Measuring spindle 1 contacts workpiece a being inspected. Lug 4,
mounted rigidly on spindle 1, carries stop pin с and prevents
rotation of the spindle. Lug 4 is connected by a spherical pair
to lever 5, used for m an u ally advancing and retracting spindle
1. Armature 2 is secured to the housing by flat spring 3, which
is bent to a right angle. At its left end, armature 2 has bracket'#
along which slide 7, carrying wedge b, travels. Slide 7 is adjusted
by screw 8 and is used to set the relative position between
spindle 1 and armature 2. R ectangular coils 9 are fitted on core
10. The magnetic circuit consists of core 10 and yoke 11. Screws
12 and 13 lim it the displacement of armature 2. The measuring
force is determined by the combined action of springs 3,
14 and 15. The clearances between armature 2 and the magnetic
circuit vary w ith the size of workpiece a. This varies the inductance
of the coils. The inductance is used as a measure of workpiece
size.
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