Device and method for controlling machine tool

A device for controlling a feed motion of a feed control axis and a rotary motion of a rotary control axis, said feed control axis and said rotary control axis being provided in a machine tool so that said rotary control axis is fed along said feed control axis, comprising:

• an interference estimating section estimating an interference generated between said feed control axis and said rotary control axis, based on a position command instructed to at least one of said feed control axis and said rotary control axis and a position and mass information of an eccentric load carried by said rotary control axis, by calculating a force exerted on said rotary control axis due to a thrust applied to said eccentric load during the feed motion of said feed control axis, or by calculating a force exerted on said feed control axis due to a centripetal force and a tangential force applied to said eccentric load during the rotary motion of said rotary control axis;
• and
• a command correcting section correcting a current command given to at least one of said feed control axis and said rotary control axis, based on said interference estimated by said interference estimating section.