Machine tool, method of estimating force applied to tool, and non-transitory computer-readable medium storing program for estimating force applied to tool

A method of estimating a force applied to a tool when cutting a workpiece in a machine tool,

• the machine tool including
• a first surface that receives a force due to the cutting of the workpiece, the first surface being located in the machine tool,
• a second surface that receives a force due to the cutting of the workpiece, the second surface being located in the machine tool, the second surface being not parallel to the first surface, and
• a strain sensor coupled to the first surface and the second surface, wherein the strain sensor has a first end in direct contact with the first surface and a second end in direction contact with the second surface, the strain sensor has a shape not in direct contact with a connection portion constituted of the first surface and the second surface due to a gap located between an inner side surface of the first strain sensor and the connection portion, the method comprising
• obtaining an output value of the strain sensor during the cutting of the workpiece;
• and
• estimating a force applied to the tool, based on the output value.

A non-transitory computer-readable medium storing a program for estimating a force applied to a tool when cutting a workpiece in a machine tool,

• the machine tool including
• a first surface that receives a force due to the cutting of the workpiece, the first surface being located in the machine tool,
• a second surface that receives a force due to the cutting of the workpiece, the second surface being located in the machine tool, the second surface being not parallel to the first surface, and
• a strain sensor coupled to the first surface and the second surface, wherein the strain sensor has a first end in direct contact with the first surface and a second end in direction contact with the second surface, the strain sensor has a shape not in direct contact with a connection portion constituted of the first surface and the second surface due to a gap located between an inner side surface of the first strain sensor and the connection portion, the program causing
• the machine tool to perform:
• obtaining an output value of the strain sensor during the cutting of the workpiece;
• and
• estimating a force applied to the tool, based on the output value.