Estimating device and estimating system

An estimating device for estimating a position of a rotary axis in relation to a machine tool equipped with a tool, the machine tool being configured to perform a lathe turning process, by using the tool, on a workpiece that rotates about the rotary axis;

• the machine tool comprising:
• a first motor configured to cause the tool to move relatively with respect to the workpiece along a first direction perpendicular to the rotary axis;
• and
• a second motor configured to cause the tool to move relatively with respect to the workpiece along a second direction perpendicular to the rotary axis and the first direction,
• the estimating device comprising:
• a first position acquisition unit configured to acquire a position of the tool in the first direction;
• a second position acquisition unit configured to acquire a position of the tool in the second direction;
• a load acquisition unit configured to acquire a first directional load of the tool in the first direction, and a second directional load of the tool in the second direction;
• a determination unit configured to determine whether or not the first directional load and the second directional load are less than or equal to a predetermined threshold value;
• a turning control unit configured to, by controlling the first motor based on a first command, perform a lathe turning process on the workpiece until the first directional load becomes less than or equal to the threshold value, and thereafter, by controlling the second motor based on a second command, perform a lathe turning process on the workpiece until the second directional load becomes less than or equal to the threshold value;
• and
• an estimating unit configured to select, as a first directional position, a position of the tool in the first direction at a time when the first directional load has become less than or equal to the threshold value, select, as a second directional position, a position of the tool in the second direction at a time when the second directional load has become less than or equal to the threshold value, and estimate a position of the rotary axis on a plane defined by the first direction and the second direction, based on the selected first directional position and the selected second directional position.