Machine tool

Details Machine tool Machine tool

1982-02-10

1984-05-29

Briggs, William R.

Gear cutting, milling, or planing

Milling

Including means to infeed rotary cutter toward work

408 11, 408 17, 409186, 409194, B23C 900, B23B 3900

Patent

active

044511876

ABSTRACT:
A machine tool comprising a rotary drive unit rotating a tool or workpiece, a load torque detecting device disposed between the rotary drive unit and the tool or workpiece rotated thereby, a linear drive unit moving one of the tool and the workpiece toward and away from the other, a main start switch for actuating the rotary drive unit, and a control device. The control device starts the rotary drive unit upon actuation of the main start switch; starts the linear drive unit to allow the tool to initiate a cutting operation on the workpiece when a variation in a load torque within a given period detected by the detecting device has decreased down to a first preset limit; and reverse the operating direction of the linear drive unit to interrupt the cutting operation if and when a difference between a load torque currently detected by the detecting device after the start of the linear drive unit and a load torque detected by the detecting device after the decrease of said variation to the first preset limit and before the initiation of the cutting operation, has exceeded a second preset limit.

REFERENCES:
patent: 3451293 (1969-06-01), Takezawa
patent: 3545310 (1970-12-01), Porath et al.
patent: 4180356 (1919-12-01), Hoch

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