sinker edm machine with a device to compensate for the elektrodenverschleisses and procedures to compensate for the elektrodenverschleisses.

摘要

The erosion electrode is brought into engagement with the workpiece. A mechanical biassing arrangement (4) to bias the electrode (5) is provided with an automatic adjustment arrangement including a second biassing arrangement (6) which compensates for the wear of the electrode in use. Adjustment is effected by periodically removing the second biassing arrangement and moving the electrode into engagement with, or a predetermined distance (ZA) from, a reference plane (8) using the first bias, and then removing the first bias and applying the second bias so that the electrode is controlled by the second biassing arrangement. Electric sensors may be used to effect the adjustment and determine when the electrode end has reached the desired reference position. The sensors may monitor the electrical resistance between the electrode and the reference plane which exists when a test voltage is applied. A number of electrodes may be provided, each having its own pair of biassing arrangements.