Wire electric discharge machine including control means for holding wire electrode at desired angle

A wire electric discharge machine including a reel which is supported by a column and around which a wire electrode is wound, and an upper wire guide and a lower wire guide which support the wire electrode that is drawn out from the reel, and carrying out electric discharge machining of a workpiece fixed on a table by relatively moving the wire electrode extended between the upper wire guide and the lower wire guide with respect to the workpiece according to a command of a machining program, the wire electric discharge machine comprising:

• a wire electrode slanting amount storage device configured to store a relationship between a weight of the reel and a slanting amount of the extended wire electrode;
• a compensation amount calculating device configured to determine a compensation amount for the slanting of the wire electrode based on
• a weight of the reel during electric discharge machining including a remaining length of the wire electrode remaining on the reel, and
• the relationship between the weight of the reel and the slanting amount of the extended wire electrode, said relationship stored in the wire electrode slanting amount storage device;
• and
• a controller configured to relatively move the wire electrode with respect to the workpiece so as to compensate the slanting of the wire electrode by the compensation amount-determined by the compensation amount calculating device.