Method of monitoring and controlling the seating of screws to the optimum point of grip independent of screw size and material density

  • US 7,091,683 B1
  • Filed: 10/22/2004
  • Issued: 08/15/2006
  • Est. Priority Date: 10/24/2003
  • Status: Active Grant
First Claim
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1. A method of controlling a motor (106) used to drive a screwdriver bit (105) such that screws (107) are seated to the optimum point of grip between the screw (107) and the work piece material, the method comprising:

  • (a) detecting a torque of the motor;

    (b) determining a time when the torque reaches a maximum by an average means for determining an average value as a function of a current value and a new value, thereby determining the optimum point of grip; and

    (c) stopping the motor at the optimum point of grip.

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