(57) A gauge for a grinding machine for in-process gauging of a cylindrical off-axis region
of a workpiece, in particular a crankpin (18, 20) of a crankshaft, comprises a pair
of parallel struts (48, 50) each pivoted from a rigid support mounted on and movable
with a wheelhead (10) which incorporates a grinding wheel (12, 14). The free ends
of the struts are pivotally jointed to a plate (40), from which is pivoted a link
(36) whose other end is pivotally attached to the gauge or probe (22). A pair of fingers
(24, 26) incorporating transducers extend from the gauge around opposite sides of
the crankpin for measuring its diameter while being ground. The strut (50) is reciprocated
up and down by a servo drive (64) such that, in conjunction with the horizontal motion
imparted by the wheelhead, the gauge is caused to follow substantially the same path
as the workpiece region.
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