Controller for boring apparatus

Details Controller for boring apparatus Controller for boring apparatus

1990-06-19

1991-04-16

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With randomly-actuated stopping means

Responsive to condition of tool or tool-drive

408 11, 408 15, 408 16, 408 76, B23B 4514

Patent

active

050077767

ABSTRACT:
A controller for a magnetic base drill unit provided with a safety circuit which is constructed by connecting in series a relay provided with contacts for cutting the power supply to the drill motor and feed motor, a resistor and a diode. The relay is actuated when a voltage higher than the predetermined voltage to be applied to the feed motor in the hole cutting mode is applied to the feed motor during the hole cutting, thereby cutting the power supply to the drill and feed motors. The controller has a means for confirming the operation of the safety circuit which apply a test voltage higher than the maximum predetermined voltage to be applied during the hole cutting to the feed motor in the fall mode of the electric drill.

REFERENCES:
patent: 2977825 (1961-04-01), Buck
patent: 4559577 (1985-12-01), Shoji et al.

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