In a machine tool, when machining is in a steady zone, a rotation phase of a main spindle at the time of measurement in the N-th sampling is calculated, and the calculated rotation phase and the measurement value are recorded in a recording section so as to be associated with each other. The measurement and calculation of the rotation phase of the main spindle at the time of each measurement are continued for plural times of rotations of the main spindle, and thus the measurement values are obtained at various rotation phases, whereby change in drive force during one rotation of the main spindle is finally calculated.

In a machine tool, when machining is in a steady zone, a rotation phase of a main spindle at the time of measurement in the N-th sampling is calculated, and the calculated rotation phase and the measurement value are recorded in a recording section so as to be associated with each other. The measurement and calculation of the rotation phase of the main spindle at the time of each measurement are continued for plural times of rotations of the main spindle, and thus the measurement values are obtained at various rotation phases, whereby change in drive force during one rotation of the main spindle is finally calculated.

A drilling device with automatic or controlled feed speed. The drilling device includes a casing that houses a drilling spindle that is to drive a cutting tool in motion to drill a workpiece having a target surface. The spindle is tiltable inside the casing relative to the axis of the casing. The device has a self-alignment, which self-aligns the spindle relative to the target surface. The self-alignment moves the spindle into a position in which its axis is essentially perpendicular to the target surface under the effect of an application of a thrust force of the drilling device against the target surface essentially along the axis of the casing.

A turning controller includes a storage, a working program processing device, a command value setting processing device, an approach angle setting command amount calculator, and a command processing device. The storage is configured to store a working program and tool shape data. The working program processing device is configured to analyze the working program and to calculate and output command amounts. The command value setting processing device is configured to set an approach angle command value for defining an approach angle. The approach angle setting command amount calculator is configured to calculate, as an approach angle setting command amount, a B-axis command amount for controlling to cause the approach angle to have the approach angle command value based on the tool shape data. The command processing device is configured to output the approach angle setting command amount to the B-axis driver.

A turning controller includes a storage, a working program processing device, a command value setting processing device, an approach angle setting command amount calculator, and a command processing device. The storage is configured to store a working program and tool shape data. The working program processing device is configured to analyze the working program and to calculate and output command amounts. The command value setting processing device is configured to set an approach angle command value for defining an approach angle. The approach angle setting command amount calculator is configured to calculate, as an approach angle setting command amount, a B-axis command amount for controlling to cause the approach angle to have the approach angle command value based on the tool shape data. The command processing device is configured to output the approach angle setting command amount to the B-axis driver.

An automated mechanical machining system for machining a metal panel having a first face and a second face. The automated mechanical machining system further including at least one machining tool, at least one holding tool, a control module configured to control the at least one machining tool and the holding tool in a coordinated manner, a matching module configured to determine simple actual machining paths TRAJr1 from, on the one hand, predetermined simple theoretical machining paths TRAJt1 and, on the other hand, measurement of the actual surface SURFr of the second face and a slope management module configured to determine sloping actual machining paths TRAJr2 from sloping theoretical machining paths TRAJt2, the simple theoretical machining paths TRAJt1 and the simple actual machining paths TRAJr1.

An automated mechanical machining system for machining a metal panel having a first face and a second face. The automated mechanical machining system further including at least one machining tool, at least one holding tool, a control module configured to control the at least one machining tool and the holding tool in a coordinated manner, a matching module configured to determine simple actual machining paths TRAJr1 from, on the one hand, predetermined simple theoretical machining paths TRAJt1 and, on the other hand, measurement of the actual surface SURFr of the second face and a slope management module configured to determine sloping actual machining paths TRAJr2 from sloping theoretical machining paths TRAJt2, the simple theoretical machining paths TRAJt1 and the simple actual machining paths TRAJr1.

A method to ascertain a quality of a product formed by a subtractive manufacturing device from a workpiece includes: determining a deflection/test force relation for a deflection of the device; measuring an actually exerted machining force applied by the device to the workpiece; automatically determining a machining force reference for the actually exerted machining force; automatically evaluating whether the actually exerted machining force deviates from the machining force reference. If an actually exerted machining force deviates from the machining force reference, then the method uses the deflection/test force relation to automatically determine for the actually exerted machining force, at least one correction deflection of the device and automatically creating at least one corrected drive control signal to fully or partially reduce the correction deflection.

A method to ascertain a quality of a product formed by a subtractive manufacturing device from a workpiece includes: determining a deflection/test force relation for a deflection of the device; measuring an actually exerted machining force applied by the device to the workpiece; automatically determining a machining force reference for the actually exerted machining force; automatically evaluating whether the actually exerted machining force deviates from the machining force reference. If an actually exerted machining force deviates from the machining force reference, then the method uses the deflection/test force relation to automatically determine for the actually exerted machining force, at least one correction deflection of the device and automatically creating at least one corrected drive control signal to fully or partially reduce the correction deflection.

The present invention addresses the problem of avoiding uncut portions of a workpiece and interference between a workpiece and a tool attributed to an incorrect movement direction or movement amount of the rotational axis, without changing a program. The numerical control device according to the present invention is a numerical control device for a machine tool that implements machining while changing the relative position and relative orientation between a tool and a workpiece on the basis of a program, the numerical control device comprising: a contour shape generation unit that generates contour shape information pertaining to the contour shape of the workpiece on the basis of relative movement information between the tool and the workpiece described in the program; a relative orientation determination unit that determines a relative orientation of the tool in relation to the workpiece at a change point included in the contour shape information; and a relative orientation change direction determination unit that determines, according to the type of the contour shape, a change direction for the relative orientation in order to obtain the determined relative orientation.