Patent ID: 7755754

Claim:
A calibration device for use in an optical, part measuring system, the device having a height along a central axis and a plurality of regions which are rotationally symmetric about the axis, the device comprising: a series of step-shaped portions defining a multi-step region having a plurality of step edges wherein at least one of the step-shaped portions begins at the same height along the axis that a respective adjacent step-shaped portion ends along the axis at one of the step edges and wherein a profile of the multi-step region contains information for calibrating the system; a plurality of cylindrically-shaped portions spaced apart along the axis and defining constant diameter regions containing information for calibrating the system; and a frustum-shaped portion defining a pair of spaced, slope edge regions and a sloped region having boundaries marked by the pair of slope edge regions wherein the frustum-shaped portion has first and second diameters at its boundaries which define a range of diameters of parts capable of being measured in the system and wherein a profile of the slope edge regions and the sloped region contains information for calibrating the system.