Geometrical instruments – Area integrators – Electrical
Patent
1977-07-25
1980-01-22
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
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.
Hachisu Masuo
Tatsumi Youji
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Seiko Seiki Kabushiki Kaisha
Stearns Richard R.
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