Ametek Surtronic 25, User Manual

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Surtronic S25
movements of the stylus relative to the skid are detected and
converted into a proportional electrical signal. The radius of
curvature of the skid is much greater than the roughness spacing.
This enables it to ride across the surface almost unaffected by the
roughness, and provide a datum representing the general form of
the surface. Even so, where the waviness is widely spaced it will
be necessary to use the pick-up with shoe, in conjunction with the
2.5mm (0.1in) cut-off.
Figure 5: the pickup is supported on the workpiece by the skid
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