Hydrostatic spindle performance testing device

Abstract

The utility model discloses a kind of static pressure spindle performance testing devices, including installation platform, and be located on the rotating shaft operating assembly, loading assembly and measuring assembly of the installation platform;The loading assembly is located above the rotating shaft operating assembly;The loading assembly includes force device, sliding assembly, load cell and ejector rod;The sliding assembly includes loading support and guide rail, the guide rail is fixedly connected with the installation platform, and the loading support is slidably connected with the guide rail;The force device is located on the loading support, and the load cell is located on the load output end of the force device;The ejector rod is located below the load cell. The above-mentioned technology can be simulated to the working condition of the spindle to be tested under uniform load or eccentric load, so as to improve the comprehensiveness of static pressure spindle performance test.

Description

Technical Field

[0001] This utility model relates to the field of hydrostatic spindle technology, specifically to a hydrostatic spindle performance testing device. Background Technology

[0002] A hydrostatic spindle is a device that achieves high-speed rotation based on the principle of hydrostatic balance of liquids or gases. It boasts advantages such as high rigidity, high-speed rotational stability, automatic compensation, and frictionlessness. Based on these advantages, hydrostatic spindles have become one of the core technologies of ultra-precision machining equipment. Among them, the liquid hydrostatic spindle unit, relying on oil film support, possesses extremely high load-bearing capacity and damping characteristics, effectively suppressing cutting vibrations and making it suitable for large-scale, heavy-duty precision machining scenarios.

[0003] When manufacturing hydrostatic spindles, it is necessary to design various parameters of the hydrostatic spindle to better serve the application scenarios. Existing research shows that the performance of hydrostatic spindles is affected by the coupling of multiple factors. For example, the type of throttle determines the flow-pressure characteristics, the geometric parameters of the oil chamber directly affect the load-bearing stiffness and stability, and the viscosity of the lubricating medium, pressure fluctuations, and temperature changes may cause dynamic characteristic drift. For example, patent CN117759605A discloses a hydrostatic spindle testing device, which uses components such as a support platform, spindle motor, coupling, and throttle to suspend the hydrostatic spindle. A hydraulic testing mechanism is designed to test the hydraulic oil of the throttle to study the dynamic and static characteristics of the hydrostatic spindle under different operating conditions. At the same time, there is also a spindle tracing and testing mechanism to test the dynamic stiffness, static stiffness, and rotational accuracy of the hydrostatic spindle. However, this patent only tests the axial stiffness of the hydrostatic spindle using an external force hammer when detecting radial dynamic stiffness, and also tests the performance of the hydrostatic spindle in operation.

[0004] Furthermore, existing theoretical models for hydrostatic spindle performance are insufficient to accurately characterize the fluid-structure-thermal coupling effect under complex operating conditions. This leads to discrepancies between the expected and actual performance of hydrostatic spindles manufactured based on spindle design parameters calculated using existing theories. Therefore, to accurately test the performance of hydrostatic spindles, verify and revise existing theoretical models, seek the optimal structural parameters of hydrostatic spindles, and validate their working performance, a high-precision testing device capable of realistically simulating the operating conditions of hydrostatic spindles is urgently needed. Utility Model Content

[0005] To address the problem that existing testing devices cannot simulate the actual working conditions of hydrostatic spindles, this utility model provides the following technical solution:

[0006] A hydrostatic spindle performance testing device includes a mounting platform, and a spindle running component, a loading component, and a measuring component disposed on the mounting platform; the loading component is disposed above the spindle running component; the loading component includes a force application device, a sliding component, a load cell, and a push rod; the sliding component includes a loading bracket and a guide rail, the guide rail is fixedly connected to the mounting platform, and the loading bracket is slidably connected to the guide rail; the force application device is disposed on the loading bracket, and the load cell is disposed at the load output end of the force application device; the push rod is disposed below the load cell.

[0007] Preferably, the force-applying device includes a screw loading device and a piezoelectric actuator. The screw loading device includes an adjusting handle and a force-applying rod connected to the adjusting handle. The piezoelectric actuator is disposed between the force-applying rod and the weighing sensor.

[0008] Preferably, the sliding assembly further includes a slide rail connector and a self-locking slider; the loading bracket is slidably connected to the guide rail through the slide rail connector; the self-locking slider is disposed between the slide rail connector and the guide rail, and at least one self-locking slider is provided at both the left and right ends of the bottom surface of the slide rail connector.

[0009] Preferably, the measuring component is located at one end of the spindle to be tested; the measuring component includes a measuring fixture, a displacement platform, and a displacement sensor; the displacement platform is located on the measuring fixture, and the displacement sensor is located on the displacement platform.

[0010] Preferably, the displacement sensor is a laser displacement sensor; the displacement platform corresponds one-to-one with the displacement sensor; the displacement platform includes a displacement base and a fine-tuning knob, and the displacement sensor is slidably mounted on the displacement base.

[0011] Preferably, the installation position of the displacement sensor falls on the coincidence plane of the normal and radial directions of the spindle to be tested.

[0012] Preferably, the rotating shaft running assembly includes a drive device and a spindle suspension assembly; the drive device is connected to the end of the spindle to be tested away from the measuring assembly; the spindle suspension assembly includes multiple bearing brackets fixed on the mounting platform, and a radial bearing disposed on the bearing brackets; the spindle to be tested is disposed within the radial bearing.

[0013] Preferably, the radial bearing is provided with a static pressure medium inlet, the bearing bracket is provided with a static pressure medium channel and a static pressure medium outlet, and the end face of the bearing bracket is provided with a sealing groove for installing a seal.

[0014] Preferably, the spindle suspension assembly further includes a load positioning assembly; the load positioning assembly includes a positioning collar, a rolling bearing, and a rolling bearing sleeve fitted onto the rolling bearing, the rolling bearing sleeve having a pressure groove.

[0015] Preferably, the driving device includes a drive motor, and the drive motor is connected to the end of the spindle to be tested away from the measuring component by a coupling.

[0016] Compared with the prior art, the present invention has the following advantages: (1) The test device of the present application can simulate the force and vibration of the spindle under test by adjusting only the screw loading device and the piezoelectric actuator. It has the characteristics of simple operation, high measurement accuracy and easy operation; (2) The present application applies force to the hydrostatic spindle by the screw loading device in the loading assembly and moves the loading assembly on the guide rail, so that the test device can simulate the working conditions of the spindle under test being uniformly loaded or unevenly loaded, thereby simulating various working conditions of the spindle and improving the comprehensiveness of the spindle performance test; (3) The present application sets a piezoelectric actuator in the loading assembly to generate various types of excitation, so that the spindle performance can be tested under different working conditions; (4) By sleeved rolling bearings and rolling bearing sleeves on the spindle under test, the spindle under test can be subjected to various vibrations during operation. The performance of the test is tested; at the same time, by setting the pressure groove depth of the rolling bearing sleeve to 2-3mm, the flat-head push rod is not accurately positioned due to the pressure groove being too shallow, or the flat-head push rod is too difficult to position due to the pressure groove being too deep. The positioning is accurate, ensuring that the spindle under test is subjected to uniform force; (5) This application sets 4 static pressure medium inlets around the radial bearing and sets the static pressure medium outlet at the bottom of the bearing bracket, ensuring the circulation of the static pressure medium passage, thereby effectively ensuring that the spindle under test is stably suspended in the center position; (6) This application can collect the radial and normal displacements of the spindle under test in a comprehensive and accurate manner by installing laser displacement sensors in the radial and normal directions, providing a basis for the stability analysis of the spindle under test; (7) This application ensures that the loading component can be fixed in any position by setting multiple self-locking sliders, and ensures the reliability of the fixation. Attached Figure Description

[0017] Figure 1 This is a front view of the testing apparatus described in this application;

[0018] Figure 2 This is a side view of the test apparatus described in this application;

[0019] Figure 3 This is the front view of the main axis suspension component of this application. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1:

[0022] A hydrostatic spindle performance testing device includes a mounting platform 11, and a spindle running assembly, a loading assembly, and a measuring assembly mounted on the mounting platform 11, such as... Figures 1-3 As shown. The spindle under test 100 is housed in the rotating shaft running assembly, which is used to suspend the spindle under test in a suspended state. The rotating shaft running assembly 11 suspends and drives the spindle under test 100 to rotate. The loading assembly is located above the spindle under test 100 and is used to apply a load to the spindle under test 100 to simulate the force conditions of the spindle under test 100 in a static or running state. The measuring assembly 3 is located at one end of the spindle under test 100 and is used to accurately measure the deformation and / or offset of the spindle under test 100 under different simulated working conditions.

[0023] Specifically, such as Figure 1 As shown, the loading assembly includes a force-applying device 21, a sliding assembly 22, a load cell 23, and a top rod 24. The force-applying device 21 is mounted on the sliding assembly 22, the load cell 23 is located at the load output end of the force-applying device 21, and the top rod 24 is located below the load cell 23. The mounting platform 11 is preferably made of marble.

[0024] The force-applying device 21 is used to output a load and transmit the load to the spindle 100 under test via the push rod 24, thereby testing the static and dynamic stiffness of the spindle 100. The force-applying device 21 includes a helical loading device 211, which applies an adjustable load to the spindle 100 under test. The helical loading device 211 includes an adjusting handle 213 and a force-applying rod 214 connected to the adjusting handle 213. The load force is adjusted by rotating the adjusting handle 213.

[0025] The load cell 23 is used to measure the force applied to the spindle 100 under test by the force application device 22, and it is located below the force application rod 214. The push rod 24 is located below the load cell 23 and is used to apply the load generated by the force application device 21 to the spindle 100 under test. Preferably, the push rod 24 is a flat-headed push rod.

[0026] The sliding assembly 22 allows the loading assembly to move axially along the spindle 100 under test, simulating the off-center loading condition of the spindle 100. The sliding assembly 22 is connected to the mounting platform 11. The sliding assembly 22 includes a loading bracket and a guide rail 223; the guide rail 223 is fixedly connected to the mounting platform 11 and is positioned on both sides of the mounting platform 11 along the axial direction of the spindle 100 under test; the loading bracket includes a vertical beam 221 and a horizontal beam 222; the vertical beam 221 is slidably connected to the guide rail 223 via a slide rail connector 224; the horizontal beam 222 is located between the vertical beams 221, and the force application device 21 is fixedly connected to the horizontal beam. Additionally, the sliding assembly 22 also includes multiple self-locking sliders 225, which are located at the bottom of the slider connector 224 and cooperate with the guide rail 223. The self-locking sliders 225 fix the position of the loading bracket. The self-locking slider 225 is disposed at both ends of the slider connector 224. Preferably, there are two slider connectors 224 and four self-locking sliders 225, with one self-locking slider 225 disposed at each end of the slider connector 224.

[0027] Furthermore, to simulate the vibration under operating conditions of the spindle 100 under test, the force application device 21 also includes a piezoelectric actuator 212. The piezoelectric actuator 212 can generate vibrations of various types, such as triangular waves, square waves, and pulse waves, thereby simulating the multi-condition vibration of the spindle 100 under test. The piezoelectric actuator 212 is connected to the helical loading device 211, specifically, the piezoelectric actuator 212 is located between the force application rod 214 and the weighing sensor 23.

[0028] like Figure 3 As shown, the rotating shaft running assembly 2 includes a drive device and a spindle suspension assembly. The hydrostatic spindle 100 to be tested is installed in the spindle suspension assembly so that the hydrostatic spindle 100 to be tested is in a hydrostatic suspension state; the end of the hydrostatic spindle 100 to be tested away from the measuring assembly is connected to the drive device to provide power for the rotation of the spindle 100 to be tested.

[0029] like Figure 2As shown, the measuring component 3 is located at the other end of the hydrostatic spindle 100 to be tested, i.e., at the end away from the drive device. It includes a measuring fixture 31, a displacement platform 32, and a displacement sensor 33. The measuring fixture 31 is fixedly connected to the mounting platform 11, the displacement platform 32 is mounted on the measuring fixture 31, and the displacement sensor 33 is connected to the displacement platform 32. The displacement platform 32 is used to adjust the position of the displacement sensor 33 so that the displacement sensor 33 can accurately capture changes in the spindle 100 to be tested. The displacement sensor 33 can measure the radial and normal displacements of the spindle 100 to be tested.

[0030] In use, the hydrostatic spindle 100 to be tested is inserted into the rotating shaft running assembly to make the hydrostatic spindle 100 to be tested float; then the loading assembly is moved to the load position of the spindle 100 to be tested, and the force application device 21 is adjusted so that the force application rod 214 acts on the load point of the spindle 100 to be tested. The calibrated weighing sensor 23 is zeroed with one key, and the loading bracket is locked and fixed using the self-locking slider 225; then the position of the displacement platform 32 is adjusted so that the displacement sensor 33 can accurately measure the radial and normal deformation and / or displacement of the spindle 100 to be tested.

[0031] During testing, the load applied by the screw loading device 21 is changed by rotating the adjustment handle 213, and the pressure value of the applied load is measured by the weighing sensor 23. Then, the load is applied to the spindle 100 under test through the force bar 214, and the displacement value of the spindle 100 under test is measured by the measuring component.

[0032] When it is necessary to measure the static stiffness of the spindle 100 to be tested: the spindle 100 to be tested is in a static state. The adjustment handle 213 is rotated multiple times to change the load. Then, the static pressure value of the weighing sensor 23 and the displacement value measured by the displacement sensor 32 are substituted into formula (1) to obtain the static stiffness of the spindle 100 to be tested.

[0033] k s =F s / ΔS (Formula 1)

[0034] Where, k s F represents the static stiffness of the spindle 100 to be tested. s ΔS represents the measured static pressure value, and ΔS represents the measured displacement value.

[0035] When it is necessary to measure the load-bearing capacity of the spindle 100 under test: start the drive device to drive the spindle 100 under test to rotate, and adjust the drive device to make the spindle 100 under test reach the speed of the simulated working condition. Then, by continuously adjusting the load applied by the screw loading device 21, observe the load threshold when the spindle 100 under test becomes unstable, and read the threshold pressure value of the weighing sensor 23 at this time. Then, obtain multiple threshold pressure values ​​through multiple experiments. The load-bearing capacity of the spindle 100 under test can be obtained by averaging the multiple threshold pressure values.

[0036] When it is necessary to measure the stability of the spindle 100 under test: Start the drive device to rotate the spindle 100 under test. Adjust the drive device to make the spindle 100 reach the speed of the simulated working condition. Adjust the screw loading device 21 to apply the load to the simulated working condition. Then lock the screw loading device 6 to prevent the load from changing. Then turn on the piezoelectric actuator 212 and use an external controller to make the piezoelectric actuator 8 output the excitation of the simulated working condition. After the spindle 100 under test stabilizes, the load cell 23 and displacement sensor 32 collect data. Based on the displacement electrical signal collected by the displacement sensor 32, amplitude-frequency analysis and phase-frequency analysis are performed to comprehensively evaluate the stability of the spindle 100 under test.

[0037] The above technical solution can simulate the working conditions of the spindle 100 under uniform or eccentric load, thereby improving the comprehensiveness of the hydrostatic spindle performance test; at the same time, various types of excitation are generated by the piezoelectric actuator to realize the performance test of the hydrostatic spindle under different working conditions.

[0038] Example 2:

[0039] The difference between this embodiment and embodiment 2 is that, as Figure 2 As shown, there are multiple displacement sensors 33, and the displacement platform 32 corresponds one-to-one with the displacement sensor 33; preferably, the displacement sensor 33 is a laser displacement sensor.

[0040] In this specific embodiment, there are two displacement sensors 33, and the positions of the two displacement sensors 33 on the measuring fixture 31 fall within the coincident plane of the normal and radial directions of the spindle 100 to be tested. Figure 2As shown, the displacement platform 32 includes a horizontal displacement platform and a vertical displacement platform. Each displacement platform includes a fine-tuning knob 321 and a displacement base 322; the displacement sensor 33 is slidably connected to the displacement base 322; the displacement base 322 is fixedly connected to the measuring bracket 31. The horizontal displacement platform refers to the horizontal movement of the displacement sensor 33 along the displacement base 322; the vertical displacement platform refers to the vertical movement of the displacement sensor 33 along the displacement base 322. By rotating the fine-tuning knob 321, the displacement sensor 33 can move linearly along the displacement base 322, thereby precisely adjusting the position of the displacement sensor 33.

[0041] In use, by adjusting the displacement platform 32, the laser emitted by the displacement sensor 33 is focused on the outer surface of the spindle 100 to be tested, so that the laser reflected by the curved surface of the spindle 100 to be tested is captured by the receiving lens in the displacement sensor 33, thereby accurately measuring the radial displacement of the spindle 100 to be tested.

[0042] Example 3:

[0043] The difference between this embodiment and embodiments 1 or 2 lies in the specific structure of the rotating shaft running component, as follows: Figure 3 As shown.

[0044] The spindle suspension assembly in the rotating shaft running assembly includes multiple bearing supports 13 and multiple radial bearings 14. The bearing supports 13 are fixedly installed on the mounting platform 11 at certain intervals. The radial bearings 14 are mounted on the bearing supports 13, with one radial bearing 14 installed between every two bearing supports 13. Each bearing support 13 has a static pressure medium channel and a static pressure medium outlet, and each radial bearing 14 has a static pressure medium inlet. Preferably, four static pressure medium inlets are evenly arranged along the circumference of each radial bearing 14.

[0045] Meanwhile, the end face of the bearing bracket 13 is provided with a sealing groove for installing a seal to prevent the radial bearing 14 from leaking from the mounting end face of the bearing bracket 13 and to prevent the static pressure medium from leaking from the radial bearing 14 and the bearing bracket 13.

[0046] The driving device includes a drive motor 12, a motor mounting base plate 15, and a motor mounting bracket 16. Both the motor mounting base plate 15 and the motor mounting bracket 16 are fixed to the mounting platform 11 to provide support for the drive motor 12. The motor mounting bracket 16 is perpendicular to the motor mounting base plate, and the drive motor 12 is fixedly connected to the motor mounting bracket 16. The position of the drive motor 12 can be adjusted by adjusting the height of the motor mounting bracket 16. The drive motor 12 is connected to one end of the spindle 100 to be tested. The driving device also includes a coupling 17, through which the drive motor 12 is connected to the spindle 100 to be tested. Preferably, the coupling 17 is a bellows coupling; by selecting a bellows coupling that is lightweight, has low inertia, and high transmission accuracy, installation deviations can be compensated for, and frequent starts and stops can be avoided, thereby ensuring the accuracy of measurement and the convenience of operation.

[0047] Furthermore, the spindle suspension assembly also includes a load positioning assembly; the load positioning assembly includes a positioning collar, rolling bearings, and rolling bearing sleeves 18. The positioning collar is sleeved and fixedly installed at the test position of the spindle 100 to be tested, and the rolling bearing sleeve 18 is sleeved on the rolling bearing, and the positioning collar positions the rolling bearing. During installation, a pair of rolling bearings and rolling bearing sleeves are set on each side of the positioning collar, and then fasteners such as bolts are used to connect the two rolling bearing sleeves to clamp them together, thereby completing the fixation of the rolling bearings. During operation, the loading assembly applies the load to the rolling bearing sleeve 18, and the rolling bearing transmits the load to the spindle 100 to be tested. In addition, to prevent the loading assembly from shifting when applying the load, the outer periphery of the rolling bearing sleeve 18 is provided with a pressure groove, so that the loading assembly can quickly and accurately position the load application position. The depth of the pressure groove is preferably 2~3mm to avoid positioning difficulties or inaccuracies of the loading assembly due to the pressure groove being too deep or too shallow.

[0048] During testing, first adjust the positioning collar and rolling bearing 16 to install them in the load-bearing position of the spindle 100 to be tested. After fixing the rolling bearing 16 with the positioning collar, start the rotating shaft running assembly 1 to suspend the spindle 100 to be tested in the center position. Then, slide the loading bracket along the guide rail 223 to the corresponding loading position and adjust the screw loading device 21 to drive the push rod 24 into the pressure groove of the rolling bearing sleeve 16. Finally, adjust the measuring assembly and start the test on the spindle 100 to be tested.

[0049] When the rotating shaft running assembly 1 is working, the hydrostatic spindle 100 to be tested is first passed through multiple radial bearings 14. Then, hydrostatic medium is introduced from the hydrostatic medium station through the delivery pipe into the radial bearings 14 via the hydrostatic medium inlet, so that the space between the hydrostatic spindle 100 to be tested and the radial bearings 14 is filled with hydrostatic medium, so that the hydrostatic spindle 100 to be tested is in a stable suspended state. Then, the hydrostatic medium overflowing from the end face of the radial bearings 14 flows out through the hydrostatic medium channel in the bearing support 13 and flows out of the test equipment through the hydrostatic medium outlet, returning to the hydrostatic medium station. This hydrostatic medium circuit ensures that the hydrostatic medium supply between the hydrostatic spindle 100 to be tested and the radial bearings 14 is sufficient, thereby making the hydrostatic spindle 100 to be tested stably suspended in the center position of the radial bearings 14.

[0050] It should be noted that the technical features in embodiments 1 to 3 above can be combined arbitrarily, and the resulting technical solutions all fall within the protection scope of this application. Furthermore, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrostatic spindle performance testing device, comprising a mounting platform, and a spindle running assembly, a loading assembly, and a measuring assembly disposed on the mounting platform; characterized in that, The loading component is located above the rotating shaft running component; the loading component includes a force application device, a sliding component, a load cell, and a top rod; the sliding component includes a loading bracket and a guide rail, the guide rail is fixedly connected to the mounting platform, and the loading bracket is slidably connected to the guide rail; the force application device is located on the loading bracket, and the load cell is located at the load output end of the force application device; the top rod is located below the load cell.

2. The testing apparatus as described in claim 1, characterized in that, The force-applying device includes a screw loading device and a piezoelectric actuator. The screw loading device includes an adjusting handle and a force-applying rod connected to the adjusting handle. The piezoelectric actuator is located between the force-applying rod and the weighing sensor.

3. The testing apparatus as described in claim 1, characterized in that, The sliding assembly further includes a slide rail connector and a self-locking slider; the loading bracket is slidably connected to the guide rail through the slide rail connector; the self-locking slider is disposed between the slide rail connector and the guide rail, and at least one self-locking slider is provided at both the left and right ends of the bottom surface of the slide rail connector.

4. The testing apparatus as described in claim 1, characterized in that, The measuring component is located at one end of the spindle to be tested; the measuring component includes a measuring fixture, a displacement platform, and a displacement sensor; the displacement platform is located on the measuring fixture, and the displacement sensor is located on the displacement platform.

5. The testing apparatus as described in claim 4, characterized in that, The displacement sensor is a laser displacement sensor; the displacement platform corresponds one-to-one with the displacement sensor; the displacement platform includes a displacement base and a fine-tuning knob, and the displacement sensor is slidably mounted on the displacement base.

6. The testing apparatus as described in claim 5, characterized in that, The displacement sensor is installed in a plane that coincides with the normal and radial directions of the spindle to be tested.

7. The testing apparatus as described in claim 1, characterized in that, The rotating shaft running assembly includes a drive device and a spindle suspension assembly; the drive device is connected to the end of the spindle to be tested away from the measuring assembly; the spindle suspension assembly includes multiple bearing brackets fixed on the mounting platform, and radial bearings disposed on the bearing brackets; the spindle to be tested is disposed within the radial bearings.

8. The testing apparatus as described in claim 7, characterized in that, The radial bearing is provided with a static pressure medium inlet, the bearing bracket is provided with a static pressure medium channel and a static pressure medium outlet, and the end face of the bearing bracket is provided with a sealing groove for installing a seal.

9. The testing apparatus as described in claim 7, characterized in that, The main shaft suspension assembly also includes a load positioning assembly; the load positioning assembly includes a positioning collar, a rolling bearing, and a rolling bearing sleeve fitted on the rolling bearing, the rolling bearing sleeve having a pressure groove.

10. The testing apparatus as described in claim 7, characterized in that, The driving device includes a drive motor, which is connected to the end of the spindle to be tested away from the measuring component by a coupling.

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