Touch probe

Details Touch probe Touch probe

1993-08-25

1994-10-11

Will, Thomas B.

Geometrical instruments

Gauge

Movable contact probe, per se

33558, 33561, G01B 520

Patent

active

053535146

ABSTRACT:
A touch trigger probe for a coordinate measuring machine or machine tool has a stylus (14), which is biased into a rest position. The stylus has two independent supports, provided within a housing (10). In the embodiment of FIG. 1, the first support comprises a skirt (18) of a stylus holder (12), which is axially constrained on a surface (20) of the housing (10). The second support comprises a kinematic arrangement of cylinders (34) and balls (36), together with a planar spring (30), which together provide lateral constraint. The first support is biased by a much lighter force than the second support, so that its friction is very low. This reduces the lobing and hysteresis of the stylus movement, and thereby increases the accuracy of the probe.

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"A Numerically Controlled Measuring Machine," H. J. Elton et al., Feb. 1963, Control, pp. 71-75.

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