Method for operating a machine tool, and machine tool

Abstract

The invention relates to a method for operating a machine tool (10). The machine tool is first operated using a first combination of operating parameters so that a first work progress is obtained. During the operation of the machine tool using the first combination of operating parameters, the first work progress can be ascertained and compared with a second work progress, which is obtained when the machine tool is operated using a second combination of operating parameters. According to the result of the comparison, the machine tool can be further operated using the second combination of operating parameters or the machine tool can be returned to the operation using the first combination of operating parameters. The comparison of the work progress can be repeated until a maximum work progress, i.e. an optimal work progress, has been reached or found. Another aspect of the invention relates to a machine tool, said machine tool preferably being designed as a drilling tool, preferably as a core-drilling tool.

Description

[0001] METHOD FOR OPERATING A MACHINE TOOL AND MACHINE TOOL

[0002] The present invention relates to a method for operating a machine tool, wherein the machine tool is initially operated with a first combination of operating parameters so that a first work progress is obtained. During operation of the machine tool with a first combination of operating parameters, this first work progress can be determined and compared with a second work progress which is obtained when the machine tool is operated with a second combination of operating parameters. Depending on the result of the comparison, the machine tool can continue to be operated with the second combination of operating parameters or the machine tool can return to operation with the first combination of operating parameters. This comparison of the work progresses can be repeated until a maximum, i.e. optimal work progress is reached or found.In a further aspect, the invention relates to a machine tool, wherein the machine tool is preferably designed as a drilling device, preferably as a core drilling device. The machine tool can be connected to an accessory device, such as a feed device, wherein the accessory device is configured to determine the work progress of the machine tool.

[0003] Background of the invention:

[0004] Machine tools are known in the prior art with which work can be carried out, for example on a construction site or in the DIY sector. Machine tools can be, but are not limited to, cutting or separating devices, angle or cut-off grinders, core drilling machines, hammer drills or drill bits. The machine tools typically comprise tools which can be disc-shaped, rotating tools, such as cutting or grinding discs, or percussive or chiseling tools. In addition, machine tools are known in the prior art with which essentially cylindrical drill cores can be cut out of a subsurface. These machine tools can be drilling machines or core drilling machines. Core drilling machines, for example, have drill bits as tools which can be driven by the core drilling machine to perform a rotary movement.The tools of machine tools known from the prior art are usually driven by an electric motor inside the machine tool. The motor rotates, and the rotation of the motor is converted into a rotation of the tool or a percussive or chiseling movement of the tool. Additionally, machine tools can be equipped with a gearbox so that the machine tool can be operated in different gears. Many machine tools can be operated with different tools. For example, different grinding wheels can be attached to a grinder to perform different tasks or requirements. Core drilling machines, for example, can be operated with core bits of different diameters to create holes of different sizes.The tools on machine tools can differ in terms of their fineness, size, diameter, or many other properties. Currently, the state of the art is that machine tools are mostly operated with one or more standard parameter sets for speed and torque. Switching from one parameter set to another is usually done manually by the user. The user acts as the connecting link by setting different parameter sets for each application. This can lead to a situation in which the work to be performed cannot be carried out optimally in certain applications because the working parameters, such as speed or torque, are not optimally matched to the tool being used, the machine tools in question, the tool being used, or the specific application.

[0005] The object underlying the present invention is to overcome the above-described disadvantages of the prior art and to provide a method for operating a machine tool in which working parameters, such as speed and torque, can be better adapted to different tools, surfaces to be machined, or applications. Furthermore, a machine tool is to be provided with which the proposed method can be implemented. A particular aim of the invention is to provide improved adaptation of the operating behavior of the machine tool for different applications.

[0006] The problem is solved by the subject matter of the independent claims. Advantageous embodiments of the subject matter of the independent claims can be found in the dependent claims.

[0007] Description of the invention: According to the invention, a method for operating a machine tool is provided. The method is characterized by the following method steps: a) operating the machine tool with a first combination of operating parameters, wherein the first combination of operating parameters comprises a first speed n1 and a first torque M1, b) determining a first work progress AF1 of the machine tool when operating with the first combination of operating parameters, c) setting a second combination of operating parameters, wherein the second combination of operating parameters comprises a second speed n2 and a second torque M2, d) determining a second work progress AF2 of the machine tool when operating with the second combination of operating parameters, e) comparing the first work progress AF1 with the second work progress AF2, wherein

[0008] - Continuation of the operation of the machine tool with the first combination of operating parameters if the first work progress AF1 is greater than the second work progress AF2, and

[0009] - Continuation of the operation of the machine tool with the second combination of operating parameters if the first work progress AF1 is smaller than the second work progress AF2.

[0010] The invention can provide an operating method and a machine tool with which the user can be supported when working with the machine tool and which can reduce the number of settings to be made by the user. Tests have shown that working with the machine tool can be made significantly easier for the user and, at the same time, the use of the machine tool can be improved. This is particularly due to the fact that the operation of the machine tool can be optimally adapted to the tool of the machine tool and / or a surface to be machined. Within the meaning of the invention, it is preferred that the machine tool is a device with electronic gears, wherein the device can in particular be designed as a core drilling device. The machine tool can preferably be connected to a power supply device in order to ensure a power supply to the machine tool.The energy supply device can preferably be a rechargeable battery or an accumulator. If the machine tool returns to operation with the first parameter set after operation with the second parameter set because the first work progress AF1 is greater than the second work progress AF2, the method can then be continued in that - for example after a short period of time - the second parameter set is set again and the comparison of the work progresses is repeated. If at this later point in time the second work progress AF2 is greater than the first work progress AF1, the operation of the machine tool can then be continued with the second parameter set, i.e., with the second combination of operating parameters.

[0011] If the machine tool continues to operate with the second parameter set after operation because the first work progress AF1 is less than the second work progress AF2, the process can then be continued by setting a third parameter set, for example after a short period of time. The work progress achieved with this third parameter set ("third work progress AF3") can then be compared with the second work progress. If the second work progress is greater than the third work progress, the machine tool preferably returns to operation with the second parameter set. If the second work progress is less than the third work progress, the machine tool continues to operate with the third parameter set.The setting of the third parameter set is preferably also referred to in the sense of the invention as “setting a third combination of operating parameters”, wherein the third combination of operating parameters comprises at least a third rotational speed n3 and a third torque M3.

[0012] According to the invention, it is preferred that the operation of the machine tool be continued with the second combination of operating parameters if the first work progress AF1 is similar to the second work progress AF2. In other words, work with the machine tool can be continued with the second or current parameter set if the work progresses are within a similar range.

[0013] The combinations of operating parameters preferably comprise at least a speed n and a torque M. In addition to these two operating parameters, an operating parameter combination can also comprise further, additional operating parameters. According to the invention, the combinations of operating parameters each comprise a set of operating parameters, with at least one speed n and one torque M being included in the set of operating parameters. Preferably, a pair of a torque M and a speed n can represent a point in a speed-torque plot, with the set of points in this speed-torque plot forming a device characteristic curve. According to the invention, the points on the device characteristic curve can also preferably be referred to as operating points of the machine tool, with each operating point being represented by a pair of a torque M and a speed n oris determined by a combination of operating parameters comprising at least a torque M and a speed n.

[0014] According to the invention, it is preferred that the device characteristic curve represents a relationship between the speed n and the torque M of the machine tool. The device characteristic curve can be represented in a speed-torque plot, with the torque M being plotted on the x-axis and the speed n on the y-axis of the corresponding plot. According to the invention, it is preferred that the speed n represents the speed of the motor and / or the speed of the tool of the machine tool. When working with the machine tool, the user preferably moves dynamically along the device characteristic curve, with the current operating point being indicated by a value pair n / M consisting of speed and torque on the device characteristic curve. According to the invention, it is preferred that a device characteristic curve comprises a set of value pairs n / M consisting of speed and torque.In other words, the device characteristic curve is formed by a set of speed-Ztorque value pairs, whereby each operating point of the machine tool can be assigned a specific speed value n and a specific torque value M.

[0015] The speed can, for example, be specified in the unit rounds per minute (rpm). The speed preferably corresponds to the rotational speed of the motor or the motor shaft of the machine tool. The term "speed" can also describe the speed of the tool of the machine tool. The torque M is preferably specified in the unit newton meters (Nm) in the sense of the invention. The work progress AF of the machine tool can preferably be determined in one working direction. In the sense of the invention, this preferably means that work progress is oriented "forwards" in a spatial direction, for example, when the machine tool is held horizontally in order to work on a wall or a fence.If a soil or a floor slab is to be machined with the machine tool, the machine tool can preferably be held vertically or attached to a drill stand, so that the working direction of the machine tool points downwards in a spatial direction. A directional cross with the spatial directions is shown in the figures.

[0016] It is preferred within the meaning of the invention that the setting of the second combination of operating parameters takes place after a time period ZS1. This time period ZS1 can, for example, be stored in the machine tool or preset by the manufacturer of the machine tool. For this purpose, the machine tool can comprise a control unit with a memory device. It is particularly preferred within the meaning of the invention that the setting of the second or further combination of operating parameters takes place automatically. Within the meaning of the invention, this preferably means that the setting no longer has to be carried out manually by a user, but is carried out automatically by the machine tool or its control device. The preferably automatic setting of the operating parameters advantageously makes it possible to avoid the "human" error source, and the setting of the operating parameters can be based on collected data and thus objectified.Tests have shown that this approach can significantly reduce the number of incorrect settings of operating parameters. Since the work with the proposed machine tool or the proposed method focuses on rapid work progress and iteratively optimizes the work progress of the machine tool, the invention can achieve particularly rapid work or drilling progress.

[0017] When comparing the work progress with each other, essentially two different results can be obtained in the sense of a case distinction. If the first work progress AF1 is greater than the second work progress AF2, the operation of the machine tool is continued with the first combination of operating parameters. In the sense of the invention, this preferably means that the machine tool is operated at a first speed n1 and with a first torque M1 if the first work progress AF1 is greater than the second work progress AF2. The continuation of the operation of the machine tool with the first combination of operating parameters can, in the sense of the invention, preferably also be seen as a return to the originally or initially set operation of the machine tool or a return to the originally or initially set combination of operating parameters, iein particular, the first combination of operating parameters. Continuing operation of the machine tool with the first combination of operating parameters preferably means, within the meaning of the invention, that the machine tool continues to be operated with the originally set, first combination of first speed n1 and first torque M1 when the work progress decreases with the second combination of second speed n2 and second torque M2, ie, AF2 is less than AF1: AF2 < AF1.

[0018] If the first work progress AF1 is smaller than the second work progress AF2, the operation of the machine tool can be continued with the second set of operating parameters, i.e., with the second combination of operating parameters. Continuing the operation of the machine tool with the second set of parameters preferably means, within the meaning of the invention, that the machine tool maintains its current, i.e., second, speed n2, as well as its current, i.e., second, torque M2, if the resulting work progress AF2 increases compared to the previous work progress AF1. An increasing work progress means that AF2 is greater than AF1: AF2 > AF1.

[0019] In one embodiment of the invention, it is preferred that the second torque M2 is greater than the first torque M1 (M2 > M1) and the second speed n2 is less than the first speed n1 (n2 < n1) and / or that the third torque M3 is greater than the second torque M2 (M3 > M2) and the third speed n3 is less than the second speed n2 (n3 < n2). In this embodiment of the invention, it is therefore preferred that the combination of operating parameters is shifted from smaller to larger torques M if the work progress of the machine tool is to be increased. The increase in torques can be accompanied by a reduction or lowering of the speed n, so that in this embodiment of the invention, maximum work progress or optimal operation of the machine tool with comparatively high torques and low speeds is achieved.

[0020] In an alternative embodiment of the invention, it is preferred that the second torque M2 is smaller than the first torque M1 (M2 < M1) and the second speed n2 is greater than the first speed n1 (n2 > n1) and / or that the third torque M3 is smaller than the second torque M2 (M3 < M2) and the third speed n3 is greater than the second speed n2 (n3 > n2). In this alternative embodiment of the invention, it is therefore preferred that the combination of operating parameters is shifted from larger to smaller torques M if the work progress of the machine tool is to be increased. Reducing the torques can be accompanied by an increase in the speed n, so that in this embodiment of the invention, maximum work progress or optimal operation of the machine tool is achieved with comparatively low torques and high speeds.

[0021] This embodiment of the invention can be used, for example, when the subsurface changes. If, for example, the machine tool or its tool hits a reinforcing or reinforcement iron in concrete, it may be desirable for the machine tool to be able to provide a higher torque M in order to cut through the reinforcing iron. Machining pure concrete is preferably carried out with a high rotational speed n of the drill bit and a low torque M. If the machine tool detects a reinforcement hit, it is preferred according to the invention to switch from one current parameter set to another parameter set in which the torque M is higher and the rotational speeds n are lower than in the current parameter set.

[0022] Furthermore, as the depth of a borehole increases, it may be desirable to operate the machine tool at a higher torque M, since higher forces may be required to achieve drilling progress due to wall friction. Within the meaning of the invention, it is preferred that, for shallow drilling depths, a parameter set with higher speeds n and lower torques M is used, while for deeper boreholes, the machine tool is operated at lower speeds n and higher torques M.

[0023] It is preferred in the sense of the invention that the machine tool is designed as a drilling device, preferably as a core drilling device, so that the work progress is a drilling progress and / or a tool of the machine tool is a drill bit.In this embodiment, the invention relates to a method for operating a drilling rig, in particular a core drilling rig, the method being characterized by the following method steps: a) operating the drilling rig with a first combination of operating parameters, the first combination of operating parameters comprising a first rotational speed n1 and a first torque M1, b) determining a first drilling progress AF1 of the drilling rig when operating with the first combination of operating parameters, c) setting a second combination of operating parameters, the second combination of operating parameters comprising a second rotational speed n2 and a second torque M2, d) determining a second drilling progress AF2 of the drilling rig when operating with the second combination of operating parameters, e) comparing the first drilling progress AF1 with the second drilling progress AF2, wherein.

[0024] - Continuing the operation of the drilling rig with the first combination of operating parameters if the first drilling progress AF1 is greater than the second drilling progress AF2, and

[0025] - Continuation of the operation of the machine tool with the second combination of operating parameters if the first drilling progress AF1 is smaller than the second drilling progress AF2.

[0026] Method step e), ie the comparison of the work progresses with one another, can be repeated until a combination of operating parameters is found at which the work progress of the machine tool is maximum. In the sense of the invention, it can be preferred that this maximum or optimal work or drilling progress varies depending on the material of the substrate to be machined. For example, unreinforced concrete can be machined with a combination of a comparatively high speed and a comparatively low torque, while reinforced concrete, particularly in the area of ​​the reinforcement, is ideally machined with an increased torque, with a higher torque preferably being associated with a lower speed.

[0027] According to the invention, it is preferred that the operation of the drilling rig be continued with the second combination of operating parameters if the first drilling progress AF1 is similar to the second drilling progress AF2. In other words, work with the machine tool can be continued with the second or current parameter set if the drilling progresses are within a similar range.

[0028] It is particularly preferred in the sense of the invention that the process step e: “Comparison of the work progress” is repeated with the following proviso:

[0029] Comparison of the previous work progress AF(i-1) with the current work progress AF(i), where

[0030] - Continuation of the operation of the machine tool with the (i-1)-th combination of operating parameters if the (i-1)-th work progress is greater than the i-th work progress, and

[0031] - Continue the operation of the machine tool with the i-th combination of operating parameters if the (i-1 )-th work progress is smaller than the i-th work progress.

[0032] The continuation of the operation of the machine tool with the (i-1)th combination of operating parameters preferably corresponds in the sense of the invention to a return to the previously set operation of the machine tool or a return to the previously set combination of operating parameters, ie in particular the (i-1)th combination of operating parameters.

[0033] According to the invention, it is preferred that the operation of the machine tool be continued with the i-th combination of operating parameters if the (i-1)-th work progress AF1 is similar to the i-th work progress AF2. In other words, work with the machine tool can be continued with the i-th parameter set if the work progresses are in a similar range. By repeating method step e: "Comparison of the work progresses" in this way, an optimal combination of operating parameters, in particular torque and speed, can be found at which the work progress of the machine tool or drilling machine is maximum.By preferably continuously iterating the work progress comparisons throughout the entire operation of the machine tool, it is advantageously possible to ensure that the machine tool is always operated in a way that is optimized for the current application requirements. For example, if the surface to be machined changes, the machine tool can use the proposed method to set different sets or combinations of operating parameters, such as torque and speed, and, by comparing the respective work progresses, determine which combination of operating parameters should be used to continue working. Preferably, the machine tool returns to an earlier set of operating parameters when the work progress decreases, while the machine tool sets a new set of operating parameters when the work progress increases.

[0034] In a further aspect, the invention relates to a machine tool for carrying out the proposed method for operating a machine tool. The terms, definitions, and technical advantages introduced for the operating method preferably apply analogously to the machine tool. The machine tool is characterized in that the machine tool is designed as a drilling device, preferably as a core drilling device, so that the work progress is a drilling progress and / or a tool of the machine tool is a drill bit. The machine tool can preferably detect sensors for determining the work progress. These can preferably be internal and / or external sensors. Internal sensors within the meaning of the invention are installed in the machine tool or are integrated into the machine tool. These can be, for example, distance sensors or speed sensors.The distance sensors can preferably be based on physical measuring principles or types of radiation, such as lasers, light, i.e. electromagnetic radiation with visible wavelengths, or ultrasound. The external sensors can preferably be sensors that can be attached or fastened to the machine tool or to accessory devices for the machine tool, such as drill stands, feed devices or the like. External sensors can, for example, be connected to the machine tool with a cable or wirelessly or can communicate with the machine tool. The external sensors can also be distance sensors, speed sensors and displacement sensors, without being limited to these. The sensors are preferably each designed to communicate with the machine tool or to exchange data in such a way that measured values ​​can be transmitted from the sensors to the machine tool.This can preferably be raw data or data that has already been processed using IT. Data exchange between the machine tool and the sensors is preferably wireless and / or wired.

[0035] Within the meaning of the invention, it may also be preferred for the machine tool to be connectable to an accessory device, wherein the accessory device is configured to determine the work progress of the machine tool. Preferably, the accessory device can be a feed device for generating a feed for the machine tool. For example, the feed device can be an automatic feed device with which a feed for the machine tool can be generated and transmitted to the machine tool. In one embodiment of the invention, the feed device can comprise a speed sensor configured to determine a speed of a motor or rotor of the feed device. The feed device or the speed sensor can furthermore be configured to determine a drilling feed per rotor revolution based on the determined speed and to transmit it to the machine tool.

[0036] Further advantages emerge from the following description of the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into further meaningful combinations. In the figures, identical and similar components are numbered with the same reference numerals. They show:

[0037] Fig. 1 View of an exemplary design of a machine tool

[0038] Fig. 2 View of an exemplary embodiment of a machine tool mounted on a

[0039] Drill stand is attached and connected to an accessory device.

[0040] Implementation example and figure description:

[0041] Figure 1 shows an exemplary embodiment of a machine tool 10. The machine tool 10 can be designed as a drilling device, in particular as a core drilling device, and can have a core bit as the tool 12 (shown schematically). The tool 12 can be attached to the machine tool 10 using a tool holder 38. The tool 12 of the machine tool 10 is preferably configured to perform a rotary movement, wherein the tool 12 can be driven to perform the rotary movement by a motor 16 of the machine tool 10. The power supply to the machine tool 10 can be provided via a power supply device 18, which can be designed, for example, as a rechargeable battery. The machine tool 10 can have various handles 34, 36, wherein the machine tool 10, which is depicted in Figure 1 as an embodiment of the invention, has a rear handle 34 and a front handle 36.The front handle 36 can, for example, be designed to be rotatable, so that the front handle 36 can, for example, protrude to the side or extend in a spatial direction "downwards". The spatial directions "top O", "bottom U", "front V" and "back H" are indicated in the figures by directional crosses. If the machine tool 10 - as in Figure 1 - is held horizontally, for example in order to drill a hole in a wall or a partition, the working direction preferably corresponds to the spatial direction "forwards V". If the machine tool 10 - as shown in Figure 2 - is arranged on a drill stand 30 and is machining a floor surface or a subsurface, the working direction of the machine tool 10 preferably corresponds to the spatial direction "downwards U".

[0042] The machine tool 10 can comprise a housing 20, which, for example, comprises the motor 16 and / or the energy supply device 18 of the machine tool 10. The housing 20 can be formed in one or more parts, wherein the housing 20 depicted in Figure 1 is formed in two parts in the sense that it comprises a motor housing and a battery housing, wherein the motor housing is configured to accommodate the motor 16 of the machine tool 10 and wherein the battery housing is configured to accommodate the energy supply device 18 of the machine tool 10.

[0043] The machine tool 10 can have at least one sensor 22 that is configured to detect a work progress of the machine tool 10. The at least one sensor 22 can be arranged at many different locations and positions on the machine tool 10. Figure 2 shows an exemplary embodiment of a machine tool 10 that is attached to a drill stand 30 and connected to an accessory device 14. The accessory device 14 can, for example, be a feed device that is configured to generate a feed for the machine tool 10. The feed device 14 shown in Figure 2 is a manual feed device 14 that includes a handwheel. However, within the meaning of the invention, it can also be preferred for the feed device 14 to be an automatic feed device 14.The accessory device 14 is preferably capable of detecting the work progress of the machine tool 10. The accessory device 14 may also include sensors 24 for this purpose. The position of the sensor 24 for detecting the work progress of the machine tool is shown in Fig. 2.

[0044] 10 is to be understood as an example. Of course, the sensor 24 can also be arranged at other locations on the accessory device 14, which is preferably designed as a feed device.

[0045] List of reference symbols

[0046] 10 Machine tool

[0047] 12 Machine tool tool

[0048] 14 Machine tool accessory device

[0049] 16 Machine tool motor

[0050] 18 Power supply device of the machine tool

[0051] 20 Machine tool housing

[0052] 22 Sensor on the machine tool

[0053] 24 Sensor on the accessory device

[0054] 30 drill stands

[0055] 34 rear handle

[0056] 36 front handle

[0057] 38 tool holder

[0058] V Spatial direction “forward”, front side H Spatial direction “backward”, back side

[0059] U spatial direction “downwards”, bottom

[0060] O Spatial direction “upwards”, top side

Claims

Patent claims 1. Method for operating a machine tool (10), comprising the following method steps: a) operating the machine tool (10) with a first combination of operating parameters, wherein the first combination of operating parameters comprises a first rotational speed n1 and a first torque M1, b) determining a first work progress AF1 of the machine tool (10) when operating with the first combination of operating parameters, c) setting a second combination of operating parameters, wherein the second combination of operating parameters comprises a second rotational speed n2 and a second torque M2, d) determining a second work progress AF2 of the machine tool (10) when operating with the second combination of operating parameters, e) comparing the first work progress AF1 with the second work progress AF2, wherein - Continuation of the operation of the machine tool (10) with the first combination of operating parameters if the first work progress AF1 is greater than the second work progress AF2, and - Continuation of the operation of the machine tool (10) with the second combination of operating parameters if the first work progress AF1 is smaller than the second work progress AF2.

2. Method according to claim 1 characterized in that the second torque M2 is preferably greater than the first torque M1 (M2 > M1) and the second rotational speed n2 is preferably less than the first rotational speed n1 (n2 < n1).

3. Method according to claim 1 characterized in that the second torque M2 is preferably smaller than the first torque M1 (M2 < M1) and the second rotational speed n2 is preferably larger than the first rotational speed n1 (n2 > n1). A method according to any one of the preceding claims, characterized in that the machine tool (10) is configured as a drilling device, preferably as a core drilling device, such that the work progress is a drilling progress and / or a tool (12) of the machine tool (10) is a drill bit. A method according to any one of the preceding claims, characterized in that the method step e: “comparison of work progress” is repeated until a combination of operating parameters is found at which the work progress of the machine tool (10) is maximized. A method according to any one of the preceding claims, characterized in that the method step e: “comparison of work progress” is repeated with the following stipulation: Comparison of the previous work progress AF(i-1) with the current work progress AF(i), where - Continuation of the operation of the machine tool (10) with the (i-1)th combination of operating parameters if the (i-1)th work progress is greater than the i-th work progress, and - Continuation of operation of the machine tool (10) with the (i)th combination of operating parameters if the (i-1)th work progress is smaller than the i-th work progress. Machine tool (10) for carrying out the method according to one of the preceding claims. Machine tool (10) according to claim 7, characterized in that the machine tool (10) is configured as a drilling device, preferably as a core drilling device, such that the work progress is a drilling progress and / or a tool (12) of the machine tool (10) is a drill bit. A machine tool (10) according to claim 7 or 8, characterized in that the machine tool (10) detects sensors (22) for determining the work progress. A machine tool (10) according to any one of claims 7 to 9, characterized in that the machine tool (10) is connectable to an accessory device (14), the accessory device being configured to determine the work progress of the machine tool (10). A machine tool (10) according to claim 10, characterized in that the accessory device (14) is a feed device for generating a feed for the machine tool (10).

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