Machine tool with fault detection

Details Machine tool with fault detection Machine tool with fault detection

1997-05-20

1999-04-20

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

318 35, 36447419, 408 5, 408 9, B23B 3500

Patent

active

058951776

ABSTRACT:
A machine tool includes a spindle having a cutting tool for cutting a workpiece. For fault detection, a control unit of the machine tool detects a value representing a torque applied on the spindle while the spindle is stopped in a state the cutting tool is engaged with the workpiece. The control unit further compares the detected value (representing a torque) with a predetermined threshold thereby to determine that a fault has occurs. Since the detection of the value representing a torque is performed while the spindle is stopped, the detection is free from the effects of acceleration or deceleration of the spindle.

REFERENCES:
patent: 3545310 (1970-12-01), Porath et al.
patent: 4351029 (1982-09-01), Maxey et al.
patent: 4478538 (1984-10-01), Kakino
patent: 4550277 (1985-10-01), Carney
patent: 4656868 (1987-04-01), Azuma et al.
patent: 5155473 (1992-10-01), Oketani et al.
patent: 5414632 (1995-05-01), Mochizuki et al.

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