Control device, machining system, and recording medium encoded with program

A recording medium encoded with a program that causes a computer to function as a control device configured to control operation of a drive unit and monitor a rotational balance of a rotating body, for a machine tool including the rotating body that is rotatable around c predetermined axial center in a state of fixing an object and on which an adjusting tool that can adjust the rotational balance is arrangeable, and the drive unit that rotates the rotating body,

• the program causing the computer to function as:
• a physical quantity acquiring unit configured to acquire at least one physical quantity indicating a rotational state of the rotating body, the physical quantity being changed in response to an adjustment of the rotational balance;
• a determining unit configured to compare a plurality of physical quantities having different acquisition times, and determine a change in a physical quantity;
• and
• an output unit configured to output a determination result.