| 摘要 |
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.
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