The side machining in EDM created by lateral electrodes produces the plow grooves and the curved surfaces on the side wall of the blind hole, enhancing the values of the electrode in the machining process.However, lateral electrodes developed by strip spring or triangle copper block are not very stable in the lateral discharge machining.This study develops two new lateral electrodes that can generate lateral discharge on the workpiece in EDM.One is an electrode that can transfer down motion to side deformation by four 45° inclined planes; the other electrode includes gear-and-rack-transmitted elements to obtain a discharge effect in lateral EDM.In the latter process, two rotating gears are utilized to deliver two horizontal racks, and then these racks push copper plates to have horizontal deformation, thereby inducing grooves and curve surface being machined during this stage.Moreover, copper plates will go back to the original position due to the recovering forces of the springs after EDM.As a result, lateral electrode with gear-and-rack-transmitted system performs better than that with inclined plane elements; moreover, tooth-shaped grooves and curve surfaces are easily to create in the tube because of stable feeding mechanism of this electrode.