A method for checking positioning accuracy of a CNC machine with a machine tool head and a machine table using an x, y, z coordinate system, the method comprising: a) arranging a plurality of vessels on the table, the vessels in fluid connection with each other to form a system of vessels, the vessels filled with a liquid, b) mounting a distance sensor to the tool head, c) positioning the tool head to a position above the surface of the liquid in one of the vessels, d) a determining the z coordinate for which the distance sensor touches the surface of the liquid, or, for a predetermined position of the tool head in z direction above the liquid, determining the distance between the distance sensor and the liquid; steps c) and d) are repeated for each vessel to determine a z coordinate of the surface of the liquid.

A numerical controller includes: a program analyzing unit to obtain an end point position of a tool; a first angle calculating unit to calculate an inclination angle of a synthetic feeding direction that maximizes a synthetic torque, based on an upper limit movement torque of the tool in each of the two axis directions; a second angle calculating unit to calculate an inclination angle of a cutting feed direction of the tool based on a start point position and the end point position of the tool; a rotation angle calculating unit to calculate a difference between the inclination angle of the synthetic feeding direction and the inclination angle of the cutting feed direction as a rotation angle of a table; and a servo motor control unit to control rotation of the table based on the rotation angle.

A numerical controller includes: a program analyzing unit to obtain a first movement end point position of the tool; a direction calculating unit to calculate a synthetic movement direction that maximizes a synthetic velocity, based on an upper limit movement velocity of the tool in each of the two axis directions; an end point position calculating unit to calculate an intersection position of a circle and the synthetic movement direction as a second movement end point position, wherein the circle has as a radius a distance from a rotation center position of the table to the first movement end point position; a rotation angle calculating unit to calculate a rotation angle of the table based on the first movement end point position and the second movement end point position; and a rotation control unit to control rotation of the table based on the rotation angle.

A machine tool includes one tip arranged on the spindle at a position that faces the table, a cutting edge position storing unit that stores therein multiple measured values that are obtained by performing measurement of the position of the tip at least two times in a state where the spindle is set at at least one phase and the tip is positioned at an identical point, a spindle tilt angle calculating unit that calculates a tilt angle of the spindle with respect to an XY-plane, based on the multiple measured values, and a coordinate system rotation unit that rotates the XY-plane about at least one of X-axis and Y-axis, based on the tilt angle of the spindle calculated by the spindle tilt angle calculating unit.

A printing correction method and a 3D printing device are provided, and the printing correction method is adapted to the 3D printing device having a printing platform. The printing correction method is as follows. An electric field is provided to the printing platform. A detection probe is extended towards a position of the printing platform along a first axial direction to enter the electric field, where the position is defined as an initial position. The detection probe is moved from the initial position along a moving path on the printing platform, and when the detection probe is moved along the moving path, an electric field variation is detected to determine a tilt variation of the printing platform relative to the first axial direction. It is determined whether to correct the printing platform according to the tilt variation of the printing platform.

The object of the present invention is a device for moving a load and for the control thereof, particularly for regulating the positioning and/or orientation of a first plane, for example that is integral with an automatic machine, with respect to a reference plane or direction, for example that of the force of gravity. More specifically, the present invention consists of a device that makes it possible to move at least a number of points of the lower portion of an automatic machine and/or of the surface of an object along at least one axis (C), so as to regulate the orientation and/or inclination of the machine and/or object with respect to a reference direction.

A machine tool includes one tip arranged on the spindle at a position that faces the table, a cutting edge position storing unit that stores therein multiple measured values that are obtained by performing measurement of the position of the tip at least two times in a state where the spindle is set at at least one phase and the tip is positioned at an identical point, a spindle tilt angle calculating unit that calculates a tilt angle of the spindle with respect to an XY-plane, based on the multiple measured values, and a coordinate system rotation unit that rotates the XY-plane about at least one of X-axis and Y-axis, based on the tilt angle of the spindle calculated by the spindle tilt angle calculating unit.

A numerical controller includes: a program analyzing unit to obtain an end point position of a tool; a first angle calculating unit to calculate an inclination angle of a synthetic feeding direction that maximizes a synthetic torque, based on an upper limit movement torque of the tool in each of the two axis directions; a second angle calculating unit to calculate an inclination angle of a cutting feed direction of the tool based on a start point position and the end point position of the tool; a rotation angle calculating unit to calculate a difference between the inclination angle of the synthetic feeding direction and the inclination angle of the cutting feed direction as a rotation angle of a table; and a servo motor control unit to control rotation of the table based on the rotation angle.

A numerical controller includes: a program analyzing unit to obtain a first movement end point position of the tool; a direction calculating unit to calculate a synthetic movement direction that maximizes a synthetic velocity, based on an upper limit movement velocity of the tool in each of the two axis directions; an end point position calculating unit to calculate an intersection position of a circle and the synthetic movement direction as a second movement end point position, wherein the circle has as a radius a distance from a rotation center position of the table to the first movement end point position; a rotation angle calculating unit to calculate a rotation angle of the table based on the first movement end point position and the second movement end point position; and a rotation control unit to control rotation of the table based on the rotation angle.

The object of the present invention is a device (1) for moving a load and for the control thereof, particularly for regulating the positioning and/or orientation of a first plane, for example that is integral with an automatic machine, with respect to a reference plane or a direction, for example that of the force of gravity. More specifically, the present invention consists of a device that makes it possible to move at least a number of points of the lower portion of an automatic machine and/or of the surface of an object along at least one axis (C), so as to regulate the orientation and/or inclination of the machine and/or object with respect to a reference direction.