Detecting system and method for cutting tools

A position detecting method for detecting a position cutting tool, comprising:

• providing a laser sensor comprising an emitter and a receiver;
• moving the cutting tool above the laser sensor, and controlling a rotational speed of the axis of the cutting tool to a preset speed;
• turning on the emitter to emit a laser beam towards the receiver;
• moving the cutting tool towards along a direction perpendicular to and coplanar with a straight line connecting the emitter and the receiver, computing a first time of how long the emitter emits the laser beam and a second time of how long the receiver receives the laser beam, and recording a first position of the cutting tool at a moment when the second time is less than the first time;
• keeping on moving the cutting tool along the direction, computing the second time, and recording a second position of the cutting tool when the second time remains changeless for a predetermined amount of time;
• computing a difference between the first and second positions along the direction;
• and
• determining whether the cutting tool is eligible or off-centered according to the difference, wherein the cutting tool is determined to be eligible if the difference is equal to about zero, and wherein the cutting tool is determined to be off-centered if the difference is not equal to about zero.

A size detecting method configured for detecting a size of a cutting tool, comprising:

• providing a laser sensor comprising an emitter and a receiver;
• moving the cutting tool above the laser sensor, with an axis of the cutting tool perpendicular to and coplanar with a straight line connecting the emitter and the receiver, and controlling a rotational speed of the axis of the cutting tool to a preset speed;
• turning on the emitter to send a laser beam towards the receiver, and computing a first time of how long the emitter emits the laser beam;
• recording a first position of the cutting tool when the cutting tool is at a midpoint between the emitter and the receiver;
• moving the cutting tool along a direction perpendicular to the straight line and the axis of the cutting tool, and determining a second time of how long the receiver receives the laser beam, recording a second position of the cutting tool if the second time is greater than the first time, and keep moving the cutting tool if the second time is not greater than the first time;
• computing a difference between the first and second positions along the direction to obtain a radius of the cutting tool.