JP7552272B2 - How to adjust your bed - Google Patents

Description

This disclosure relates to a method for adjusting a bed.

Patent document 1 discloses a method for supporting the machine body on the floor using leveling blocks, jacks, etc.

Japanese Patent Application Publication No. 02-218530

However, as beds for mounting various devices required for processing become larger, increasing the number of leveling blocks and jacks that support the bed increases the amount of labor required for adjustments when installing or relocating. In addition, which of the many jacks to adjust and to what extent is dependent on the worker. Therefore, it has not been easy to facilitate adjustments when installing or relocating machine tools and beds, reduce labor, and improve the accuracy of the bed's horizontal level, and ultimately improve processing accuracy. The method of Patent Document 1, which provides a floating support means, was not sufficient to achieve the high accuracy required of such processing machines.

This disclosure can be realized in the following forms:

(1) According to one embodiment of the present disclosure, there is provided a method for adjusting a bed having a first bed part having a rectangular parallelepiped shape and a second bed part arranged in the middle of the first bed part in the longitudinal direction. This method for adjusting the bed includes the steps of supporting the bed using at least three leveling blocks arranged along the longitudinal direction of the first bed part at the lower part of the first bed part and at least one leveling block arranged at the lower part of the second bed part, adjusting the bed to be horizontal using the leveling blocks, machining a pair of guide surfaces provided on the upper surface of the first bed part to be horizontal, arranging a device on the guide surfaces, measuring the amount of rolling caused in the bed by arranging the device on the guide surfaces by a rolling measuring device in correspondence with the position of the bed, and correcting the inclination of the guide surfaces after the device is arranged using a plurality of jacks arranged on the lower outer periphery of the first bed part and the lower outer periphery of the second bed part according to the amount of rolling.
In another embodiment of the present disclosure, a method for adjusting a bed having a first bed part having a rectangular parallelepiped shape and a second bed part arranged in the middle of the first bed part in the longitudinal direction is provided. This method for adjusting the bed includes the steps of supporting the bed using at least three leveling blocks arranged along the longitudinal direction of the first bed part and at least one leveling block arranged in the lower part of the second bed part, adjusting the bed to be horizontal using the leveling blocks, machining a pair of guide surfaces provided on the upper surface of the first bed part to be horizontal, placing an apparatus on the guide surfaces, and correcting the inclination of the guide surfaces after the apparatus is placed using a plurality of jacks arranged in the lower outer periphery of the first bed part and the lower outer periphery of the second bed part, and further includes the step of receiving a machining load of the guide surfaces using the plurality of jacks before performing the step of machining the guide surfaces to be horizontal .
According to these types of bed adjustment methods, the bed is leveled using four leveling blocks, and then the guide surface is machined, so that the guide surface can be easily machined to be horizontal.
(2) In the bed adjustment method of the above aspect, in the step of adjusting the bed so that it is level, a level gauge may be placed at positions on the bed corresponding to the four leveling blocks, and the plurality of leveling blocks may be adjusted so that the level gauge indicates the level. According to the bed adjustment method of this aspect, it is easy to determine whether the bed is level by the level gauge.
(3) In the bed adjustment method of the above aspect, before executing the step of machining the guide surface horizontally, a step of receiving a machining load of the guide surface by using a plurality of the jacks. According to the bed adjustment method of this aspect, it is possible to avoid the influence of the machining load when machining the guide surface.
(4) The present disclosure may be realized in various forms other than a bed adjustment method. For example, the present disclosure may be realized in the form of a leveling block adjustment method, a bed support method, etc.

FIG. 2 is a plan view of the machine tool without any devices mounted thereon. FIG. 2 is an explanatory diagram illustrating a schematic view of a machine tool on which various devices are mounted. FIG. 2 is an explanatory diagram showing various devices and workpieces on a table in a plan view. FIG. 2 is a plan view showing a first bed portion, a second bed portion, and a second table of the machine tool. FIG. 2 is a perspective view showing a first bed portion, a second bed portion, and a second table of the machine tool. 1 is a diagram showing a frame and a guide surface of a bed used in a machine tool, as viewed from the floor surface side. FIG. 4 is an explanatory diagram showing a configuration of a guide surface. FIG. 2 is an explanatory diagram showing a configuration of a leveling block. FIG. 2 is an explanatory diagram showing the configuration of a jack. FIG. 11 is a process diagram showing a bed adjustment procedure.

Figure 1 is a plan view of a machine tool (grinding machine) 100 in a state where various devices are not placed on a bed long in the z direction. Figure 2 is an explanatory diagram that shows the state of the machine tool 100 in a state where various devices are placed. Figure 3 is an explanatory diagram showing various devices and a workpiece 200 on a table 70 in a plan view. Figure 4 is a plan view showing the first bed portion 20, the second bed portion 30, and the guide table 75 of the machine tool 100. Figure 5 is a perspective view showing the first bed portion 20, the second bed portion 30, and the guide table 75 of the machine tool 100. When installing the machine tool 100, first the first bed portion 20 and the second bed portion 30 are installed and their horizontal levels are adjusted, and then various processing equipment is mounted on the bed. First, the overall configuration of the processing device 100 will be explained, and the adjustment of the bed at that time will be explained in detail later.

The machine tool 100 comprises a first bed section 20, a second bed section 30, a table 70, a guide table 75, a headstock 80, a tailstock 82, and a grinding wheel table 90. The first bed section 20 has an elongated rectangular parallelepiped shape. The longitudinal direction of the first bed section 20 is called the z direction, the vertical direction is called the y direction, and the direction intersecting the z direction and the y direction is called the x direction. On the upper surface of the first bed section, guide surfaces 61 and 62 having a rail shape are arranged along the z direction. A table 70 is placed on the guide surfaces 61 and 62. The table 70 is arranged so as to be movable in the z direction along the guide surfaces 61 and 62 on the first bed section 20.

A pair of guide surfaces 71 and 72 are arranged on the table 70 along the z direction. Various devices are arranged on the guide surfaces 71 and 72. As shown in FIG. 3, the various devices include a headstock 80, a tailstock 82, and rest devices 84 and 87. The headstock 80 and the tailstock 82 each have centers 81 and 83, and support the workpiece 200 by pushing the workpiece 200 using the centers 81 and 83 from a direction along the axis O1 of the workpiece 200. The workpiece 200 has a roll portion 200a and journal portions 200b on both end sides of the roll portion 200a. The rest device 84 has two shoes 85 and 86 that contact the bottom and side surfaces of the workpiece 200 at the journal portion 200b of the workpiece 200, and the rest device 87 has shoes 88 and 89 that contact the bottom and side surfaces of the workpiece 200 at the journal portion 200b of the workpiece 200. In this embodiment, a wheel is attached to the journal portion 200b of the workpiece 200, and the workpiece 200 is rotated using the wheel. At this time, the rotation may be transmitted by a universal joint.

The second bed section 30 is disposed along the x direction of the first bed section 20 at approximately the center of the z direction of the first bed section 20. The second bed section 30 is not limited to being disposed in the center of the longitudinal direction of the first bed section, but may be disposed in the middle of the longitudinal direction. A guide table 75 is placed and fixed on the second bed section 30. A pair of guide surfaces 76, 77 are disposed along the x direction on the guide table 75. A grinding wheel table 90 is disposed on the guide surfaces 76, 77. The grinding wheel table 90 has a grinding wheel 91. The grinding wheel 91 rotates around an axis O2 parallel to the axis O1. The grinding wheel table 90 is movable along the x direction, and the workpiece 200 is ground by bringing the rotated grinding wheel 91 into contact with the workpiece 200. The grinding wheel table 90 has a built-in motor that rotates the grinding wheel 91.

The first bed section 20 and the second bed section 30 described above are collectively referred to as the bed 10. FIG. 6 is a view of the frame and guide surface of the bed 10 used in a machine tool, viewed from the floor side. The first bed section 20 has a plurality of frames 20a to 20n arranged in the z direction. The number of frames of the first bed section 20 is arbitrary. The frame 20a has a rectangular parallelepiped shape and is composed of a frame frame 21a provided at positions corresponding to the 12 sides of the rectangular parallelepiped. Furthermore, the frame 20a has an X frame 22a in a shape where two planes cross. This X frame 22a is connected to four of the 12 sides of the frame 20a that are parallel to the y direction. The frame 20a has a truss structure due to the X frame 22a. Jacks 50 are arranged at the four corners on the floor side of the frame 20a, which is vertically below the bed 10. The same applies to the other frames 20b to 20n. The two jacks 50 at the boundary between two adjacent frames, for example, frame 20a and frame 20b, are shared by both frames 20a and 20b. The same is true for the jacks 50 between other adjacent frames. Therefore, it can be said that the jacks 50 are disposed on the lower periphery of the first bed portion 20. In FIG. 6, since there are many jacks 50, only some of the jacks 50 are indicated with reference numerals, and the rest are omitted for convenience of illustration. The structure and usage of the jacks 50 will be explained in detail later.

The second bed section 30 has three frames 30a, 30b, and 30c arranged along the x direction. Frame 30c is adjacent to frame 20h located approximately in the center of the first bed section 20. Frame 30a has a rectangular parallelepiped shape and has a frame frame 31a and an X frame 32a, similar to frame 20a. Similar to frame 22a, jacks 50 are arranged at the four corners of frame 30a on the floor side. Frame 30b has child frames 30b1 and 30b2 arranged along the z direction, and child frame 30b1 has a frame frame 31b1 and an X frame 32b1, similar to frame 20a. The same is true for child frame 30b2. Frame 30c has a similar configuration to frame 30b. Jacks 50 are arranged at the four corners of frames 30b and 30c on the floor side. In the figure, each jack 50 is indicated by an "O" mark, and the reference numerals are omitted for convenience of illustration. As with the first bed section 20, the two jacks 50 at the boundary between two adjacent frames, for example, frames 30a and 30b, are shared by the two frames 30a and 30b. The same is true in that jacks 50 are shared at the boundaries between frames 30b and 30c, and between frame 30c and frame 20h of the first bed section 20. Therefore, it can be said that the jacks 50 are located at the lower periphery of the second bed section 30. How to use these jacks 50 will be explained in detail later.

Of the multiple frames 20a to 20n of the first bed section 20, frames 20d, 20h, and 20l are formed longer in the direction along the z direction compared to the other frames 20a. In addition, the X frames 22d, 22h, and 22l of these frames 20d, 20h, and 20l are formed thicker than the X frames 22a of the other frames 20a. On the floor surface side of the centers of the X frames 22d, 22h, and 22l, flat support surfaces 23d, 23h, and 23l are formed in the middle of the guide surfaces 61 and 62. Leveling blocks 41, 44, and 42 are arranged on the support surfaces 23d, 23h, and 23l, respectively. The positions of the leveling blocks 41, 44, and 42 are between a pair of guide surfaces 61 and 62 provided on the opposite side of the floor surface of the first bed section 20 when viewed from the y direction, and in this embodiment, are located approximately in the center of the guide surfaces 61 and 62. Furthermore, the leveling blocks 41, 44, and 42 are arranged along the z direction, which is the longitudinal direction of the first bed section 20. The X frame 32a of the frame 30a of the second bed section 30 is formed thick like the X frames 22d, 22h, and 22l, and a leveling block 43 is arranged on the floor surface side in the center of the X frame 32a.

Figure 7 is an explanatory diagram showing the configuration of the guide surfaces 61, 62. Of the pair of guide surfaces 61, 62, the guide surface 61 is on the second bed portion 30 side (+x direction) and has a V-groove shape. On the other hand, the guide surface 62 is flat. Both guide surfaces 61, 62 are sliding guides and constitute a so-called V-flat guide. The guided portion of the table 70 fits into the V-groove of the guide surface 61, allowing the table 70 to move along the z direction and restricting movement along the x direction. The pair of guide surfaces 61, 62 are not limited to V-flat guides and may be of other shapes. They are also not limited to sliding guides and may be rolling guides. If a rolling guide is used, the upper surface of guide surface 61 will be flat, so in step 10 described below, a level 300 is placed along the z direction on the upper surface of guide surface 61, not on guide surface 62, as shown in FIG. 6, and the heights of first leveling block 41, second leveling block 42, and fourth leveling block 44 are adjusted to indicate horizontality in the direction along the z direction.

Figure 8 is an explanatory diagram showing the configuration of the leveling block 41. The leveling block 41 comprises a wedge-shaped lower block 411, a middle block 412, and an upper block 413, which are arranged vertically in a staggered manner so that the wedge-shaped pavement portions and thicker portions are arranged alternately. A bolt 414 is attached to the narrow end of the wedge of the middle block 412, and by rotating the bolt 414, the middle block 412 is moved along the axis of the bolt 414, and the upper block 413 is moved vertically downward or vertically upward.

Figure 9 is an explanatory diagram showing the configuration of the jack 50. The jack 50 comprises a base 51, a support 52, and a nut 53. The base 51 is placed on the floor. The base 51 has a protrusion 51a protruding upward. The support 52 has a cylindrical shape extending upward. The support 52 has a recess 52a at the bottom into which the protrusion 51a of the base 51 fits, and has a screw thread 52b on the side of the cylindrical shape. A nut 53 engages with the screw thread 52b, and when the nut 53 is rotated, the nut 53 moves the support 52 vertically upward or vertically downward depending on the direction of rotation. The upper surface 53a of the nut 53 is attached to the bed 10. When the nut 53 is rotated, the nut 53 moves vertically upward or downward, causing the position of the first bed portion 20 supported by the jack 50 to move vertically upward or downward.

Figure 10 is a process diagram illustrating the adjustment process of the bed 10. In step S5, the first to fourth leveling blocks 41 to 44 are placed in predetermined positions on the top surface of the table of the gate-type machining center, and the bed 10 of the machine tool 100 is placed on top of them. In the following step S10, an operator adjusts the heights of the first to fourth leveling blocks 41 to 44 to level the first bed portion 20 and the second bed portion 30 in the z and x directions. Generally, adjustment to make a member horizontal is called "leveling" or "horizontal leveling," so in this embodiment, adjustment to make the bed 10 horizontal is also called "leveling" or "horizontal leveling." The worker places a level 300 along the z direction on the upper surface of the guide surface 62 of the bed 10 above the first leveling block 41, the second leveling block 42, and the fourth leveling block 44 as shown in Fig. 4, and adjusts the heights of the first leveling block 41, the second leveling block 42, and the fourth leveling block 44 so as to indicate the horizontality in the direction along the z direction. The worker places a level 300 along the x direction on the upper surface of the guide surface 76 of the bed 10 above the third leveling block 43 as shown in Fig. 5, and adjusts the heights of the third leveling block 43 and the fourth leveling block 44 so as to indicate the horizontality in the direction along the x direction. Of course, a digital level or the like may be used to measure the levels along the z and x axes at once. It is also possible to attach a dial gauge to the side of the spindle head of the gate-type machining center, touch the needle of the dial gauge to the upper surface of the guide surface 62 of the bed 10 above the first leveling block 41, set the dial gauge scale to zero, and touch the needle of the dial gauge to the upper surface of the guide surface 62 of the bed 10 above the second leveling block 42 and the fourth leveling block 44 to set the horizontal level to zero. At the time of adjustment in step S10, none of the jacks 50 is substantially bearing the weight of the bed 10. The support pillar 52 of the jack 50 is not in contact with the base 51, or even if it is in contact, it does not affect the horizontal level of the bed 10.

In step S20, the worker moves the table of the gate-type machining center horizontally along guide surfaces 61, 62, and machines guide surfaces 61, 62 with an end mill that rotates on the spindle head. The spindle head of the gate-type machining center moves horizontally along guide surfaces 76, 77, perpendicular to the direction of movement of the table, and machines guide surfaces 76, 77 with an end mill that rotates on the spindle head. Since the gate-type machining center is set to a horizontal level with respect to the floor surface in advance, the guide surfaces 61, 62 and guide surfaces 76, 77 are set to a horizontal level by machining.

In step 25, the worker moves the bed 10 from the table of the gate-type machining center to the assembly station. The first to fourth leveling blocks 41 to 44 are placed in predetermined positions on the floor of the assembly station, and the bed 10 of the machine tool 100 is placed on them. The worker adjusts the heights of the first to fourth leveling blocks 41 to 44 to level the first bed section 20 and the second bed section 30 in the z direction and the x direction. The worker places a level 300 along the z direction on the upper surface of the guide surface 62 of the bed 10 above the first leveling block 41, the second leveling block 42, and the fourth leveling block 44, as shown in FIG. 5, and adjusts the heights of the first leveling block 41, the second leveling block 42, and the fourth leveling block 44 so as to indicate the level in the direction along the z direction. The worker places a level 300 along the x direction on the top surface of the guide surface 76 of the bed 10 above the third leveling block 43, as shown in FIG. 5, and adjusts the height of the third leveling block 43 and the fourth leveling block 44 so that they indicate horizontality in the x direction.

In step S30, the worker places the table 70 on the guide surfaces 61, 62 of the first bed portion 20, and places the grinding wheel head 90 on the guide surfaces 76, 77 of the guide table 75.

In step S40, the worker places the headstock 80, tailstock 82, and rest devices 84 and 87 on the table 70, and attaches the grinding wheel 91 to the grinding wheel head 90.

In step S50, the operator corrects the undulations of the guide surfaces 61, 62, and guide surfaces 76, 77 caused by the deflection of the bed 10 due to the load of the headstock 80, 82, rest device 84, 87, which are various devices on the table 70, and the grinding wheel table 90, which is various devices on the guide table 75, using the jack 50. The correction is performed by installing a measuring device that measures the vertical rolling on the table 70 and measuring the amount of rolling that occurs and changes as the table 70 moves. From the perspective of the position and rolling amount of the table 70, the operator can know at which position of the first bed section 20 the rolling is occurring and how much the rolling amount is, and can adjust it to be smaller using the jack 50. In addition, for the rolling that may occur in the grinding wheel table 90 moving in the second bed section 30, the rolling amount can be measured using a rolling measuring device in the same way, and adjustments can be made to reduce it.

When the machine tool (grinding machine) 100 is delivered to a customer, the first to fourth leveling blocks 41 to 44 are placed in predetermined positions on the floor of the customer's factory, and the machine tool 100 is placed thereon. An operator places a level 300 along the z direction on the upper surface of the guide surface 62 of the bed 10 above the first leveling block 41 and the second leveling block 42, as shown in FIG. 5, and adjusts the heights of the first leveling block 41, the second leveling block 42, and the fourth leveling block 44 so as to indicate the horizontality in the direction along the z direction. An operator places a level 300 along the x direction on the upper surface of the guide surface 76 of the bed 10 above the third leveling block 43, as shown in FIG. 5, and adjusts the heights of the third leveling block 43 and the fourth leveling block 44 so as to indicate the horizontality in the direction along the x direction.
A measuring device for measuring vertical rolling is installed on the first table 70, and the amount of rolling that occurs and changes with the movement of the first table 70 is measured. If the worker can see the position and amount of rolling of the first table 70, he or she can know at which position of the first bed portion 20 the rolling is occurring and how large the amount of rolling is, and can adjust the amount to be smaller with the jack 50. Note that with regard to rolling that may occur in the moving grinding wheel head 90 in the second bed portion 30, the amount of rolling can be measured similarly using a rolling measuring device, and adjustments can be made to reduce the amount of rolling.

According to the bed adjustment method of the present embodiment, the worker uses four leveling blocks 41 to 44 to level the bed 10 in the z direction and the x direction, so that leveling of the bed 10 is easy and the variation between workers is reduced. In addition, after leveling the bed, the worker processes the guide surfaces 61 and 62 so that they are horizontal, so that the guide surfaces 61 and 62 can be easily processed to be horizontal. Furthermore, after placing various devices on the table 70 and guide table 75 on the bed 10, the inclination of the bed 10 caused by the load of these various devices is corrected using the jacks 50 provided on each frame, so that the first bed section 20 can easily be leveled after placing various heavy devices, here the headstock 80, tailstock 82, and rest devices 84 and 87, on the table 70. Furthermore, by adjusting the jacks 50, rolling can be suppressed when these devices are moved in the z direction along the guide surfaces 61 and 62, and processing accuracy can be improved.

In this embodiment, there are four leveling blocks, but there are at least three leveling blocks under the first bed section 20, and at least one leveling block under the second bed section 30. Depending on the length of the first and second beds 20 and 30, there may be five or more. The jacks 50 do not need to be arranged for each frame, but may be arranged at a position corresponding to the weight of the object placed on the bed 10. The first, second, and fourth leveling blocks 41, 42, and 44 are arranged in a straight line and may be arranged at a position where the load of the bed 10 can be received in a balanced manner. If these leveling blocks are arranged in the center of the guide surfaces 61 and 62 as in the embodiment, the load on the guide surfaces 61 and 62 can be received in a balanced manner, which is preferable, but it is not necessary to be limited to the center of the guide surfaces 61 and 62. In addition, the first leveling block 41 and the second leveling block 42 do not necessarily need to be arranged at an equal distance from the leveling block 44. The placement of these leveling blocks may be determined according to the shape of the bed 10 and the placement of heavy objects such as machine tools that will be placed on it.

In the above embodiment, between steps S10 and S20, a step may be performed in which the height of the jacks 50 of each frame is adjusted to a level that can withstand the processing load in preparation for the subsequent processing of the guide surfaces 61, 62. The guide surfaces 61, 62 are subjected to processing (step S20) to level their surfaces, and therefore receive a processing load from above. For this reason, to prevent the frame between the leveling blocks from bending downward due to this processing load, the support pillars 52 of the jacks 50 between the leveling blocks are moved downward, and the frame is supported to an extent that does not affect the horizontal level.

This disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the spirit of the disclosure. For example, the technical features of the embodiments corresponding to the technical features in each form described in the Summary of the Invention column can be replaced or combined as appropriate to solve some or all of the above-described problems or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described in this specification as essential, it can be deleted as appropriate.

10...bed, 20...first bed section, 20a-20n...frame, 21a...frame frame, 22a, 22d, 22h, 22l...X frame, 23d, 23h, 23l...support surface, 30...second bed section, 30a, 30b, 30c...frame, 30b1, 30b2...child frame, 31a, 31b1...frame frame, 32a, 32b1...X frame, 41-44...leveling block, 50...jack, 51...base, 51a...projection, 52...pillar, 52a...recess, 52b...thread, 53...nut, 53a...upper surface, 61, 62...guide surface, 70...table, 71, 72...guide surface, 75...guide table, 76, 77...guide surface, 80...headstock, 82...tailstock, 81, 83...center, 84, 87...rest device, 85, 86, 88, 89...shoe, 90...grinding wheel head, 91...grinding wheel, 100...machine tool, 200...workpiece, 300...level, 411...lower block, 412...middle block, 413...upper block, 414...bolt, O1, O2...shaft

Claims (5)

A method for adjusting a bed having a first bed portion having a rectangular parallelepiped shape and a second bed portion disposed in a longitudinal middle of the first bed portion, comprising the steps of:
Supporting the bed using at least three leveling blocks arranged along the longitudinal direction of the first bed section under the first bed section and at least one leveling block arranged under the second bed section;
adjusting the bed so that it is level using the leveling blocks;
horizontally machining a pair of guide surfaces provided on an upper surface of the first bed portion;
positioning a device over the guide surface;
measuring an amount of vertical rolling of the bed caused by the arrangement of the device on the guide surface by a rolling measuring device in association with a position of the bed;
correcting an inclination of the guide surface after the device is placed, using a plurality of jacks arranged on an outer periphery lower portion of the first bed portion and an outer periphery lower portion of the second bed portion, according to the amount of rolling ;
A method for adjusting a bed comprising: 2. A method for adjusting a bed according to claim 1, comprising the steps of:
A bed adjustment method, in which the step of adjusting the bed so that it is level includes placing a spirit level on the bed at positions corresponding to the four leveling blocks, and adjusting the multiple leveling blocks so that the spirit level indicates horizontal. A method for adjusting a bed according to claim 1 or 2, comprising the steps of:
A bed adjustment method comprising a step of receiving a machining load on the guide surface using a plurality of the jacks before executing the step of machining the guide surface horizontally. A method for adjusting a bed having a first bed portion having a rectangular parallelepiped shape and a second bed portion disposed in a longitudinal middle of the first bed portion, comprising the steps of:
Supporting the bed using at least three leveling blocks arranged along the longitudinal direction of the first bed section under the first bed section and at least one leveling block arranged under the second bed section;
adjusting the bed so that it is level using the leveling blocks;
horizontally machining a pair of guide surfaces provided on an upper surface of the first bed portion;
positioning a device over the guide surface;
correcting an inclination of the guide surface after the device is placed, using a plurality of jacks arranged on an outer periphery lower portion of the first bed portion and an outer periphery lower portion of the second bed portion;
A step of receiving a machining load of the guide surface using a plurality of the jacks, the step being performed before the step of horizontally machining the guide surface;
A method for adjusting a bed comprising: A method for adjusting a bed according to claim 4, comprising the steps of:
A bed adjustment method, in which the step of adjusting the bed so that it is level includes placing a spirit level on the bed at positions corresponding to the four leveling blocks, and adjusting the multiple leveling blocks so that the spirit level indicates horizontal.

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