Measuring spindle 1, contacting workpiece a being inspected,
slides in the hole of core 3 in coil 4. Screwed on spindle 1 is
armature 2, consisting of two round disks. The pickup has two
coils, 4 and 5, whose magnetic circuit is formed by cores 3 and 6,
the pickup housing and plates 7. Spring 8 provides the required
measuring force. The clearances between armature 2 and the
magnetic circuits vary w ith the size of workpiece a. This varies
the inductance of the coils. The inductance is used as a measure
of the workpiece size.
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