Patent ID: 7286949

Claim:
A method of error correction of one or more measurements of one or more workpieces taken using a coordinate positioning apparatus in which each workpiece is mounted on a bed of the apparatus and a workpiece sensing probe is moved relative to the bed into a position sensing relationship with each workpiece and a position reading taken, and in which means are provided for measuring at least a function of an acceleration of the probe relative to the bed, the method comprising the following steps, in any suitable order: (a) measuring a workpiece; (b) determining one or more repeatable measurement errors from a predetermined error function, look-up table or map; (c) measuring at least the function of the acceleration of the probe and calculating one or more non-repeatable measurement errors as the workpiece is measured; and (d) combining the repeatable and non-repeatable measurement errors in steps (b) and (c) to determine one or more total errors; and (e) using the total errors determined in step (d) to correct measurements of the workpiece taken using the coordinate positioning apparatus.