Abstract: A chopping control process, for controlling a machine tool during chopping, i.e., shaping or cutting a workpiece, is allowed without adding an extra axis dedicated just to the chopping, i.e., a chopping dedicated axis. To correct a chopping operation (i.e., an operation of shaping or cutting a workpiece), for a movement error in the contour control (i.e., control of contour along which the workpiece is cut) with a positioning axis or rotation axis, an interpolation processing part 12 and an axis control processing part 13 are provided with a function of generating the movement data for performing the chopping operation by controlling two or more axes at the same time and a function of correcting the chopping operation.

Abstract: To provide a numerical control apparatus 1 provided with a plurality of skip signals (external signals), in which a processing program is easily fabricated even in the case where the tool is moved to the final specified position by decreasing stepwise, or increasing or decreasing stepwise the speed, every time a skip signal is input into the numerical control apparatus 1. The numerical control apparatus 1 comprises, in one block of a numerical control processing program, a skip command capable of issuing a plurality of optional feed speed commands for commanding an optional feed speed different from a feed speed by a normal feed command in the one block, the plurality of optional feed speed commands corresponding to a plurality of skip signals input from the outside, and an interpolation processing part 12 and an axis control processing part 13 for making the acceleration and deceleration control upon an input of the plurality of skip signals when the skip command is given.

Abstract: The chopping control process is allowed without adding the chopping dedicated axis. To correct the chopping operation for a movement error in the contour control with the positioning axis or rotation axis, an interpolation processing part 12 and an axis control processing part 13 are provided with a function of generating the movement data for making chopping operation by controlling two or more axes at the same time and a function of correcting the chopping operation.

Abstract: To provide a numerical control apparatus 1 provided with a plurality of skip signals (external signals), in which a processing program is easily fabricated even in the case where the tool is moved to the final specified position by decreasing stepwise, or increasing or decreasing stepwise the speed, every time a skip signal is input into the numerical control apparatus 1. The numerical control apparatus 1 comprises, in one block of a numerical control processing program, a skip command capable of issuing a plurality of optional feed speed commands for commanding an optional feed speed different from a feed speed by a normal feed command in the one block, the plurality of optional feed speed commands corresponding to a plurality of skip signals input from the outside, and an interpolation processing part 12 and an axis control processing part 13 for making the acceleration and deceleration control upon an input of the plurality of skip signals when the skip command is given.

Abstract: A fault diagnosis device searches for causes of fault of a device under test via a fault tree having a tree structure corresponding to the hardware organization of the device under test, where the nodes of the fault tree correspond to the units of the device under test. Some of the nodes including the root node have three or more child nodes. A test table associated with each node other than a leaf includes: a description of parameters to be detected by detector units; test conditions with respect to the parameters detected by the detector units; and fault probability table representing the fault probability values and the child node names corresponding to the respective patterns of results of the tests. The whole fault tree may be divided into a main fault tree stored in the main memory and fault branch trees stored in auxiliary memory. Then, the fault branch trees are loaded into the main memory when needed.