Tool for making roughing and finishing cuts in a workpiece

Details Tool for making roughing and finishing cuts in a workpiece Tool for making roughing and finishing cuts in a workpiece

1988-06-17

1989-04-04

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

To move radially

408188, 408200, 408223, 408227, B23B 5100

Patent

active

048181560

ABSTRACT:
A drill for performing a roughing cut in a workpiece as the drill is advanced, and performing a finishing cut as the drill is retracted. A blade carrier is mounted eccentrically on the drill to be movable between first and second positions. In the first position, the blade is located for a roughing cut. In the second position, the blade is shifted radially for a finishing cut. A spring biases the carrier toward the second position and yields when the carrier moves to the first position. The spring bias is too weak to overcome reaction forces acting on the blade during a roughing cut, wherein the roughing cut reaction forces cause the carrier to be shifted to the first (roughing cut) position. The spring bias is strong enough to overcome the weaker reaction forces occurring during a finishing cut, so that the carrier is automatically shifted to the second (finishing cut) position when the drill is withdrawn through the workpiece. Thus, the blade is automatically shifted from the roughing-cut position to the finishing-cut in response to the initiation of a movement of the tool in a direction of withdrawal through the roughly cut hole.

REFERENCES:
patent: 1547108 (1925-07-01), Ellis

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