Computer controlled universal grinder and method for grinding tr

Details Computer controlled universal grinder and method for grinding tr Computer controlled universal grinder and method for grinding tr

1989-06-19

1990-01-09

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51105EC, 51237M, 51291, B25B 500

Patent

active

048919144

ABSTRACT:
A grinding machine for grinding epitrochoidal, hypotrochoidal, and circular bearing races in one set-up without having to move the part and to insure near perfect concentricity between all of the bearing races.
A machine blank is mounted on an upper rotary table that is in turn mounted on a lower rotary table. The upper table is driven both by the lower table and by an independent servomotor. The net speed of the upper table is the difference between the two driving speeds of the tables. The axis of rotation of the upper table is capable of being offset from the axis of rotation of the lower table. The two tables are rotated in opposite directions while a grinding wheel is moved laterally into contact with the surface of a rough-machined part to form thr trochoidal surface. The characteristics are determined by the amount of the offset, the diameter of any rollers that are to be positioned between the trochoidal surfaces in the speed change device, and the relative speeds of the two tables. After the trochoidal surface or surfaces are completed, the lower table is stopped in its home position and the upper table is driven in order to grind the circular bearing race or races. Three independently-driven grinding spindles are provided.

REFERENCES:
patent: 3571911 (1971-03-01), Littwin
patent: 4186529 (1980-02-01), Huffman
patent: 4584794 (1986-04-01), Hirohata

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