| 摘要 |
The invention relates to methods of and apparatus for controlling relative movement between a cutting device and an object to be cut and is particularly useful to regulate movement of an abrasive cut-off disc to compensate for wear of the disc. The invention utilizes the known fact that the drive motor for the disc requires less power when the disc is out of contact with the work than when the disc is actually cutting the work. An electrical control circuit is responsive to the amount of power drawn by the motor, to return the cutting disc to its non-cut position immediately after the disc has cut through the work.
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