Importance

Loading Importance Indicators...

Abstract

Electrical discharge machining apparatus in which a plurality of generally parallel electrodes are moved during machining and during refeed in generally parallel paths. A drive roller assembly is provided for refeeding the electrodes after each machining cycle to compensate for erosion of the electrodes that occurred during the preceding machining cycle. The drive roller assembly consists of a plurality of rollers arranged on opposite sides of the electrodes so that the electrodes are drivingly engaged between the rollers. The apparatus is further equipped with a movable gage member having an electrode engaging surface. After each machining cycle, the gage member is moved to a predetermined position between the location of the workpiece and the electrodes. The electrodes are refed into engagement with the electrode engaging surface which defines a reference surface between the workpiece and the electrodes. Refeed of the electrodes is terminated when the electrodes engage the gage member. After refeed is completed, the gage member is retracted and the machining cycle is initiated.

Loading the Abstract Image...

First Claim