Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-12-15
1994-09-20
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
408 6, G08B 2100
Patent
active
053493370
ABSTRACT:
Peck drilling operations using a drilling tool with a rotatable bit are controlled according to the present invention. A control computer is used to detect various drilling conditions, such as dull or broken bits, transitions between different materials in a workpiece and a breakthrough condition. The control computer continually monitors the thrust and torque applied to the drill bit. A separate feed amp and computer having a pre-programmed feed motion routine for controlling the feeding movement of the drill bit signals the control computer when the bit is in a peck cycle. The control computer is responsive to an indication that the bit is a peck cycle for ignoring the thrust and torque readings during the peck cycle. By determining when the bit is in a peck cycle, the control computer is able to differentiate between a normal peck cycle and other drilling conditions, such as a dull or broken drill bit, transition between materials or breakthrough.
REFERENCES:
patent: 4088899 (1978-05-01), Miller et al.
patent: 4514797 (1985-04-01), Begin
patent: 4559577 (1985-12-01), Shoji et al.
patent: 4697964 (1987-10-01), Daiko et al.
patent: 5115473 (1992-10-01), Oketani et al.
EOA Systems, Inc.
Swann Glen
Thompson Daniel V.
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