Apparatus for measuring the waviness of a workpiece surface

Geometrical instruments – Area integrators – Electrical

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33174Q, 364560, G01B 712, G01B 731, G06G 778

Patent

active

041842634

ABSTRACT:
An apparatus for measuring the roundness and waviness of workpiece surfaces comprises a first peak-to-peak detector for detecting the absolute peak-to-peak value of the sum of a signal representative of the roundness error of the workpiece and a signal representative of the eccentric center of the workpiece. A low-pass filter passes only the low frequency eccentricity signal which is applied to a second peak-to-peak detector for detecting the absolute peak-to-peak value thereof. The outputs from both detecting devices are fed to an arithmetic means for effecting subtraction of the absolute value of the output signal from the second peak-to-peak detector from that of the first peak-to-peak detector thereby obtaining a signal representative of the peak or maximum amount of waviness of the workpiece surface at or near the point of maximum eccentricity error and unaffected by any eccentricity error.

REFERENCES:
patent: 3180031 (1965-04-01), Roeger et al.
patent: 3222791 (1965-12-01), Huntley et al.
patent: 3615143 (1971-10-01), Barr et al.

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