Display device for machine tool

A display device for a machine tool that performs oscillation machining while relatively oscillating a cutting tool and a workpiece by superimposing, on a constant feed, an oscillation command for sine curve-shaped oscillation or an oscillation command for triangular wave-shaped oscillation in which a minimum feed speed and a maximum feed speed included in a speed that changes are the same, the display device comprising:

• a machining condition acquisition unit that acquires at least a frequency parameter and an amplitude parameter as machining conditions for performing the oscillation machining;
• a speed calculation unit that calculates a maximum absolute value speed that is a maximum included in an absolute value of a speed that changes and pertains to the oscillation command, based on at least the frequency parameter and the amplitude parameter;
• and
• a display control unit that displays, on a display unit, an image based on the maximum absolute value speed.