Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1980-03-07
1981-05-12
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116577, 318571, B24B 4900
Patent
active
042663750
ABSTRACT:
A feed control apparatus wherein a servomotor control device responsive to feed pulses distributed from a numerical controller controls a d.c. servomotor to advance a grinding wheel carriage of a grinding machine through the rotation of a feed screw successsively at a speed-up feed rate, a rapid feed rate, a slow-down feed rate and a grinding feed rate. A detection device is provided, which outputs a velocity checking signal to an abnormality confirmation device when the carriage reaches a velocity checking point defined within a slow-down feed range. When confirming that the feed rate of the carriage has exceeded a reference feed rate lower than the rapid feed rate, the abnormality confirmation device applies a stop signal to an emergency stop control circuit in response to the velocity checking signal, so that the rotation of the servomotor is immediately discontinued.
REFERENCES:
patent: 3576979 (1971-05-01), McCall
patent: 3934185 (1976-01-01), Schoonover
patent: 3996454 (1976-12-01), Froyd
patent: 4115958 (1978-09-01), Englander
patent: 4160937 (1979-07-01), Fiorini
Enomoto Minoru
Nishimura Hideo
Ohmura Haruo
Shimizu Norihiko
Tokura Yasufumi
Toyoda-Koki Kabushiki-Kaisha
Whitehead Harold D.
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