Abstract: There is provided a vibration suppression device, a machine tool including the device and a vibration suppression method using the device. The vibration suppression device includes a flexible member having a first position F fixed to the structure to be a fixed end of a cantilever and a second position on a free end side; and a weight attached to the flexible member in the second position. The vibration suppression device has an adjustment mechanism for changing a distance between the first position and the second position. Accordingly, it can effectively suppress vibration of a structure, and that can effectively suppress the vibration by easy adjustment when the characteristic of a generated vibration is different.

Abstract: A motion error of a machine tool in a coordinate system having its origin at an arbitrary position is identified by means of error data measured by a commonly-used method. An X-axis feed mechanism, a Y-axis feed mechanism, and a Z-axis feed mechanism are operated in a three-dimensional space of a machine coordinate system to measure translational errors, angular errors, and perpendicularity errors thereof, and error data for translational error parameters, angular error parameters, and perpendicularity error parameters in a three-dimensional space of a set coordinate system having its origin at a preset reference position Xa, Ya, Za are derived based on the measured actual error data. Subsequently, a relative motion error between a spindle and a table in the three-dimensional space of the set coordinate system is derived based on the derived error data.

Abstract: There is provided a vibration suppression device, a machine tool including the device and a vibration suppression method using the device. The vibration suppression device includes a flexible member having a first position F fixed to the structure to be a fixed end of a cantilever and a second position on a free end side; and a weight attached to the flexible member in the second position. The vibration suppression device has an adjustment mechanism for changing a distance between the first position and the second position. Accordingly, it can effectively suppress vibration of a structure, and that can effectively suppress the vibration by easy adjustment when the characteristic of a generated vibration is different.

Abstract: A motion error of a machine tool in a coordinate system having its origin at an arbitrary position is identified by means of error data measured by a commonly-used method. An X-axis feed mechanism, a Y-axis feed mechanism, and a Z-axis feed mechanism are operated in a three-dimensional space of a machine coordinate system to measure translational errors, angular errors, and perpendicularity errors thereof, and error data for translational error parameters, angular error parameters, and perpendicularity error parameters in a three-dimensional space of a set coordinate system having its origin at a preset reference position Xa, Ya, Za are derived based on the measured actual error data. Subsequently, a relative motion error between a spindle and a table in the three-dimensional space of the set coordinate system is derived based on the derived error data.

Abstract: Provided is a numerical control device capable of positioning a tool tip position in three-dimensional space with high accuracy. A numerical control device (1) includes a position compensator (5) and an error data storage (10). The error data storage (10) stores therein error data relating to angular errors (Eax, Eay, Eaz) around an X-axis, angular errors (Ebx, Eby, Ebz) around a Y-axis, and angular errors (Ecx, Ecy, Ecz) around a Z-axis in the X-, Y-, and Z-axes. The position compensator (5) calculates, based on commanded positions (Ix, Iy, Iz), the error data, and tool length data for a tool to be used, modification amounts (Mx, My, Mz) that vary in accordance with the tool length, modifies compensation amounts (Cx, Cy, Cz) for the commanded positions (Ix, Iy, Iz), and compensates for the commanded positions (Ix, Iy, Iz) with the modified compensation amounts.

Abstract: There is provided a method of compensating a command value for rotation angle capable of precisely compensating a command value for rotation angle even when conditions at detection differ to thereby make error patterns different in the case where a tooth-to-tooth period error pattern in an arbitrary tooth period is used for all the tooth periods to correct a command value for rotation angle. A forward direction tooth-to-tooth period error pattern being an error pattern of detected rotation angles at forward rotation and the actual rotation angles and a backward direction tooth-to-tooth period error pattern being an error pattern at backward rotation are found, and the command value for rotation angle is corrected based on the error pattern at the time of forward rotation, and the command value for rotation angle is corrected based on the error pattern at the time of backward rotation.

Abstract: There is provided a method of compensating a command value for rotation angle capable of precisely compensating a command value for rotation angle even when conditions at detection differ to thereby make error patterns different in the case where a tooth-to-tooth period error pattern in an arbitrary tooth period is used for all the tooth periods to correct a command value for rotation angle.

Abstract: A device is provided with a semiconductor gain medium (1) having an inclined or curved stripe structure, a Volume Bragg Grating element (3) constituting a resonator with the semiconductor gain medium (1), and a wavelength conversion element (5) which outputs a harmonic wave (H) of a fundamental wave (A) from the resonator. Preferably, the semiconductor gain medium (1) is a frequency incoherent and broadband semiconductor gain medium, the wavelength conversion element (5) is a periodic polarization type nonlinear wavelength conversion element, and the Volume Bragg Grating element (3) and the periodic polarization type nonlinear wavelength conversion element (5) have a grating period having a chirped structure.