CN222903409U - Numerical control grinding machine for ball head cutter - Google Patents

Abstract

The application discloses a numerical control grinding machine for a ball head cutter, and relates to the technical field of machine tools. The ball head cutter numerically-controlled grinder comprises a lathe body, a workpiece frame assembly and a grinding wheel frame assembly, wherein the workpiece frame assembly and the grinding wheel frame assembly are arranged on a mounting surface of the lathe body in a sliding mode, the workpiece frame assembly comprises a first workpiece frame, a second workpiece frame and a rotary table, the first workpiece frame is arranged on the lathe body in a sliding mode along an X axis, the rotary table is arranged on the first workpiece frame, the second workpiece frame is arranged on the rotary table, the second workpiece frame is used for mounting a workpiece to be machined, the grinding wheel frame assembly comprises a grinding wheel frame which is arranged on the lathe body in a sliding mode along a Y axis and a mounting plate which is connected with the grinding wheel frame in a sliding mode along a Z axis, the grinding wheel assembly is arranged on the mounting plate and used for grinding the workpiece to be machined, and the grinding wheel frame can be driven to move towards a direction close to or far away from the workpiece frame assembly. The machining precision of the ball head cutter can be improved.

Description

Numerical control grinding machine for ball head cutter

Technical Field

The application relates to the technical field of machine tools, in particular to a numerical control grinding machine for a ball head cutter.

Background

The ball head cutter is a novel structural cutter for processing complex curved surfaces on a numerical control machine tool, is also one of the most important cutters in the finish machining of complex three-dimensional curved surfaces, has high processing precision and long service life, meets the requirement of automatic processing of complex space curved surfaces, and is widely used in the manufacturing industry.

In the prior art, a simple sharpening device is generally adopted to carry out grinding processing on the ball head cutter, the processing precision of the device is lower, and the processing quality of the ball head cutter cannot be ensured.

Disclosure of utility model

The application aims to provide a numerical control grinding machine for a ball head cutter, which can improve the machining precision of the ball head cutter.

Embodiments of the present application are implemented as follows:

The application provides a ball head cutter numerically controlled grinder, which comprises a lathe body, a workpiece frame assembly and a grinding wheel frame assembly, wherein the workpiece frame assembly and the grinding wheel frame assembly are arranged on a mounting surface of the lathe body in a sliding mode, the workpiece frame assembly comprises a first workpiece frame, a second workpiece frame and a rotary table, the first workpiece frame is arranged on the lathe body in a sliding mode along an X axis, the rotary table is arranged on the first workpiece frame, the second workpiece frame is arranged on the rotary table, the second workpiece frame is used for mounting a workpiece to be machined, the grinding wheel frame assembly comprises a grinding wheel frame arranged on the lathe body in a sliding mode along a Y axis and a mounting plate connected with the grinding wheel frame in a sliding mode along a Z axis, the grinding wheel assembly is arranged on the mounting plate, and the grinding wheel assembly is used for grinding the workpiece to be machined and can be driven to move towards or away from the workpiece frame assembly.

Optionally, as an implementation manner, the bed body is provided with a first linear driving piece, and the first linear driving piece drives the first workpiece rest to do reciprocating linear motion along the X axis.

Optionally, as an implementation manner, the bed body is provided with a second linear driving piece, and the second linear driving piece drives the grinding carriage to do reciprocating linear motion along the Y axis.

Optionally, as an implementation manner, a third linear driving piece is arranged on the grinding carriage, and the third linear driving piece drives the mounting plate to do reciprocating linear motion along the Z axis.

Optionally, as an implementation manner, a sliding rail is laid on the second workpiece rest, a workpiece mounting rack for mounting a workpiece to be processed is slidably arranged on the sliding rail, and the workpiece mounting rack is driven to slide along the extending direction of the sliding rail.

Optionally, as an implementation manner, a fourth linear driving piece is arranged on the second workpiece frame, and the fourth linear driving piece drives the workpiece frame to do reciprocating linear motion.

Optionally, as an implementation manner, the grinding wheel assembly includes a grinding wheel motor disposed on the mounting plate and a grinding wheel disposed at a driving end of the grinding wheel motor, and the grinding wheel motor drives the grinding wheel to rotate.

Alternatively, as an implementation manner, the mounting plate is provided with an oil injection pipe, and the cooling liquid is injected to the grinding wheel on the mounting plate through the oil injection pipe.

Optionally, as an implementation manner, a workpiece probe is further arranged on the mounting plate, and the workpiece probe is used for detecting the position of the workpiece to be processed.

Alternatively, as an embodiment, the workpiece mounting frame is provided with a workpiece shaft for fixing the workpiece to be processed.

The beneficial effects of the embodiment of the application include:

The application provides a ball head cutter numerical control grinding machine, which comprises a machine body, and a workpiece frame assembly and a grinding wheel frame assembly which are arranged on a mounting surface of the machine body in a sliding way, wherein the workpiece frame assembly comprises a first workpiece frame, a second workpiece frame and a rotary table, the first workpiece frame is arranged on the machine body in a sliding way along an X axis, the rotary table is arranged on the first workpiece frame, the second workpiece frame is arranged on the rotary table, the second workpiece frame is used for mounting a workpiece to be machined, so that the workpiece to be machined on the second workpiece frame can rotate along the rotary table and also can slide along the X axis along the first workpiece frame, the grinding wheel frame assembly comprises a grinding wheel frame which is arranged on the machine body in a sliding way along the Y axis and a mounting plate which is connected with the grinding wheel frame in a sliding way along the Z axis, the mounting plate is provided with the grinding wheel assembly, so that the grinding wheel assembly can slide along the Y axis along the mounting plate, the grinding wheel frame assembly is used for grinding the workpiece to be machined, and the grinding wheel frame can be driven to move towards or away from the workpiece frame assembly, and the grinding precision of the grinding machine is higher through the matching movement of the workpiece frame assembly and the grinding machine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a numerical control grinder for a ball head cutter according to an embodiment of the present application;

FIG. 2 is a second schematic diagram of a numerical control grinder for ball head cutters according to an embodiment of the present application;

fig. 3 is a third schematic structural diagram of a numerical control grinding machine for ball head cutters according to an embodiment of the present application.

The icons are 100-ball head cutter numerically controlled grinder, 110-bed body, 120-workpiece support assembly, 121-first workpiece support, 122-second workpiece support, 1221-slide rail, 1222-workpiece support, 1223-workpiece shaft, 1224-fourth linear driving piece, 123-turntable, 130-grinding carriage assembly, 131-grinding carriage, 132-mounting plate, 133-grinding carriage assembly, 134-oil spray pipe and 135-workpiece probe.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, 2 and 3, the present embodiment provides a ball head cutter numerically controlled grinder 100, including a lathe 110, and a workpiece holder assembly 120 and a grinding wheel holder assembly 130 slidably disposed on a mounting surface of the lathe 110, wherein the workpiece holder assembly 120 includes a first workpiece holder 121, a second workpiece holder 122 and a turntable 123, the first workpiece holder 121 is slidably disposed on the lathe 110 along an X axis, the turntable 123 is disposed on the first workpiece holder 121, the second workpiece holder 122 is disposed on the turntable 123, the second workpiece holder 122 is used for mounting a workpiece to be machined, the grinding wheel holder assembly 130 includes a grinding wheel holder 131 slidably disposed on the lathe 110 along a Y axis, and a mounting plate 132 slidably connected with the grinding wheel holder 131 along a Z axis, the mounting plate 132 is provided with a grinding wheel assembly 133, the grinding wheel assembly 133 is used for grinding the workpiece to be machined, and the grinding wheel holder 131 can be driven to move toward or away from the workpiece holder assembly 120.

Specifically, the turntable 123 is a DD turntable 123, when the ball-end-tool numerically-controlled grinder 100 works, a workpiece to be machined is mounted on the second workpiece frame 122, the first workpiece frame 121 is slidably disposed on the bed body 110 along the X axis, the turntable 123 is disposed on the first workpiece frame 121, the second workpiece frame 122 is disposed on the turntable 123, when the first workpiece frame 121 is driven to slide along the X axis, the workpiece to be machined disposed on the second workpiece frame 122 slides along the X axis along the first workpiece frame 121, and when the turntable 123 drives the second workpiece frame 122 to rotate, the workpiece to be machined disposed on the second workpiece frame 122 rotates along the second workpiece frame 122 by a preset angle. The grinding carriage assembly 130 comprises a grinding carriage 131 arranged on the bed body 110 in a sliding manner along a Y axis and a mounting plate 132 which is connected with the grinding carriage 131 in a sliding manner along a Z axis, wherein the mounting plate 132 is provided with a grinding carriage assembly 133, the mounting plate 132 is driven to slide along the Z axis so that the grinding carriage assembly 133 can slide along the Z axis along the mounting plate 132, the grinding carriage 131 is driven to slide along the Y axis so that the grinding carriage assembly 133 can slide along the Y axis along the grinding carriage 131, and the numerical control module controls the first workpiece carriage 121, the turntable 123, the grinding carriage 131 and the mounting plate 132 to cooperatively move so as to ensure the machining precision of a ball head cutter. The X-axis, Y-axis, and Z-axis are specifically labeled in fig. 1, and the X-axis, Y-axis, and Z-axis are perpendicular to each other.

The application provides a ball head cutter numerically controlled grinder 100, which comprises a lathe 110, and a workpiece frame assembly 120 and a grinding wheel frame assembly 130 which are arranged on the installation surface of the lathe 110 in a sliding way, wherein the workpiece frame assembly 120 comprises a first workpiece frame 121, a second workpiece frame 122 and a turntable 123, the first workpiece frame 121 is arranged on the lathe 110 in a sliding way along the X axis, the turntable 123 is arranged on the first workpiece frame 121, the second workpiece frame 122 is arranged on the turntable 123, the second workpiece frame 122 is used for installing a workpiece to be machined, so that the workpiece to be machined on the second workpiece frame 122 can rotate along the turntable 123 and also can slide along the X axis along with the first workpiece frame 121, the grinding wheel frame assembly 130 comprises a grinding wheel frame 131 which is arranged on the lathe 110 in a sliding way along the Y axis and a mounting plate 132 which is connected with the grinding wheel frame 131 in a sliding way along the Z axis, so that the grinding wheel assembly 133 can slide along the Z axis along the Y axis along the mounting plate 132, the grinding wheel frame 131 is also used for grinding the workpiece to be machined, the grinding wheel assembly 133 can be driven towards or away from the workpiece frame 131, and the grinding wheel frame assembly 120 can move along the Y axis along the X axis, so that the grinding accuracy is higher through the numerical control grinder 100, and the grinding tool assembly is matched with the workpiece assembly 130.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, a first linear driving member is disposed on the bed 110, and the first linear driving member drives the first workpiece rest 121 to reciprocate along the X axis.

Further, a second linear driving member is disposed on the bed 110, and drives the grinding carriage 131 to reciprocate along the Y axis.

The grinding carriage 131 is provided with a third linear driving member, and the third linear driving member drives the mounting plate 132 to perform reciprocating linear motion along the Z axis.

Specifically, when the ball-end tool numerically controlled grinder 100 works, a workpiece to be machined is mounted on the second workpiece holder 122, the first workpiece holder 121 is slidably disposed on the bed body 110 along the X axis, the turntable 123 is disposed on the first workpiece holder 121, the second workpiece holder 122 is disposed on the turntable 123, the first linear driving member drives the first workpiece holder 121 to slide along the X axis, the workpiece to be machined disposed on the second workpiece holder 122 slides along the X axis along the first workpiece holder 121, and when the turntable 123 drives the second workpiece holder 122 to rotate, the workpiece to be machined disposed on the second workpiece holder 122 rotates along the second workpiece holder 122 by a preset angle. The grinding carriage assembly 130 comprises a grinding carriage 131 arranged on the bed body 110 in a sliding manner along the Y axis and a mounting plate 132 which is connected with the grinding carriage 131 in a sliding manner along the Z axis, wherein the mounting plate 132 is provided with a grinding carriage assembly 133, a third linear driving piece drives the mounting plate 132 to slide along the Z axis so that the grinding carriage assembly 133 can slide along the Z axis along the mounting plate 132, a second linear driving piece drives the grinding carriage 131 to slide along the Y axis so that the grinding carriage assembly 133 can slide along the Y axis along the grinding carriage 131, and the numerical control module controls the first workpiece frame 121, the turntable 123, the grinding carriage 131 and the mounting plate 132 to cooperatively move so as to ensure the machining precision of a ball head cutter. The second linear driving member drives the grinding carriage 131 to reciprocate along the Y-axis to move the grinding carriage 131 toward or away from the workpiece holder assembly 120. The first linear driving member drives the first workpiece rest 121 to slide along the X-axis, so that the workpiece to be processed disposed on the second workpiece rest 122 follows the first workpiece rest 121 to slide along the X-axis, so as to adjust the contact position between the workpiece to be processed and the grinding wheel assembly 133.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, a slide rail 1221 is laid on the second workpiece holder 122, and a workpiece mounting rack 1222 for mounting a workpiece to be processed is slidably provided on the slide rail 1221, and the workpiece mounting rack 1222 is driven to slide in the extending direction of the slide rail 1221.

Specifically, when the ball-end tool numerically controlled grinder 100 works, a workpiece to be machined is mounted on the workpiece mounting rack 1222, the first workpiece rack 121 is slidably disposed on the bed body 110 along the X axis, the turntable 123 is disposed on the first workpiece rack 121, the second workpiece rack 122 is disposed on the turntable 123, the first linear driving member drives the first workpiece rack 121 to slide along the X axis, the workpiece to be machined disposed on the second workpiece rack 122 slides along the X axis along the first workpiece rack 121, and when the turntable 123 drives the second workpiece rack 122 to rotate, the workpiece to be machined disposed on the second workpiece rack 122 rotates along the second workpiece rack 122 by a preset angle. The grinding carriage assembly 130 comprises a grinding carriage 131 arranged on the bed body 110 in a sliding manner along the Y axis and a mounting plate 132 which is connected with the grinding carriage 131 in a sliding manner along the Z axis, wherein the mounting plate 132 is provided with a grinding carriage assembly 133, a third linear driving piece drives the mounting plate 132 to slide along the Z axis so that the grinding carriage assembly 133 can slide along the Z axis along the mounting plate 132, a second linear driving piece drives the grinding carriage 131 to slide along the Y axis so that the grinding carriage assembly 133 can slide along the Y axis along the grinding carriage 131, and the numerical control module controls the first workpiece frame 121, the turntable 123, the grinding carriage 131 and the mounting plate 132 to cooperatively move so as to ensure the machining precision of a ball head cutter. The second linear driving member drives the grinding carriage 131 to reciprocate along the Y-axis to move the grinding carriage 131 toward or away from the workpiece holder assembly 120. The first linear driving member drives the first workpiece rest 121 to slide along the X-axis, so that the workpiece to be processed disposed on the second workpiece rest 122 follows the first workpiece rest 121 to slide along the X-axis, so as to adjust the contact position between the workpiece to be processed and the grinding wheel assembly 133. The cutting point of the grinding wheel is unchanged, the workpiece mounting frame 1222 is driven to slide along the extending direction of the sliding rail 1221, and the machining of the ball head cutter can be completed by matching with the rotation of the turntable 123, so that the machining precision of the ball head cutter is ensured.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, a fourth linear driving member 1224 is disposed on the second workpiece holder 122, and the fourth linear driving member 1224 moves the workpiece mounting frame 1222 in a reciprocating linear motion.

Specifically, the first workpiece holder 121, the workpiece mounting rack 1222, the turntable 123, the grinding carriage 131 and the mounting plate 132 are controlled to move cooperatively by the numerical control module, so that the machining precision of the ball head cutter is ensured. The second linear driving member drives the grinding wheel frame 131 to perform reciprocating linear motion along the Y axis, so that the grinding wheel frame 131 moves towards or away from the workpiece frame assembly 120, and then the third linear driving member drives the mounting plate 132 to slide along the Z axis, so that the grinding wheel assembly 133 can slide along the Z axis along with the mounting plate 132, so as to adjust the grinding wheel assembly 133 to a proper position. The first linear driving member drives the first workpiece rest 121 to slide along the X-axis, so that the workpiece to be processed disposed on the second workpiece rest 122 follows the first workpiece rest 121 to slide along the X-axis, so as to adjust the contact position between the workpiece to be processed and the grinding wheel assembly 133. The cutting point of the grinding wheel is unchanged, the fourth linear driving piece 1224 drives the workpiece mounting rack 1222 to slide along the extending direction of the sliding rail 1221, and the complex curved surface processing of the ball head cutter can be completed by matching with the rotation of the turntable 123, so that the processing precision of the ball head cutter is ensured.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, the grinding wheel assembly 133 includes a grinding wheel motor provided on the mounting plate 132 and a grinding wheel provided at a driving end of the grinding wheel motor, the grinding wheel motor driving the grinding wheel to rotate.

Specifically, the first workpiece holder 121, the workpiece mounting rack 1222, the turntable 123, the grinding carriage 131 and the mounting plate 132 are controlled to move cooperatively by the numerical control module, so that the machining precision of the ball head cutter is ensured. The second linear driving piece drives the grinding wheel frame 131 to do reciprocating linear motion along the Y axis so as to enable the grinding wheel frame 131 to move towards or away from the workpiece frame assembly 120, then the third linear driving piece drives the mounting plate 132 to slide along the Z axis so that the grinding wheel assembly 133 can slide along the Z axis along the mounting plate 132, the grinding wheel assembly 133 is adjusted to a proper position, and then the grinding wheel motor is started to drive the grinding wheel to rotate so as to grind the ball head cutter by the grinding wheel assembly 133.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, an oil spray pipe 134 is provided on the mounting plate 132, and the cooling liquid is sprayed through the oil spray pipe 134 to the grinding wheel on the mounting plate 132.

Specifically, the first workpiece holder 121, the workpiece mounting rack 1222, the turntable 123, the grinding carriage 131 and the mounting plate 132 are controlled to move cooperatively by the numerical control module, so that the machining precision of the ball head cutter is ensured. The second linear driving piece drives the grinding carriage 131 to do reciprocating linear motion along the Y axis so as to enable the grinding carriage 131 to move towards or away from the workpiece frame assembly 120, then the third linear driving piece drives the mounting plate 132 to slide along the Z axis so that the grinding wheel assembly 133 can slide along the Z axis along the mounting plate 132, so that the grinding wheel assembly 133 is adjusted to a proper position, then the grinding wheel motor is started to drive the grinding wheel to rotate, meanwhile, cooling liquid is sprayed to the grinding wheel on the mounting plate 132 through the oil spraying pipe 134 so as to cool a grinding point, burn and other conditions are prevented in the cutter machining process, and grinding of the ball head cutter by the grinding wheel assembly 133 is realized.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, a workpiece probe 135 is further provided on the mounting plate 132, the workpiece probe 135 being used to detect the position of a workpiece to be processed.

Specifically, the second linear driving member drives the grinding carriage 131 to make a reciprocating linear motion along the Y axis, so that the grinding carriage 131 moves towards or away from the workpiece holder assembly 120, then the third linear driving member drives the mounting plate 132 to slide along the Z axis, so that the grinding wheel assembly 133 can slide along the Z axis along with the mounting plate 132, so that the position of a workpiece to be processed is adjusted to a proper position through the workpiece probe 135 on the mounting plate 132, and then the grinding wheel motor is started to drive the grinding wheel to rotate, so that grinding of the grinding wheel assembly 133 on the ball head cutter is realized.

In one possible embodiment of the present application, as shown in fig. 1, 2 and 3, a workpiece shaft 1223 is provided on the workpiece mount 1222, the workpiece shaft 1223 being used to secure a workpiece to be processed.

Specifically, when the workpiece to be processed is fixed, the workpiece to be processed is fixed on the workpiece shaft 1223, so that the workpiece shaft 1223 drives the workpiece to be processed to rotate, and the grinding wheel motor drives the grinding wheel to rotate, so that grinding processing of the ball head cutter by the grinding wheel assembly 133 is realized through relative rotation of the grinding wheel and the workpiece to be processed.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a bulb cutter numerically controlled grinder, its characterized in that includes the lathe body and be in work rest subassembly and the grinding carriage subassembly of sliding setting on the installation face of lathe body, the work rest subassembly includes first work rest, second work rest and revolving stage, first work rest slides along the X axle and sets up on the lathe body, the revolving stage sets up on the first work rest, the second work rest sets up on the revolving stage, the second work rest is used for installing the work piece of waiting to process, the grinding carriage subassembly include along Y axle slip setting on the lathe body and with the mounting panel of grinding carriage along Z axle sliding connection, be provided with the grinding wheel subassembly on the mounting panel, the grinding wheel subassembly is used for waiting to process the work piece, the grinding carriage can be driven towards be close to or keep away from the work rest subassembly motion.

2. The numerical control grinder for ball head cutters according to claim 1, wherein a first linear driving member is provided on the bed body, and the first linear driving member drives the first workpiece holder to reciprocate along the X axis.

3. The numerical control grinding machine for ball cutters according to claim 1, wherein a second linear driving member is arranged on the machine body, and the second linear driving member drives the grinding carriage to do reciprocating linear motion along the Y axis.

4. The numerical control grinding machine for ball cutters according to claim 1, wherein a third linear driving member is arranged on the grinding carriage, and the third linear driving member drives the mounting plate to do reciprocating linear motion along the Z axis.

5. The numerical control grinding machine for ball cutters according to claim 1, characterized in that a slide rail is laid on the second workpiece holder, a workpiece mounting rack for mounting a workpiece to be machined is slidably provided on the slide rail, and the workpiece mounting rack is driven to slide along the extending direction of the slide rail.

6. The numerical control grinding machine for ball cutters according to claim 5, wherein a fourth linear driving member is provided on the second workpiece holder, and the fourth linear driving member drives the workpiece holder to reciprocate linearly.

7. The ball head cutter numerically controlled grinder of claim 1, wherein the grinding wheel assembly comprises a grinding wheel motor disposed on the mounting plate and a grinding wheel disposed at a drive end of the grinding wheel motor, the grinding wheel motor driving the grinding wheel to rotate.

8. The ball nose cutter numerically controlled grinder of claim 7, wherein the mounting plate is provided with a spray bar through which coolant is sprayed to a grinding wheel on the mounting plate.

9. The ball nose cutter numerically controlled grinder of claim 8, wherein a workpiece probe is further provided on the mounting plate for detecting the position of the workpiece to be machined.

10. The ball nose cutter numerically controlled grinder of claim 5, wherein the workpiece mount is provided with a workpiece shaft for securing a workpiece to be machined.