Interruptible feed rate drilling system

A drilling system having at least one infeed drive motor and at least one tool drive motor for driving a cutting tool which comprises:

• a. at least one controller for generating drive signals;
• b. an electrical relay for selectively interrupting the infeed drive signal to said infeed drive motor in response to an externally generated signal;
• and
• c. an oscillator adapted for generating a range of selectable frequency signals coupled to said relay.

A drilling system having an infeed drive motor and a tool drive motor for driving a cutting tool which comprises:

• a. at least one controller for generating drive signals at least one of which is an infeed drive signal;
• b. an electrical relay for selectively interrupting the infeed drive signal to said infeed drive motor in response to said generated signal;
• and
• c. an adjustable variable frequency generator adapted for generating a range of selectable frequency signals coupled to said relay.

A computer controlled drilling system for drilling material comprising:

• a. at least one cutting tool;
• b. at least one drive motor for rotating said tool;
• c. at least one drive motor for in-feeding said cutting tool into the material to be drilled;
• d. means for in-putting selection data;
• e. means for determining from said selection data a frequency value for use in generating command signals;
• f. means for generating a series of command signals based on said frequency value;
• and
• g. means for out-putting said command signals to said in-feeding drive motor.