Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1980-08-20
1982-10-05
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
408 10, 408 13, G05B 1924
Patent
active
043530184
ABSTRACT:
An improved control system for facilitating tapping work in a machining center of the type which performs a variety of machining operations automatically. Control is effected by establishing and maintaining a certain relationship between the operation of a spindle motor which rotates a tap, and the operation of a Z-axis feed motor which transports a table longitudinally of the tap, the table mounting a workpiece. Specifically, the spindle motor and Z-axis feed motor are driven in relation to one another at all times in such a manner that the equation N.sub.s =f.sub.m /P will be satisfied, where N.sub.s (rpm) is the rotational speed of the spindle motor, f.sub.m is the feed speed of the table along the Z-axis, and P is the thread pitch of the tap. Apparatus for controlling the spindle motor includes a control circuit which is adapted to stop the spindle at a prescribed angle of rotation.
REFERENCES:
patent: 3346894 (1967-10-01), Lemelson
patent: 3604998 (1971-09-01), Haught et al.
patent: 3720135 (1973-03-01), Merner et al.
patent: 3725651 (1973-04-01), Cutler
patent: 4086517 (1978-04-01), Yamaki et al.
patent: 4266171 (1981-05-01), Mashimo
Fujioka Yoshiki
Kohzai Yoshinori
Dobeck B.
Fujitsu Fanuc Limited
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