Encoder scale member and method for mounting

An encoder scale member configured to be used with a coordinate positioning apparatus comprising a mounting surface, a motion guide mountable on the mounting surface, and a first member comprising a sensor configured to sense scale markings, the first member being mountable on the motion guide so as to be moveable with respect to the motion guide while mounted, the encoder scale member comprising:

• a first set of scale markings that are, in use, sensable by the sensor;
• and
• at least one mounting feature that allows at least part of the encoder scale member to be fixed between the mounting surface and the motion guide by being sandwiched therebetween, and allows the encoder scale member to be supported by the mounting surface at least in the vicinity of the first set of scale markings.

A method for mounting an encoder scale member to a coordinate positioning apparatus comprising a mounting surface, a motion guide mountable on the mounting surface, and a first member comprising a sensor configured to sense scale markings, the first member being mountable on the motion guide so as to be movable with respect to the motion guide while mounted, the encoder scale member comprising a first set of scale markings that are, in use, sensable by the sensor, the method comprising the steps of:

• (i) taking the mounting surface, motion guide, and encoder scale member;
• and
• (ii) sandwiching at least part of the encoder scale member between the mounting surface and the motion guide to retain the encoder scale member therebetween such that the encoder scale member is supported by the mounting surface at least in the vicinity of the first set of scale markings.