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Overtravel unit

The overtravel unit protects the PHS1 probe head in the event of a collision by deflecting and providing an electrical signal which can be used by the CMM controller to stop machine motion.

A kinematic joint held in place by a coil spring enables the body to relocate itself once any obstruction has been removed.

NOTE: The head must be re-datumed in the event of overtravel.

Information on the re-datuming procedure is given in the PHS1 programmer's guide (Renishaw part number H-1000-6005).

The following figure shows the location and deflection capability of the overtravel unit:

Overtravel unit deflection:

PHS1 overtravel unit - labelled