Pneumatic roughness measurer

Details Pneumatic roughness measurer Pneumatic roughness measurer

1976-04-12

1977-04-26

Gill, James J.

Measuring and testing

Surface and cutting edge testing

Roughness

73 375, G01B 528

Patent

active

040193799

ABSTRACT:
A method for measuring the surface roughness of a workpiece, comprising filling two capacitors with a compressed gas at specific pressures; applying to the rough surface of the workpiece to be studied the open end of a bell-form sensor connected to a second one of the capacitors; evacuating simultaneously and individually to atmosphere the two capacitors, the first through a calibrated throttle, the second through the leak existing between the edge of said sensor bell and the rough surface of the workpiece; measuring, during evacuation, the difference between the pressures in the two capacitors; and deducing from this pressure differential, by standardization with sample pieces of known roughness, the roughness of the piece studied.

REFERENCES:
patent: 2901906 (1959-09-01), Emmons
patent: 2963900 (1960-12-01), Kuebler
patent: 3271997 (1966-09-01), Horne et al.
patent: 3482433 (1969-12-01), Gladwyn
patent: 3490058 (1970-01-01), Fortier
patent: 3855843 (1974-12-01), Yagiela et al.

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