Method and apparatus for computing allowable spindle rotation speed
First Claim
1. A spindle apparatus comprising:
- a main shaft mounted for rotary movement;
a tool detachably mounted on the main shaft;
a motor for rotating the main shaft about an axis;
vibration means for vibrating the main shaft;
sensor means for detecting a displacement of the main shaft when the main shaft is vibrated by the vibration means and providing an output signal indicative of the displacement of the main shaft;
allowable revolution speed computation means for calculating an allowable revolution speed of the main shaft on the basis of the output signal of the sensor means; and
drive means receptive of a signal indicative of the allowable revolution speed of the main shaft calculated by the allowable revolution speed computation means for driving the motor to rotate the main shaft within a speed range which does not exceed the calculated allowable revolution speed.
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Abstract
A spindle apparatus comprises a main shaft mounted for rotary movement, a rotating device for rotating the main shaft about an axis, a vibration device for vibrating the main shaft, a detecting device for detecting a displacement of the main shaft when the main shaft is vibrated by the vibration device and providing an output signal indicative of the displacement of the main shaft, a calculating device for calculating an allowable revolution speed of the main shaft on the basis of the output signal of the detecting device, and a drive source for driving the rotating device to rotate the main shaft within a speed range which does not exceed the allowable revolution speed. When an end of the main shaft is vibrated by the vibration device, a displacement of the vibrated main shaft is detected by the detecting device which provides an output signal indicative of the detected displacement. The calculating device calculates an allowable revolution speed of the main shaft on the basis of the output signal of the detecting device and outputs the calculated allowable revolution speed to the drive source. The drive source drives the rotating device to rotate the main shaft within a speed range which does not exceed the allowable revolution speed.
13 Citations
13 Claims
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1. A spindle apparatus comprising:
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a main shaft mounted for rotary movement; a tool detachably mounted on the main shaft; a motor for rotating the main shaft about an axis; vibration means for vibrating the main shaft; sensor means for detecting a displacement of the main shaft when the main shaft is vibrated by the vibration means and providing an output signal indicative of the displacement of the main shaft; allowable revolution speed computation means for calculating an allowable revolution speed of the main shaft on the basis of the output signal of the sensor means; and drive means receptive of a signal indicative of the allowable revolution speed of the main shaft calculated by the allowable revolution speed computation means for driving the motor to rotate the main shaft within a speed range which does not exceed the calculated allowable revolution speed. - View Dependent Claims (2, 3, 4, 5)
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6. A spindle apparatus comprising:
- a main shaft mounted for rotary movement;
rotating means for rotating the main shaft about an axis;
vibration means for vibrating the main shaft;
detecting means for detecting a displacement of the main shaft when the main shaft is vibrated by the vibration means and providing an output signal indicative of the displacement;
calculating means for calculating an allowable revolution speed of the main shaft on the basis of the output signal of the detecting means; and
drive means for driving the rotating means to rotate the main shaft within a speed range which does not exceed the allowable revolution speed. - View Dependent Claims (7, 8, 9)
- a main shaft mounted for rotary movement;
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10. A method for controllably rotating a main shaft within a speed range which does not exceed an allowable revolution speed, comprising the steps of:
- providing a rotatable main shaft;
vibrating the main shaft;
detecting a displacement of the main shaft resulting from the vibration thereof and providing an output signal indicative of the displacement;
calculating an allowable revolution speed of the main shaft on the basis of the output signal; and
rotating the main shaft within a speed range which does not exceed the calculated allowable revolution speed. - View Dependent Claims (11, 12, 13)
- providing a rotatable main shaft;
Specification