When electromagnet 1 is rotated
about fixed axis D , it in duces
eddy currents in metal
workpiece 2 being inspected.
Interaction of these currents
w ith the field of electromagnet 1
develops a torque which turns
workpiece 2 in the direction opposite
to the rota tion of electromagnet
1. Workpiece 2 bears
against fixed jaw a and is held
against th is jaw by movable
jaw d, which is rig id ly secured
to measuring spindle 3 of the
measuring device. This device
checks the roundness of workpiece
2.
$4372$SmE,M$