Method for measuring eccentricity

Details Method for measuring eccentricity Method for measuring eccentricity

1993-01-27

1994-03-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, G01N 2186

Patent

active

052910261

ABSTRACT:
A method for measuring eccentricity uses two radial gratings, in annular areas of which elementary patterns are provided at equal intervals so that the patterns of one radial grating are opposite to those of the other radial grating rotated by 180.degree.. Reference lines are provided on a rotary axis having eccentricity to be measured, coordinate axes relative to a bisector of the patterns opposite to each other are provided parallel with the reference lines, and spaces between the coordinate axes and the reference lines are measured, thereby allowing the shift of the rotary axis to be found. Thus, the eccentricity of the rotary axis can be measured with high accuracy.

REFERENCES:
patent: 3553469 (1971-01-01), Stutz et al.
patent: 4524347 (1985-06-01), Rogers
patent: 4883955 (1989-11-01), Kawasaki et al.
"Method of measuring rotation tolerance of high-accuracy rotary axis and its problems" Masaji Sawabe Oct. 1979 Precision Instrument, vol. 45, No. 10.

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