Speed adjustment device

A speed adjustment device for adjusting a speed of a driving axis of a machine tool that performs a drilling process on a workpiece using a tool, the speed adjustment device comprising:

• a processor configured to:
• store a calculation method for an adjusted speed of the driving axis in a speed-adjusted section, the adjusted speed being determined in accordance with a tool being used, a shape of the workpiece in the speed-adjusted section, and path information;
• identify the speed-adjusted section and the shape of the workpiece in the speed-adjusted section on the basis of shape data of the workpiece and the path information;
• and
• determine the calculation method for the adjusted speed of the driving axis in the speed-adjusted section on the basis of tool data, the shape of the workpiece in the speed-adjusted section identified, the path information, and stored information, and calculate the adjusted speed in the speed-adjusted section on the basis of the determined calculation method,
• wherein the speed adjustment device identifies, as the shape of the workpiece in the speed-adjusted section, a machining path of a drilling cycle obtained from a machining program and a shape of a surface of the workpiece including an intersection with the machining path.