| 摘要 |
A method and apparatus for determining the amount of deflection, or curvature height, of an electrode wire during machining of a workpiece by the electrode wire in a travelling wire EDM apparatus. A parametr affecting the curvature height of the electrode wire is varied from a first value to a second value and the resulting variation DELTA f of the curvature height is measured. The measuring is effected by determining the difference between the length of the path travelled by the wire guide members and the length of the path travelled by the active portion of the wire. The ratio between the curvature height of the wire and the inverse of the relative variation of the parameter is subsequently determined. Preferably, a parameter independent of the machining speed is selected, such as the force of longitudinal traction exerted on the wire or the distance separating the two wire guide members.
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