (24) generates a signal Vy which varies as a function of the spacing between the plunger (16) and device (24). Spindle (14), engaging a tool (12), is moved to a position M located a known distance from inductive element (26). As the spindle is moved to position M, tool (12) engages plunger 16 and moves the plunger to decrease the spacing between the plunger and the element (26) to a value S3, corresponding to an unknown length d of tool (12). Levels of Vy corresponding to spacing S3 and to S2, representing a known nominal value N of tool length, are coupled to a processor 32 and a control 30 to determine tool offset e, i.e., the difference between actual length d and nominal length N.
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