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Abstract

A calibration gauge for use in calibrating a lens cutting/grinding machine has a disk with a concentric post on one of its faces for chucking the disk to a lens spindle. A target delineated on the other face of the disk consists of bands aligned on the X and Y axes and intersecting at the center of the disk. The width of the bands is not greater than the acceptable error in positioning of the X and Y axes. The calibrating operator sets a limit of Z-axis motion of the lens spindle corresponding to a selected depth of cutting/grinding a lens. The gauge is chucked to the lens spindle. The X-axis position of the tool is aligned by computer with the Z-axis. Rotation of the tool spindle is initiated and the lens spindle is raised to plunge cut/grind the gauge. The lens spindle is lowered and rotation of the tool spindle is terminated. The gauge is dechucked and the depth of the cut/grind is measured. The difference between the measured and selected depths is determined. The Z-axis calibration of the lens spindle is jockeyed by use of the computer to compensate for the difference. The operator also observes the quadrant position of the cut/grind center on the gauge to determine its displacement from center. The X-axis calibration of the tool is then jockeyed by use of the computer to compensate for X-axis displacement and the Y-axis calibration of the tool is manually adjusted to compensate for the Y-axis displacement.

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