Drilling machine

Details Drilling machine Drilling machine

1987-03-11

1989-05-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340664, 408 9, G08B 2100

Patent

active

048313645

ABSTRACT:
A drive motor connected to a drill bit serves to actuate the drill bit. An electric current is allowed to flow through the drive motor to activate the drive motor. A mechanism serves to feed the drill bit with respect to a workpiece. The current flowing through the drive motor is sensed. A device stores a value of the current which is sensed when the drill bit is out of engagement with the workpiece. A determination is made as to whether or not a drilling process is completed in accordance with a value of the present sensed current and the stored value of the sensed current.

REFERENCES:
patent: 4338556 (1982-07-01), Hetzel
patent: 4559577 (1985-12-01), Shoji et al.
patent: 4581711 (1986-04-01), Hirata et al.
DE-Z, Fertigungstechnik und Betrieb, 1984, 11, pp. 681-683.
DE-Z, tz fur Metallbearbeitung, 1984, 3, pp. 70-72.

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