A method for drilling an element to be drilled by a drilling device and a cutting tool including drill margins and cutting edges. The method includes determining at least one load value representing overall drag due to internal friction of the drilling device and to friction of drill margins in the element to be drilled. Determining includes: stopping a drilling operation in progress; partial retraction of the cutting tool on a predetermined distance, the predetermined distance being chosen such that the cutting edges are no longer in contact with the element to be drilled; driving the cutting tool with predetermined cutting parameters; measuring at least one load value during the driving of the cutting tool with the cutting parameters before its cutting edges again come into contact with the element to be drilled and after stabilization of the load values, the measured load value representing the overall drag.

A spindle nose for a machine tool spindle. The spindle nose has a longitudinal axis and a receiving end at which a conical receiving area opens. The receiving area tapers conically away from the receiving end in the direction of the longitudinal axis for receiving a tool shaft cone. A circumferential wall surrounds the receiving area and forms a circumferential contact edge. The contact edge has flat contact surfaces on which contact surfaces of the tool shaft cone rest when the tool is clamped in the tool spindle. The spindle nose defines blind receiving bores leading perpendicularly to the flat contact surfaces and which end below the flat contact surfaces. The contact edge is divided into at least four segments with the same angle. At least one receiving bore is formed in each of the segments. A sensor is arranged in each receiving bore.

A measuring system monitors a spindle. The measuring system includes a cylindrical housing which can be arranged in and mechanically firmly connected to a spindle housing. A carrier ring is arranged inside the cylindrical housing. Three sensors for measuring a radial displacement and three sensors for measuring an axial displacement of the spindle are distributed over a circumference of the carrier ring. The sensors are cast with the carrier ring.

A tool driving device for hole processing includes a spindle, an electric motor, a guide, an electric actuator, a sensor and a controller. The spindle has a holder for holding a tool for the hole processing. The holder is disposed at a distal portion of the spindle. The electric motor rotates the spindle. The guide has a positioning member for positioning the tool driving device to the workpiece. The electric actuator advances and retreats the spindle relatively to the guide in a rotation axis direction of the spindle. The sensor measures cutting resistance transmitted from the tool to the spindle. The controller is configured to control the electric motor and the electric actuator based on the cutting resistance measured by the sensor so that a rotating speed and a feeding speed of the spindle become a rotating speed and a feeding speed according to the cutting resistance.

A system and method for monitoring and predicting wear of a cutting tool used for machining a workpiece is disclosed. The system includes a cutting tool having a shank and a cutting head. The system also includes a split, modular and wireless wear detection system including one or more sensors mounted to the cutting tool for providing a data signal representative of a physical condition of the system, and a data recording and data transmitting device for recording the data signal from the one or more sensors and for generating and transmitting a data signal to a processor. The processor applies a machine learning data processing technique in real time to monitor and/or predict a condition of various components and/or parameters of the system during a metal cutting operation.

There is provided a technique to estimate a cutting force by a new method other than use of a dynamometer. A machine tool capable of cutting a workpiece using a tool includes a first surface that receives a force due to the cutting of the workpiece, the first surface being located in the machine tool; and a second surface that receives a force due to the cutting of the workpiece, the second surface being located in the machine tool. The second surface is not parallel to the first surface, and the machine tool includes: a first strain sensor coupled to the first surface and the second surface; and an estimation unit that estimates a force applied to the tool, based on an output value of the first strain sensor during the cutting of the workpiece.

A processing system includes a cutting tool, a sensor attached to the cutting tool, an analog-to-digital (AD) converter configured to perform sampling on an analog signal output from the sensor to generate a digital signal, and a processing unit. The processing unit is configured to, based on a rotation rate [rpm] of a rotor; an upper-limit period that is an upper-limit value of a process period; and an upper-limit pitch that is an upper-limit value of an angle pitch [degree], determine the process period and a sampling frequency with which the AD converter performs sampling such that a set value of the angle pitch is equal to the upper-limit pitch or less in a time period taken by the rotor to rotate N times with the process period that is equal to the upper-limit period or shorter.

A positioning apparatus for positioning a tactile or optical roughness sensor, a probe or some other measuring instrument with respect to a workpiece can be secured to a movement device of a coordinate measuring machine. The positioning apparatus has a drive that produces a relative movement between two parts of the positioning apparatus, and an inhibiting device, which inhibits the relative movement between the two parts. For this purpose, the inhibiting device has a first friction element and a second friction element each having unlubricated friction surfaces. The friction surfaces are pressed against one another with a normal force that is not variable during the operation of the positioning apparatus. A coefficient of sliding friction that is less than 0.15 acts between the friction surfaces in the case of dryness and without lubrication. Typically, the inhibiting device is arranged in a flexspline of a strain wave gearing.

A tool post of a machine tool, in which the tool post is capable of receiving a cutting insert for machining a component, is provided. The tool post includes at least one sensor capable of determining a parameter representative of a cutting action between a component to be machined and a cutting insert; and a support housing which is electrically connected to the sensor and includes a battery and a printed circuit board supplied with current by the battery. The printed circuit board supports, at least partially, a radio transmission unit. The housing includes a base and a cover which can be detached from one another. The battery is supported by the cover and the printed circuit board by the base or vice versa.

Provided is a sensing system for wireless and passive monitoring of strain during a manufacturing process that depends on force to apply the energy into the manufacturing process, the sensing system comprising: at least one surface acoustic wave (SAW) sensor for detecting strain, the at least one SAW sensor being positioned in a force path located on or in the structure of one or more objects under test; and at least one transceiving antenna arrangement being connectable to the at least one SAW sensor, wherein the at least one SAW sensor and the at least one transceiving antenna arrangement are arranged to receive energy from an interrogation signal and output a strain response signal detected by the at least one SAW sensor in response to the interrogation signal.