A command analysis unit in a numerical controller analyzes a fixed cycle command in a processing program and outputs the analysis result to a fixed cycle calculation unit. The unit generates a command data sequence including a plurality of command data based on the analysis result. The unit includes a surplus calculation unit calculating a surplus cutting depth based on an overall cutting depth and a cutting depth in each cut, the respective cutting depths being specified by the fixed cycle command and being applied to a workpiece by a tapping tool, and a command data sequence adjustment unit that adjusting the order or the cutting depth of the command data in the command data sequence based on the surplus cutting depth to reduce a total feed movement amount by which the tapping tool moves in accordance with the command data sequence.

Provided is a screw length determination system capable of determining the length of a screw with a high degree of accuracy. A PLC (10) determines the length of a screw on the basis of the amount of rotation or the position in the axial direction of a driver during a period lasting from the time when the screw completes its descent until any time from among the time when provisional seating occurs, the time when the primary tightening period ends and the time when the period of holding for primary tightening ends.

A screw length determination system capable of quickly determining the length of a screw is obtained. A PLC (10) is equipped with a determination part for measuring the moving speed of a driver for tightening screws in the axial direction of the driver from an initial position until a screw contacts and is screwed into a workpiece, and determining the length of the screw on the basis of the time from the start of movement from the initial position until the moving speed changes.

Provided is a screw length determination system capable of determining the length of a screw with a high degree of accuracy. A PLC (10) determines the length of a screw on the basis of the amount of rotation or the position in the axial direction of a driver during a period lasting from the time when the screw completes its descent until any time from among the time when provisional seating occurs, the time when the primary tightening period ends and the time when the period of holding for primary tightening ends.

A driver device comprises a housing and a driving-bit socket in the housing. The driver device may comprise a first guide-leg track on the housing. A first guide leg may be inserted into the first guide leg track. The driver device may also comprise a first guide-leg foot at an end of the first guide leg. The first guide-leg foot may be configured to interface with a surface of the driving recipient. The first guide leg may retract into the first guide-leg track as the driver device drives a driving object into the driving recipient.

Provided is a technique capable of suitably determining screw fastening failure. A screw fastening failure determination device (10) includes: a speed acquisition unit (13) which acquires an axial speed of a screw driver or a speed feature value relating to the speed; and a failure determination unit (14) which determines, in a temporary seating process, that a screw fastening has failed on the basis of the axial speed or the speed feature value at a prescribed timing.

The disclosure provides a method, device and equipment for monitoring screwing. The method for monitoring screwing comprises: obtaining an air pressure value in an air supply line; the air supply line being used to supply air to a pneumatic screwdriver to trigger the pneumatic screwdriver to perform a screwing operation; determining a target monitoring value according to the air pressure value; wherein the target monitoring value comprises at least one of: an initial air pressure value when the pneumatic screwdriver starts performing the screwing operation; a lower air pressure limit value when the pneumatic screwdriver performs the screwing operation; a working time of the pneumatic screwdriver for performing the screwing operation; judging whether the target monitoring value conforms to a corresponding predetermined range value and obtaining a judgment result; determining, based on the judgment result, whether the pneumatic screwdriver performs the screwing operation properly.

A driver device comprises a housing and a driving-bit socket in the housing. The driver device may comprise a first guide-leg track on the housing. A first guide leg may be inserted into the first guide leg track. The driver device may also comprise a first guide-leg foot at an end of the first guide leg. The first guide-leg foot may be configured to interface with a surface of the driving recipient. The first guide leg may retract into the first guide-leg track as the driver device drives a driving object into the driving recipient.

A method for controlling a level of quality of screwdriving by a screwdriver relative to a predetermined screwdriving objective. Such a method takes account of a series of data that are representative of the rise in torque of at least two screwdrivings of screws at a predetermined angular frequency and includes: obtaining a sub-series of data for each of the screwdriving operations, corresponding to a sub-series of measurements delivering the sub-series of data; optimized aggregation of the sub-series, to form the series of data, including eliminating data corresponding to a number of measurements that is determined according to a criterion of optimization of periodicity; and analyzing the series of data, delivering information representative of a dispersion and/or a deviation relative to the screwdriving objective, resulting from disturbances induced by the screwdriver.

Methods and devices are provided for detecting connecting elements, in particular friction drilling screws, in mechanical joining and forming processes in which an error event in the process was identified. The method includes moving a carrier component for the connecting element toward a workpiece to determine a contact point of the connecting element on the workpiece. This feeding step is carried out as a next method step after the error event is detected and ascertains whether the contact point is detected within a predefined permissible tolerance in order to determine whether the connecting element is still located in a feed head.