When the electrode approaches the workpiece infinitely, a phenomenon of electric spark breakdown of the electrolyte occurs, which in turn corrodes the metal surface. The distance between the workpiece and the electrode when the discharge phenomenon just occurs is called the spark gap. The main factors affecting the size of the spark gap in electric discharge machining are: discharge parameters, conductivity of the electrode and workpiece, type, viscosity, and fluidity of the electrolyte, etc. Therefore, even if the electrode is made precisely, there will still be a few micrometers of error in the spark gap. Secondly, taking the example of a right-angle electrode moving in a square motion, when the right-angle part of the electrode discharges, it actually radiates in a fan shape (this is also why the shape of the worn electrode is arc-shaped), and the radius of the fan shape is determined by the spark gap. Therefore, theoretically, electric discharge machining cannot produce a right angle. Even when using negative current for machining, the radius of the generated fan-shaped area will be greater than 0.007 micrometers. Coupled with electrode wear, the right angles produced by general discharge machining are actually rounded corners with a radius of more than 0.02 mm.

Therefore, during the electric discharge machining process, the common method is to first conduct a trial machining, then measure, and adjust the machine based on the results to achieve the desired machining state.

Maintenance of the main components of the electric discharge machining machine.

Maintenance of the high-pressure water pump: The high-pressure water pump of the electric discharge small hole machine generally works under a pressure of 7 MPa. The bearings bear a lot of pressure, and if the lubricating oil inside the pump body is not replaced regularly, it can lead to very serious consequences for the high-pressure water pump. We should strengthen our awareness of prevention. The high-pressure water pump is a very important component; if this component has a problem, it will affect the operation of the entire electric discharge small hole machine.

Maintenance of the electric discharge rotating head: Like the high-pressure water pump, the rotating head also works under high pressure and requires regular replacement of sealing parts. If there is a water leak, it is possible that water has already penetrated the bearings, and at that time, the bearings need to be replaced.

Principles of routine maintenance for electric discharge machining machines: After use, clean the workbench. Regularly clean the dust inside the electrical cabinet, especially the dust on the machine's circuit board, as this helps with the heat dissipation of electrical components. If the dust on the circuit board is not removed regularly, over time it can easily corrode and cause machine failure, requiring the replacement of the circuit board.