Renishaw Plc

Richard John Hoodless

James Reynolds Henshaw

David R McMurtry

Peter Geoffrey Holden

Marcus Ardron

David Jonathan Walshaw

Thomas I Mackintosh

David Morris

A method of applying a marking onto a metrological scale. The method includes locating one or more markings on the scale substrate in a provisional state; checking whether the one or more markings located on the scale substrate are acceptable; and finalizing the one or markings which are acceptable so as to transform the one or more markings into a finalized state.

Metrological scale

A method of applying a marking onto a metrological scale. The method comprises locating one or more markings on the scale substrate in a provisional state; checking whether the one or more markings located on the scale substrate are acceptable; and finalising the one or markings which are acceptable so as to transform the one or more markings into a finalised state.

Disclosed is an optical measurement scalecomplementary scale readerfor determining displacement between the scale and reader. The scaleand readerare adapted for use with a liquid C which provides optical communication between the scaleand the reader. The liquid C is preferably machine coolant or oil. The scale is preferably a stainless steel strip having periodic markings thereon. The scale reader has a windowwhich may have a hard coating (FIG.) thereon, e.g. diamond-like carbon, to prevent surface damage. The scale and reader may be mutually displaced with a shortage of liquid without undue adverse affects. Rotary mutual displacement between the scale and reader is discussed.

Determination of displacement

There is disclosed: a measurement scale suitable for use with scale reader for determining displacement; various tracks all for holding the scale and all having a channel into which the scale is magnetically attracted; and a scale tensioner which in use tensions the scale in situ by release of a preload, prior to the scale being secured to a substrate, the tensioner being removable thereafter.

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Bristol, United Kingdom

Richard John Hoodless