Electromagnetism law measures torque to be the fatigue fracture that prevents main shaft in machine tool treatment, need tries to monitor to the torque on its. Used magnetic field built-in technology (EMD-Embedded Magnetic Domain) straight formula sensor can satisfy this kind of requirement. This technology had had more successful application inside dynamical tool domain, be like: Pneumatic or dynamoelectric spanner, dynamoelectric screwdriver, apply its on machine tool cutting tool gradually. This technology has the following advantage: ◆ cost low ◆ can realize blame contact to measure ◆ to measure volume of precision tall ◆ light ◆ of small, weight is right circle, quadrate axis all measurable below the working principle that introduces EMD sensor: Above all, to measuring an object (it is working axis usually) undertake magnetizing, the magnetic field of the generation on the axis gets the place that follow an axis the change of torque and change. Next, be apart from sensor park place of axial 10 Mm, at this moment but the change that accurate induction gives the magnetic field on the axis, output corresponding torque value through displaying screen. Manufacturing business United States rests closely the sensor that company of root FAST science and technology provides two kinds of standards: TM-HR-Sq series, use at checking axis of quadrate and sectional drive (sunken / protruding) , a variety of parameter offer an alternative. TM-HR-Rd series, use at checking round axis, can be rectified with machine tool, cutting tool and be an organic whole, can apply in harsh environment. This company is developing the sensor that applies to OEM. According to producing business introduction: Product of this kind of EMD has the following characteristic: ◆ because this kind of sensor need not contact the object that be measured when measure, this makes blend in its the measure simplification that existing machine tool designs. ◆ makes sure through high frequency sampling its measure precision ◆ high reliability, the temperature of contaminative ◆ job that strong; of interference rejection ability gets dirty content, fluid or other and congener material not easily is in F of ° of 40 ° F-132 at the same time, EMD sensor can be installed between position of head of machine tool main shaft and clip of cutting tool outfit, the torque that because all sorts of elements are caused,monitors changes, can have measured value and good value comparative, be installed in order to decide or change the optimal opportunity of cutting tool. In addition, round axis sensor can be light the ground is compositive to existing machine tool, because this EMD sensor can make manufactory home fast, the improves existing machine tool performance of low cost, the technological process that affects product quality to those makes quick response hand-in-hand travel is revised. EMD technology is opposite for newer, the firm that uses this technology need not worry too lead and fluky, this company emphasizes, they are tightening close cooperation with processing factory of a metal, improve EMD sensor ceaselessly according to producing medium use situation. CNC Milling