Development of a Single Pulse Micro EDM System and to Manufacture Micro Spherical Probe Used in Micro CMM

The focus of this research is the development of a single pulse micro EDM system and to manufacture micro spherical probe used in micro CMM. In the single pulse micro EDM system contain unsteady-state multi-degree oscillation circuits to control the transistors’ switches. This configuration is to achieve the adjustment of pulse-off time of the micro-electrical discharge machining system. Investigating the effect of pulse voltages on the critical discharge gaps, the experimental results show that maximum discharge gaps are linearly proportional to the pulse voltages. This tendency serves as the basis for the machine processing parameters. And used of the single pulse micro EDM system to machining micro spherical probe.The micro spherical probe with a diameter smaller than 100 μm, is made by a single pulse micro EDM system with the method of wire electro discharge grinding (WEDG). The current study uses tungsten carbide (WC) as the material for the stylus. Experimental results show that, the micro spherical probe roundness could amount to 2 μm.