JP5428260B2 - Machine tool with provisional cradle - Google Patents

Description

  The present invention relates to a machine tool including a temporary support for temporarily supporting a workpiece before and after supporting the workpiece on a spindle stock and a tailstock.

2. Description of the Related Art Conventionally, a machine tool provided with a provisional pedestal is, for example, described in JP-A-9-123039. The provisional pedestal described in Patent Document 1 includes a weight receiving portion that supports a weight portion of a workpiece and a journal receiving portion that supports a journal portion of the workpiece.
Japanese Patent Laid-Open No. 9-123039 (FIG. 1, [0013])

  However, when the provisional pedestal described in Patent Document 1 is applied, the provisional cradle must be replaced every time the workpiece is different. That is, every time the workpiece is changed, it is necessary to manually change the provisional table. In this case, there is a problem that a large number of man-hours are required when processing various kinds of workpieces.

  The present invention has been made in view of such circumstances, and even if a workpiece is changed, a machine including a temporary holder that can easily cope with various kinds of workpieces without changing the temporary holder. The purpose is to provide a machine.

In order to solve the above-described problem, the feature of the invention of the machine tool including the temporary support table according to claim 1 is:
A pedestal,
A headstock that is provided on the pedestal and rotatably supports one end side of the workpiece;
A tailstock on the pedestal and provided at a position facing the headstock, and rotatably supporting the other end of the workpiece;
Provided between the headstock and the tailstock, fixed to the pedestal so as to be immovable in the axial direction of the workpiece, and temporarily before and after supporting the workpiece on the spindle stock and the tailstock A first temporary support for supporting the workpiece;
Before and after supporting the workpiece on the headstock and the tailstock, provided between the headstock and the tailstock, provided to be movable in the axial direction of the workpiece with respect to the base. A second temporary support for temporarily supporting the workpiece;
It is to provide.

The feature of the invention according to claim 2 is that in claim 1,
The spindle stock and the tailstock are provided to be movable with respect to the pedestal.

A feature of the invention according to claim 3 is that in claim 1 or 2,
The second temporary cradle is
A temporary support base fixed to the base;
A movable part that can be positioned at two locations in the separating direction of the spindle stock and the tailstock with respect to the temporary support base by a cylinder mechanism;
A temporary support portion fixed to the movable portion and temporarily supporting the workpiece;
It is to provide.

The invention according to claim 4 is characterized in that in claim 1 or 2,
The first temporary holder and the second temporary holder are
A temporary cradle body provided on the pedestal;
A second cylinder member provided on the temporary cradle body, wherein the movable end portion is movable relative to the temporary cradle body in a direction that does not intersect with and is not parallel to the axial direction of the workpiece;
A swinging member that is swingably supported by the temporary cradle body and swingably supported by the movable end of the second cylinder member;
A provisional portion provided on the swinging member, temporarily supporting the workpiece, and changing a distance from a central axis of the workpiece according to an operation of the second cylinder member;
It is to provide.

  According to the invention of the machine tool provided with the temporary holder according to claim 1 configured as described above, the first temporary holder and the second temporary holder are provided. The first temporary support is fixed so as not to move with respect to the pedestal, and the second temporary support is provided so as to be movable with respect to the pedestal. Thus, the separation distance between the first temporary holder and the second temporary holder can be changed by making the second temporary holder movable relative to the base. That is, by moving the second temporary holder, it is possible to easily cope with various kinds of workpieces without changing the setting of the temporary holder.

  Here, in the present invention, since the first temporary holder is fixed to the pedestal, the workpiece is positioned with reference to the first temporary holder. Furthermore, the support rigidity of the workpiece by the first temporary support can be increased by fixing the first temporary support to the base so as not to move. In this way, the workpiece can be stably and temporarily supported by temporarily supporting the workpiece by the fixed first provisional cradle.

  By the way, when the headstock and the tailstock for supporting the workpiece are directly provided on the bed, the pedestal of the present invention is a bed. In this case, the first temporary holder is fixed to the bed, and the second temporary holder is movable with respect to the bed. Further, when the headstock and the tailstock are provided on the table, the pedestal becomes a table. That is, when a table movable with respect to the bed is provided, the pedestal becomes the table. In this case, the first temporary holder is fixed to the table, and the second temporary holder is movable with respect to the table.

According to the invention of claim 2, the present invention is also applicable to a workpiece for which the separation distance between the first temporary holder and the headstock and the separation distance between the first temporary holder and the tailstock are to be changed. It becomes possible. Thereby, flexibility can be further provided.
According to the invention which concerns on Claim 3, since the operation mechanism of a 2nd temporary support stand is a simple structure which uses a cylinder mechanism, it can be made cheap.
According to the invention which concerns on Claim 4, the radial direction position of the workpiece by a temporary support stand can be changed by operating the 2nd cylinder member. That is, it is possible to easily cope with various workpieces having different outer diameters.

  Hereinafter, an embodiment in which a machine tool including a provisional cradle according to the present invention is embodied will be described with reference to the drawings. As a machine tool of the present invention, a grinding machine will be described as an example in the present embodiment. In addition, if the machine tool of this invention is a machine tool provided with a temporary support stand, it can apply also to a lathe provided with a temporary support stand other than a grinding machine, for example.

  The overall configuration of the grinding machine 1 of the present embodiment will be described with reference to FIG. FIG. 1 is a plan view of the grinding machine 1. As shown in FIG. 1, the grinding machine 1 includes a bed 10, a headstock 20, a tailstock 30, a grindstone support device 40, a temporary support device 50, and a control device (not shown). The

  The bed 10 has a substantially rectangular shape and is disposed on the floor. On the upper surface of the bed 10, a pair of grindstone guide rails 11 are formed in parallel to each other so as to extend in the left-right direction (Z-axis direction) in FIG. 1. The pair of wheel head guide rails 11 are rails on which a wheel head traverse base 41 constituting the wheel support device 40 can slide. Further, a pair of first guide rails 12 on which the headstock 20 is slidable on the lower side (front side of the machine) of FIG. 1 are formed in parallel to each other so as to extend in the left-right direction (Z-axis direction). A pair of second guide rails 13 on which the tailstock 30 is slidable on the right side in FIG. 1 from the pair of first guide rails 12 on the upper surface of the bed 10 are the left and right directions (Z-axis in FIG. 1). Direction) and parallel to each other.

  The bed 10 is provided with a grinding wheel base Z-axis ball screw 14 for driving the grinding wheel base traverse base 41 in the left-right direction in FIG. 1 between the pair of grinding wheel base guide rails 11. A grinding wheel base Z-axis motor 15 for rotating the base Z-axis ball screw 14 is disposed. Further, the bed 10 is provided with a first Z-axis ball screw 16 between the pair of first guide rails 12 for driving the headstock 20 in the left-right direction in FIG. A first Z-axis motor 17 that rotationally drives the screw 16 is disposed. The bed 10 is provided with a second Z-axis ball screw 18 between the pair of second guide rails 13 for driving the tailstock 30 in the left-right direction in FIG. A second Z-axis motor 19 that rotationally drives 18 is disposed.

  The head stock 20 includes a head stock main body 21, a main shaft 22, and a main shaft chuck 23. The headstock body 21 is slidably disposed on the pair of first guide rails 12 in the upper surface of the bed 10. The headstock main body 21 is connected to the nut member of the first Z-axis ball screw 16 and moves along the pair of first guide rails 12 by driving the first Z-axis motor 17. Inside the headstock main body 21, a main shaft 22 is inserted and supported so as to be rotatable about the axis (around the Z axis in FIG. 1). The main shaft 22 is rotationally driven by a motor (not shown). A spindle chuck 23 that holds one axial end of the long workpiece W is attached to the right end of the spindle 22.

  The tailstock 30 includes a tailstock body 31 and a tailstock center 32. The tailstock body 31 is slidably disposed on the pair of second guide rails 13 in the upper surface of the bed 10. The tailstock main body 31 is connected to the nut member of the second Z-axis ball screw 18 and moves along the pair of second guide rails 13 by the drive of the second Z-axis motor 19. The tailstock main body 31 is formed with a hole penetrating in the left-right direction in FIG. A tailstock center 32 is rotatably inserted and supported in the through hole of the tailstock main body 31. The rotating shaft of the tailstock center 32 is located coaxially with the rotating shaft of the main shaft 22. The tailstock center 32 supports the other axial end of the workpiece W. That is, the tailstock center 32 is disposed so as to face the spindle chuck 23. The spindle chuck 23 and the tailstock center 32 support both ends of the workpiece W. Thus, the workpiece W is held by the spindle chuck 23 and the tailstock center 32 so as to be rotatable around the spindle axis (around the Z axis).

  The grinding wheel support device 40 includes a grinding wheel base traverse base 41, a grinding wheel base 42, a grinding wheel 43, and a grinding wheel rotation motor 44. The grinding wheel base traverse base 41 is formed in a rectangular flat plate shape, and is slidably disposed on the pair of grinding wheel head guide rails 11 on the upper surface of the bed 10. The wheel head traverse base 41 is connected to a nut member of the wheel head Z-axis ball screw 14, and moves along the pair of wheel head guide rails 11 by driving the wheel head Z-axis motor 15. A pair of X-axis guide rails 41a on which the grinding wheel table 42 can slide are formed on the upper surface of the grinding wheel table traverse base 41 so as to extend in the vertical direction (X-axis direction) in FIG. Has been. Further, the wheel head traverse base 41 is provided with an X axis ball screw 41b for driving the wheel head 42 in the vertical direction in FIG. 1 between the pair of X axis guide rails 41a. An X-axis motor 41c that rotationally drives 41b is disposed.

  The grinding wheel base 42 is slidably disposed on the pair of X-axis guide rails 41 a in the upper surface of the grinding wheel base traverse base 41. The grinding wheel base 42 is connected to the nut member of the X-axis ball screw 41b, and moves along the pair of X-axis guide rails 41a by driving the X-axis motor 41c. That is, the grindstone base 42 can move relative to the bed 10, the spindle stock 20 and the tailstock 30 in the X-axis direction and the Z-axis direction (traverse feed direction).

  A hole penetrating in the left-right direction in FIG. 1 is formed in the lower portion of FIG. A grinding wheel rotating shaft member (not shown) is supported in the through hole of the grinding wheel base 42 so as to be rotatable around the grinding wheel central axis (around the Z axis). A grinding wheel 43 is coaxially attached to one end (left end in FIG. 1) of the grinding wheel rotating shaft member. A grinding wheel rotating motor 44 is fixed on the upper surface of the grinding wheel base 42. A pulley is suspended between the other end of the grinding wheel rotating shaft member (the right end in FIG. 1) and the rotating shaft of the grinding wheel rotating motor 44, so that the grinding wheel 43 is driven by the driving of the grinding wheel rotating motor 44. Rotate around.

  The temporary receiving table device 50 includes a seat plate 51, a first temporary receiving table 52, and a second temporary receiving table 53. The seat plate 51 is fixed between the first guide rail 12 and the second guide rail 13 on the bed 10. The seat plate 51 has a rectangular shape, and is provided such that the longitudinal direction thereof coincides with the left-right direction in FIG. In other words, the seat plate 51 is an area where the headstock 20 and the tailstock 30 are opposed to each other, and is provided below the mounting position of the workpiece W (on the floor surface side). Further, the seat plate 51 is provided on the lower side of the main shaft 22 and the rotating shaft of the tailstock center 32 in FIG. That is, the seat plate 51 is located on the side opposite to the grinding wheel 43 when the workpiece W is used as a reference. Here, the base of the present invention corresponds to the bed and the seat plate 51 in the present embodiment.

  The first and second temporary holders 52 and 53 are provided on the seat plate 51. That is, the first and second temporary holders 52 and 53 are provided between the headstock 20 and the tailstock 30. Guide protrusions are formed on the upper surface of the seat plate 51. Then, the first and second provisional pedestals 52 and 53 temporarily support the workpiece W before and after supporting the workpiece W on the spindle stock 20 and the tailstock 30. That is, the first and second temporary supports 52 and 53 are configured so that the workpiece W before being processed by the robot or the loader is supported by the spindle table 20 and the tailstock 30 before the workpiece W is supported. Is temporarily supported. Further, the first and second provisional pedestals 52 and 53 are used for unloading the processed workpiece W supported by the headstock 20 and the tailstock 30 with a robot or a loader. The object W is temporarily supported.

  The first temporary support 52 is fixed on the seat plate 51 so as not to move. On the other hand, the second temporary support base 53 is provided on the seat plate 51 so as to be movable in the Z-axis direction. The first temporary holder 52 is provided between the second temporary holder 53 and the tailstock 30. In other words, the first temporary holder 52 is provided on the side farther from the headstock 20 than the second temporary holder 53. The detailed configuration of the first and second temporary holders 52 and 53 will be described later.

  The control device performs NC control on the rotation of the spindle 22 and the X-axis position and the Z-axis position of the grindstone table 42. That is, the outer peripheral surface of the workpiece W is ground by controlling the X-axis position and the Z-axis position of the grinding wheel 43 with respect to the workpiece W while the grinding wheel 43 is rotated by the control device.

  Next, a detailed configuration of the second temporary support base 53 will be described with reference to FIGS. The detailed configuration of the first temporary holder 52 will be described after the description of the second temporary holder 53. FIG. 2 is a plan view of the second temporary holder 53. 3 is a view in the direction of arrow A in FIG. 4 is a view in the direction of arrow B in FIG. FIG. 5 is a view in the direction of arrow C in FIG. 6 is a cross-sectional view taken along the line DD of FIG. 7 is a cross-sectional view taken along line EE in FIG. 8 is a cross-sectional view taken along line FF in FIG. 9 is a cross-sectional view taken along the line GG in FIG.

  The second temporary holder 53 includes a second temporary holder main body 60, a diameter adjusting cylinder member 70, a swing member 80, and a temporary holder 90. The second temporary support base body 60 is provided on the seat plate 51. The second temporary holder main body 60 includes a second temporary holder base 61, a guide part 62, a movable part 63, and a cylinder member 64. The second temporary support base 61 has a configuration in which the movable portion 63 can be moved in the Z-axis direction (the direction in which the spindle base 20 and the tailstock 30 are separated) with respect to the second temporary support base 61. is there.

  The second provisional pedestal base 61 has a substantially rectangular shape and is fixed to the guide convex portion of the seat plate 51. The second temporary support base 61 has two through holes 61a and 61b. These through holes 61a and 61b are formed so as to extend in the Z-axis direction and in parallel to each other.

  The guide part 62 has a cylindrical shape, is inserted into one through hole 61a of the second temporary support base part 61, and is movable in the axial direction of the through hole 61a with respect to the second temporary support base part 61. It is supported to become. The movable part 63 is fixed to one end of the guide part 62. The movable part 63 operates integrally with the guide part 62. That is, the movable part 63 is provided so as to be movable in the Z-axis direction with respect to the second provisional pedestal base part 61 in accordance with the operation of the guide part 62. On the upper surface of the movable portion 63, a fulcrum support portion 63a serving as a swing center of the swing member 80 is provided.

  The cylinder member 64 has a substantially cylindrical shape as a whole, and has a sliding portion 64 a that can slide through the through-hole 61 b of the second temporary support base 61. One end side of the cylinder member 64 is fixed to the movable portion 63. The axial direction of the cylinder member 64 is provided so as to coincide with the axial direction of the guide member 62. Here, the inside of the through hole 61b of the second temporary support base 61 is sealed with driving oil, and is divided into two chambers by the sliding portion 64a. That is, the cylinder mechanism is formed by the cylinder member 64 and the through hole 61 b of the second temporary receiving base base 61.

  The hydraulic pressure in the right side region of the sliding portion 64a in FIGS. 7 and 9 (hereinafter referred to as “the tailstock side region”) is changed to the left side region in the sliding portion 64a in FIGS. 7 and 9 (hereinafter referred to as “the headstock side”). When the hydraulic pressure of the sliding portion 64a becomes larger than the hydraulic pressure of the region, the sliding portion 64a moves with respect to the second temporary support base 61 so that the volume of the tailstock side region of the sliding portion 64a increases. That is, the movable part 63 moves to the headstock 20 side with respect to the second temporary support base 61. At this time, the position where the movable portion 63 is positioned with respect to the second provisional pedestal base 61 is determined by the contact between the sliding portion 64a and the lid portion that closes one of the through holes 61b. The lid portion that closes one of the through holes 61b is a member that is provided in an opening portion of the through hole 61b on the head stock 20 side and that can adjust the positioning portion of the movable portion 63 on the head stock 20 side. That is, the lid portion serves as a stopper on the head stock 20 side with respect to the second temporary support base portion 61 of the movable portion 63.

  Conversely, when the hydraulic pressure in the tailstock side region of the sliding portion 64a is smaller than the hydraulic pressure in the headstock side region of the sliding portion 64a, the volume of the tailstock side region of the sliding portion 64a is reduced. The sliding part 64a moves relative to the second temporary receiving base part 61. That is, the movable part 63 moves to the tailstock 30 side with respect to the second temporary support base 61. At this time, the positioning part of the movable part 63 with respect to the second temporary support base 61 is determined by the contact between the sliding part 64a and the lid part that closes the other of the through hole 61b. The lid that closes the other of the through holes 61b is a member that is provided in the opening of the through hole 61b on the side of the tailstock 30 and that can adjust the position of the movable part 63 on the side of the tailstock 30. That is, the lid portion has a role of a stopper on the tailstock 30 side with respect to the second temporary support base portion 61 of the movable portion 63.

  The diameter adjusting cylinder member 70 (corresponding to the “second cylinder member” of the present invention) is provided in the movable portion 63 of the second temporary support body 60 and is driven by hydraulic pressure or air pressure. The movable end portion of the diameter adjusting cylinder member 70 is movable in the vertical direction of FIG. Furthermore, the diameter adjusting cylinder member 70 is provided at a position shifted from the axis of the workpiece W in the horizontal direction, as shown in FIGS. In other words, the diameter adjusting cylinder member 70 can move in a direction that does not intersect the axis direction of the workpiece W and is not parallel thereto.

  The swing member 80 is swingably supported by the fulcrum support portion 63a of the movable portion 63 of the second temporary cradle body 60. More specifically, the swing member 80 is swingably supported by the fulcrum support portion 63a between the workpiece W and the diameter adjusting cylinder member 70. Furthermore, one end of the swing member 80 is swingably supported by the movable end of the diameter adjusting cylinder member 70. That is, the swing member 80 swings around the normal axis in FIG. 4 around the fulcrum support portion 63a as the diameter adjusting cylinder member 70 moves relative to the movable portion 63.

  The provisional receiving portion 90 is fixed to the other end of the swing member 80, and a V-shaped groove is formed on the upper surface side thereof. The V-shaped groove of the temporary receiving portion 90 is a portion that temporarily supports the workpiece W. Further, since the temporary receiving portion 90 is fixed to the other end of the swinging member 80, the V-shaped groove of the temporary receiving portion 90 is accompanied by the movement of the diameter adjusting cylinder member 70 with respect to the movable portion 63. The distance from the central axis of the workpiece W at the position changes.

  Next, a detailed configuration of the first temporary holder 52 will be described with reference to FIGS. 10 and 11. FIG. 10 is a plan view of the first temporary holder 52. FIG. 11 is a view taken in the direction of the arrow H in FIG. Except for a mechanism that moves in the Z-axis direction with respect to the seat plate 51 in the second temporary support base 53, the first temporary support base 52 has substantially the same configuration. That is, the first temporary holder 52 corresponds to a configuration in which the movable portion 63 of the temporary holder main body 60 of the second temporary holder 53 is fixed to the seat plate 51.

  As shown in FIGS. 10 and 11, the first temporary holder 52 includes a first temporary holder main body 100, a diameter adjusting cylinder member 70, a swing member 80, and a temporary receiver 90. . The first temporary cradle body 100 is fixed on the seat plate 51 so as not to move. The first temporary holder main body 100 corresponds to a second temporary holder base 61 and a movable part 63 that are integrally formed. In addition, the diameter adjusting cylinder member 70, the swinging member 80, and the temporary receiving portion 90 in the first temporary support 52 are the same as the diameter adjusting cylinder member 70, the swinging member 80, and the temporary support in the second temporary receiving base 52. Since it is the same structure as the part 90, detailed description is abbreviate | omitted.

  According to the grinding machine 1 having the configuration described above, the following effects are obtained. The grinding machine 1 according to the present embodiment includes a first temporary holder 52 and a second temporary holder 53. The first temporary holder 52 is fixed so as not to move with respect to the bed 10, and the second temporary holder 53 is provided so as to be movable with respect to the bed 10. Thus, by making the second temporary support base 53 movable relative to the bed 10, the distance between the first temporary support base 52 and the second temporary support base 53 can be changed. That is, by moving the second temporary holder 53, it is possible to easily cope with various workpieces W without changing the setting of the temporary holder.

  Further, by fixing the first temporary holder 52 so as not to move relative to the bed 10, it is possible to increase the support rigidity of the workpiece W by the first temporary holder 52. In this way, by temporarily supporting the workpiece W by the fixed first temporary support 52, the workpiece W can be stably and temporarily supported.

  Further, the grinding machine 1 is configured so that the headstock 20 and the tailstock 30 can be moved with respect to the bed 10. Thereby, the separation distance between the first temporary holder 52 and the headstock 20 and the separation distance between the first temporary holder 52 and the tailstock 30 can be applied to the workpiece W to be changed. . That is, the second temporary holder 53, the spindle stock 20, and the tailstock 30 are moved with the first temporary holder 52 as a reference. Thereby, flexibility can be further provided.

  Moreover, since the operation mechanism with respect to the seat plate 51 of the second temporary support base 53 is a simple configuration using a cylinder mechanism, it can be made inexpensive. Furthermore, by operating the diameter adjusting cylinder member 70, the radial position of the workpiece W by the first and second provisional pedestals 52 and 53 can be changed. That is, it is possible to easily cope with various workpieces W having different outer diameters.

<Others>
In the above embodiment, the spindle chuck 23 is provided, but it can be replaced with a spindle center. In addition, although two provisional pedestals are provided, three or more provisional pedestals may be provided. In this case, there may be a plurality of first provisional bases 52, a plurality of second provisional bases 53, or a plurality of both.

1 is a plan view of a grinding machine 1. FIG. It is a top view of the 2nd temporary support stand 53. FIG. It is an A direction arrow directional view of FIG. It is a B direction arrow line view of FIG. It is a C direction arrow directional view of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is GG sectional drawing of FIG. FIG. 6 is a plan view of a first provisional cradle 52. It is a H direction arrow line view of FIG.

Explanation of symbols

1: Grinding machine 10: Bed 20: Headstock, 21: Main body, 22: Main spindle, 23: Main spindle chuck, 30: Tailstock, 31: Tailstock body, 32: Tailstock center, 41: Grinding head traverse base 42: Grinding wheel base 43: Grinding wheel 44: Grinding wheel rotation motor 50: Temporary cradle device 51: Seat plate 52: First temporary cradle 53: Second temporary cradle 61: Second Temporary pedestal base part, 61a, 61b: Through hole 62: Guide part, 63: Movable part, 63a: Support point support part 64: Cylinder member, 64a: Sliding part 100: First temporary cradle body W: Workpiece

Claims (4)

A pedestal,
A headstock that is provided on the pedestal and rotatably supports one end side of the workpiece;
A tailstock on the pedestal and provided at a position facing the headstock, and rotatably supporting the other end of the workpiece;
Provided between the headstock and the tailstock, fixed to the pedestal so as to be immovable in the axial direction of the workpiece, and temporarily before and after supporting the workpiece on the spindle stock and the tailstock A first temporary support for supporting the workpiece;
Before and after supporting the workpiece on the headstock and the tailstock, provided between the headstock and the tailstock, provided to be movable in the axial direction of the workpiece with respect to the base. A second temporary support for temporarily supporting the workpiece;
A machine tool comprising a temporary cradle characterized by comprising: In claim 1,
The machine tool provided with a temporary holder, wherein the headstock and the tailstock are provided to be movable with respect to the pedestal. In claim 1 or 2,
The second temporary cradle is
A temporary support base fixed to the base;
A movable part that can be positioned at two locations in the separating direction of the spindle stock and the tailstock with respect to the temporary support base by a cylinder mechanism;
A temporary support portion fixed to the movable portion and temporarily supporting the workpiece;
A machine tool comprising a temporary cradle characterized by comprising: In claim 1 or 2,
The first temporary holder and the second temporary holder are
A temporary cradle body provided on the pedestal;
A second cylinder member provided on the temporary cradle body, wherein the movable end portion is movable relative to the temporary cradle body in a direction that does not intersect with and is not parallel to the axial direction of the workpiece;
A swinging member that is swingably supported by the temporary cradle body and swingably supported by the movable end of the second cylinder member;
A provisional portion provided on the swinging member, temporarily supporting the workpiece, and changing a distance from a central axis of the workpiece according to an operation of the second cylinder member;
A machine tool comprising a temporary cradle characterized by comprising:

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