Copying machine notably for grinding concave surfaces

Details Copying machine notably for grinding concave surfaces Copying machine notably for grinding concave surfaces

1975-06-10

1977-04-12

Smith, Gary L.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51101LG, 90 133, B24B 1300, B24B 1702

Patent

active

040166821

ABSTRACT:
Grinding machine of the copying type for grinding a concave surface of an article such as a lens blank, comprising a templet having a concave surface identical with that to be obtained on the article and with a mean sphere. The machine also comprises a pair of supports for the templet and the article, respectively, which are both rotatably driven in synchronism about two parallel axes, a movable copying head carrying a pin-point contact feeler engageable with the templet and a rotatably driven grinding wheel, and means for guiding the copying head so as to impart thereto a component of movement of rotation about fixed axis passing through the center of the mean sphere of the concave surface of the templet. This axis is parallel to a straight line passing through the centers of symmetry of the feeler and grinding wheel, while the distance between said straight line and the fixed axis is variable.

REFERENCES:
patent: 765268 (1904-07-01), Bishop
patent: 1478334 (1923-12-01), Grefe
patent: 3041789 (1962-07-01), Cretin-Maitenaz

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