Method and apparatus for measuring runout in a cylindrical objec

Details Method and apparatus for measuring runout in a cylindrical objec Method and apparatus for measuring runout in a cylindrical objec

1981-02-27

1983-11-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356376, G01N 2186

Patent

active

044171471

ABSTRACT:
In a method and apparatus for determining runout in a cylindrical object, particularly a cutting or boring tool such as a drill bit or reamer, the object is rotated and a collimated beam of light is directed transversely at the rotating object so as to cast a shadow on a photosensor which produces an electrical signal having a current level representative of the area illuminated. Runout in the cylindrical object is manifested as a reciprocal variation in the area of the shadow cast on the photosensor, with a resulting periodic variation in the the output signal of the photosensor. The amplitude of this variation is determined to provide a measure of the total indicated runout of the object. In the preferred embodiment, a pair of photocells is positioned behind the rotating object and a differential amplifier and low-pass electronic filter are employed in series to separate variable signal components arising from runout from variable signal components due to profile variations in the object, for example, flutes in a twist drill.

REFERENCES:
patent: 3308302 (1967-03-01), Fuhrmann et al.
patent: 3529169 (1970-09-01), Heaney et al.
patent: 3544796 (1970-12-01), Baker
patent: 3604940 (1971-09-01), Matthews
patent: 3922094 (1975-11-01), Colding et al.

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