CN113701604A - Measuring tool and method for measuring linear rail spacing of machine tool body - Google Patents
Measuring tool and method for measuring linear rail spacing of machine tool body Download PDFInfo
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- CN113701604A CN113701604A CN202111073161.XA CN202111073161A CN113701604A CN 113701604 A CN113701604 A CN 113701604A CN 202111073161 A CN202111073161 A CN 202111073161A CN 113701604 A CN113701604 A CN 113701604A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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Abstract
本发明公开了一种用于测量机床床身线轨间距的量具及方法，该模具包括框架、第一测量单元和第二测量单元，第一测量单元安装在框架的一端，第二测量单元安装在框架的另一端，第一测量单元与第二测量单元之间的间距与机床床身的线轨间距相适配，机床床身的线轨间距为机床床身上的左右线轨之间的距离；第一测量单元包括百分表、移动测头、测钉、滑座、滑块、第一弹簧和定位块，第二测量单元包括可调测头、压紧块、压紧螺钉和第二弹簧。该量具整体结构稳定性和通用性好、使用便捷，可提高测量精度和重复测量精度，从而提高机床床身加工阶段的自检准确性并保证机床床身线轨间距的一致性，减少返修次数，节约时间成本，提高生产效率。
The invention discloses a measuring tool and method for measuring the distance between the line and rail of a machine tool bed. The mold comprises a frame, a first measuring unit and a second measuring unit. The first measuring unit is installed at one end of the frame, and the second measuring unit is installed At the other end of the frame, the distance between the first measuring unit and the second measuring unit is adapted to the distance between the line rails of the machine bed, and the distance between the line rails of the machine bed is the distance between the left and right line rails on the machine bed ; The first measuring unit includes a dial indicator, a moving probe, a measuring pin, a sliding seat, a slider, a first spring and a positioning block, and the second measuring unit includes an adjustable probe, a pressing block, a pressing screw and a second spring. The overall structural stability and versatility of the measuring tool is good, and it is easy to use. It can improve the measurement accuracy and repeated measurement accuracy, thereby improving the accuracy of self-inspection during the machining phase of the machine tool bed, ensuring the consistency of the line and rail spacing of the machine tool bed, and reducing the number of repairs. , save time and cost and improve production efficiency.
Description
Technical Field
The invention relates to a measuring tool, in particular to a measuring tool and a method for measuring the linear rail spacing of a machine tool body.
Background
In the actual production process, the design of a spliced bed body is adopted for bed body parts of machine tool products of many machine types, the bed body is used as a base for bearing a workbench, the running precision of the workbench depends on the precision of bed body linear rails to a great extent, and even the spliced bed body with insufficient consistency of bed body linear rail intervals cannot be normally assembled, so that the consistency of the bed body linear rail intervals of all parts of the spliced bed body is very necessary.
The measuring tool adopted by the measuring method for ensuring the consistency of the distance between the lathe bed linear rails at the present stage mainly comprises two square steel pipes which are vertically fixed in a T shape, and is matched with a dial indicator arranged on the lathe bed linear rail at one side to realize consistency measurement. The measuring process comprises the following steps: firstly, the measuring tool is placed on the other working table surface with the standard lathe bed line rail spacing, the plus and minus numerical values of the dial indicator are set, then the measuring tool is transferred between the lathe bed line rails to be measured, the size of the line rail spacing is judged through the positive and negative change of the numerical values of the dial indicator, and then whether the line rail spacing can meet the requirement of consistency is judged. However, the measuring tool has many problems in the using process, and uncontrollable factors in the measuring tool transferring process can cause the dial indicator to move, so that the repeated measurement precision of the measuring tool is poor, and the consistency of the line-rail spacing is difficult to ensure.
Disclosure of Invention
The invention aims to solve the technical problems that aiming at the defects of the prior art, the invention provides the measuring tool and the method for measuring the distance between the linear rails of the machine tool body, which have good overall structure stability and universality and convenient use, and can improve the measuring precision and the repeated measuring precision, thereby improving the self-checking accuracy of the machine tool body in the processing stage, ensuring the consistency of the distance between the linear rails of the machine tool body, reducing the repair times, saving the time cost and improving the production efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a measuring tool for measuring the distance between the linear rails of a machine tool body comprises a frame, a first measuring unit and a second measuring unit, wherein the first measuring unit is installed at one end of the frame, the second measuring unit is installed at the other end of the frame, the distance between the first measuring unit and the second measuring unit is matched with the distance between the linear rails of the machine tool body, and the distance between the linear rails of the machine tool body is the distance between the left linear rail and the right linear rail on the machine tool body;
the first measuring unit comprises a dial indicator, a movable measuring head, a measuring pin, a sliding seat, a sliding block, a first spring and a positioning block, the sliding seat is fixed at one end of the frame, the sliding block is arranged in the sliding seat in a left-right sliding manner, the first spring transversely penetrates through the inner side wall of the sliding seat from left to right, two ends of the first spring respectively extend into the sliding block and the frame, the measuring pin is transversely arranged on the outer side of the sliding block from left to right, a measuring rod of the dial indicator transversely penetrates through the sliding seat from left to right and is opposite to the measuring pin, the positioning block is arranged on the lower side of the frame, the movable measuring head penetrates through the positioning block from bottom to top to be connected with the sliding block through threads, the movable measuring head is not in contact with the positioning block, and the bottom of the movable measuring head is provided with a first positioning part, the width of the first positioning part is smaller than that of the machine tool line rail groove, and the first positioning part is used for being attached to a side leaning surface of the machine tool line rail groove in the measuring process;
the second measuring unit comprises an adjustable measuring head, a pressing block, a pressing screw and a second spring, the adjustable measuring head comprises a vertical part and a horizontal part which are vertically arranged in a T-shaped integral manner, the other end of the frame is provided with a through groove which is communicated up and down, the vertical part is arranged in the through groove in a penetrating manner, the width of the through groove is larger than that of the vertical part, the edge of the through groove is provided with a scale mark, a backing plate is clamped between the horizontal part and the frame, the bottom of the horizontal part is integrally provided with a second positioning part, the width of the second positioning part is smaller than that of a line rail groove of a machine tool body, the second positioning part is used for being attached to the side leaning surface of the line rail groove of another machine tool body in the measuring process, the pressing block is arranged on the upper side of the adjustable measuring head and is embedded into the through groove, the adjustable measuring head is internally provided with a thread through hole, the hold-down screw penetrates through the hold-down block and is in threaded connection with the thread through hole, the second spring is sleeved on the hold-down screw, and the second spring is arranged between the hold-down block and the adjustable measuring head through a gasket in a compression mode.
Preferably, two slide bars are fixed on the left and right sides of the slide base, the two slide bars respectively transversely penetrate through the slide block from left to right, and the slide block can slide along the two slide bars from left to right.
Preferably, the bottom of the positioning block is provided with two positioning bosses at intervals in the front and back, the width of each positioning boss is smaller than that of the linear rail groove of the machine tool body, and the movable measuring head is arranged between the two positioning bosses. The two positioning bosses have an initial positioning effect on the placement of the measuring tool on the machine tool body.
Preferably, one end of the frame is vertically provided with a fixing screw, and the fixing screw is used for tightly propping and fixing the dial indicator. The dial indicator is fixed by the fixing screw, so that the structure is simple, and the use is convenient and flexible.
Preferably, the number of the second positioning portions is two, and the two second positioning portions are arranged at intervals in front of and behind each other. The reliability of the measuring result can be ensured by the design of the two second positioning parts which are spaced front and back.
Preferably, a plurality of handles are arranged on the upper side of the frame.
Preferably, the frame adopts a hollow design, so that the weight of the measuring tool is reduced, and the use is convenient.
A method for measuring the linear rail spacing of the machine tool body by using the measuring tool comprises the following steps:
(1) placing the measuring tool on a standard machine tool body model, enabling a first positioning part at the bottom of the movable measuring head to be attached to a side leaning surface of one machine tool body line rail groove on the standard machine tool body model, and enabling a second positioning part at the bottom of the adjustable measuring head to be attached to a side leaning surface of the other machine tool body line rail groove on the standard machine tool body model;
(2) adjusting the position of a measuring rod of the dial indicator to enable the head of the measuring rod to prop against a measuring nail on a sliding block, enabling the sliding block to be in a static state under the elastic action of a first spring, enabling the measuring rod of the dial indicator to generate a certain numerical value due to compression, fixing the position of the dial indicator, adjusting the reading of the dial indicator to zero, and recording the scale value corresponding to the inner side surface of the compression block on the scale mark at the edge of the through groove at the moment, wherein the scale value is the standard value of the line-rail spacing of the machine tool body;
(3) transferring the measuring tool to a machine tool body to be measured, enabling a second positioning part at the bottom of the adjustable measuring head to be attached to a side leaning surface of another machine tool body line rail groove on the machine tool body to be measured, and enabling a first positioning part at the bottom of the movable measuring head to be attached to a side leaning surface of one machine tool body line rail groove on the machine tool body to be measured, wherein at the moment, if the line rail distance of the machine tool body to be measured is larger relative to a standard value, the sliding block can slide to the dial indicator under the action of the resilience force of the first spring, so that a measuring rod of the dial indicator displays a positive value due to further compression, and the positive value is the larger value of the line rail distance of the machine tool body to be measured; if the line rail spacing of the machine tool body to be measured is smaller than the standard value, the movable measuring head can drive the sliding block to slide to the first spring, so that the dial indicator which is originally kept in a pressed state is loosened and a negative value is displayed, and the negative value is the smaller value of the line rail spacing of the machine tool body to be measured;
(4) and calculating to obtain an actual value of the line rail spacing of the machine tool body to be measured through the obtained large value or small value of the line rail spacing of the machine tool body to be measured.
Compared with the prior art, the invention has the following advantages:
in the measuring and using process of the measuring tool, the measuring tool can be transferred to the machine tool body to be measured only by zeroing the dial indicator on a standard machine tool body model, the line rail spacing of the machine tool body to be measured is conveniently and quickly measured, the overall structure stability of the measuring tool is good, the displacement of parts cannot occur in the transferring process, and the measuring precision and the repeated measuring precision can be improved, so that the self-checking accuracy of the machine tool body in the processing stage is improved, the consistency of the line rail spacing of the machine tool body is ensured, the repair times are reduced, the time cost is saved, and the production efficiency is improved;
the position of the adjustable measuring head of the measuring tool is adjustable within a certain range, so that the adaptability of the measuring tool and the machine tool body can be improved, the universality is good, the measuring tool is not limited to the machine tool body with a single specification, and the measurement requirement of the line track spacing of the machine tool bodies with various specifications can be met.
Drawings
FIG. 1 is an effect diagram of the measuring tool in the embodiment after being placed on a standard machine tool body model;
FIG. 2 is a top view corresponding to FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2, enlarged 3 times;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is an enlarged view at C of FIG. 4;
FIG. 6 is an enlarged view of FIG. 4 at D;
FIG. 7 is an external view of a positioning block in the embodiment;
fig. 8 is an external view of an adjustable probe in an embodiment.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1: the utility model provides a measuring tool for measuring lathe bed line rail interval, as shown in the figure, including frame 1, first measuring unit and second measuring unit, frame 1 adopts the fretwork design, two handles 11 are installed to the upside of frame 1, first measuring unit installs the one end at frame 1, the other end at frame 1 is installed to the second measuring unit, interval between first measuring unit and the second measuring unit and the line rail interval looks adaptation of lathe bed, the line rail interval of lathe bed is the distance between the left and right sides line rail on the lathe bed.
In embodiment 1, the first measuring unit includes a dial indicator 2, a movable measuring head 22, a measuring pin 23, a sliding seat 24, a sliding block 25, a first spring 26 and a positioning block 27, the sliding seat 24 is fixed at one end of the frame 1, the sliding block 25 is arranged in the sliding seat 24 in a manner of being capable of sliding left and right, two sliding rods 28 are fixed on the sliding seat 24 left and right, the two sliding rods 28 respectively transversely penetrate the sliding block 25 left and right, and the sliding block 25 can slide left and right along the two sliding rods 28; a first spring 26 transversely penetrates through the inner side wall of the sliding seat 24 from left to right, two ends of the first spring 26 respectively extend into the sliding block 25 and the frame 1, the measuring pin 23 is transversely installed on the outer side of the sliding block 25 from left to right, the measuring rod 21 of the dial indicator 2 transversely penetrates through the sliding seat 24 from left to right and is opposite to the measuring pin 23 in position, a fixing screw 12 is vertically installed at one end of the frame 1, the fixing screw 12 is used for tightly jacking and fixing the dial indicator 2, a positioning block 27 is arranged on the lower side of the frame 1, and the positioning block 27 is used for determining the horizontal position of the measuring tool in the measuring process; the movable measuring head 22 penetrates through the positioning block 27 from bottom to top to be in threaded connection with the sliding block 25, the movable measuring head 22 is not in contact with the positioning block 27, a first positioning portion 29 is arranged at the bottom of the movable measuring head 22, the width of the first positioning portion 29 is smaller than that of a machine tool body line rail groove, and the first positioning portion 29 is used for being attached to a side leaning surface of the machine tool body line rail groove in the measuring process.
In embodiment 1, the second measuring unit includes an adjustable measuring head 31, a hold-down block 32, a hold-down screw 33 and a second spring 34, the adjustable measuring head 31 includes a vertical portion 35 and a horizontal portion 36 which are vertically arranged in a T-shape, the other end of the frame 1 is provided with a through groove 13 which is vertically communicated, the vertical portion 35 is arranged in the through groove 13 in a penetrating manner, the width of the through groove 13 is greater than the width of the vertical portion 35, the edge of the through groove 13 is provided with a scale line 14, a backing plate 4 is clamped between the horizontal portion 36 and the frame 1, the thickness of the backing plate 4 can be matched and ground according to requirements, and the levelness of the measuring tool in the using process can meet requirements; two second positioning portions 37 arranged at a front-rear interval are integrally arranged at the bottom of the horizontal portion 36, the width of each second positioning portion 37 is smaller than that of a machine tool body line rail groove, each second positioning portion 37 is used for being attached to a side leaning surface of another machine tool body line rail groove in a measuring process, the pressing block 32 is arranged on the upper side of the adjustable measuring head 31 and embedded into the through groove 13, a threaded through hole 38 is formed in the adjustable measuring head 31, the pressing screw 33 penetrates through the pressing block 32 and is connected to the threaded through hole 38 in a threaded mode, the pressing block 32 can be matched with the pressing screw 33 to determine the downward position of the adjustable measuring head 31, the second spring 34 is sleeved on the pressing screw 33, the second spring 34 is arranged between the pressing block 32 and the adjustable measuring head 31 in a compression mode through a gasket 39, and the second spring 34 and the gasket 39 are beneficial to elastic resetting of the pressing block 32 and the pressing screw 33.
In embodiment 1, two positioning bosses 20 are provided at intervals in the front and rear of the bottom of the positioning block 27, the width of the positioning boss 20 is smaller than the width of the linear rail groove of the machine tool body, and the movable probe 22 is provided between the two positioning bosses 20.
Example 2: the method for measuring the linear rail spacing of the machine tool body by using the measuring tool comprises the following steps:
(1) placing the gauge on the standard machine tool bed model 5, so that the first positioning part 29 at the bottom of the movable measuring head 22 is attached to the side leaning surface 52 of one machine tool line rail groove 51 on the standard machine tool bed model 5, and the second positioning part 37 at the bottom of the adjustable measuring head 31 is attached to the side leaning surface 54 of the other machine tool line rail groove 53 on the standard machine tool bed model 5;
(2) adjusting the position of a measuring rod 21 of the dial indicator 2 to enable the head of the measuring rod 21 to prop against a measuring nail 23 on a sliding block 25, at the moment, under the elastic action of a first spring 26, the sliding block 25 is in a static state, the measuring rod 21 of the dial indicator 2 generates a certain numerical value due to compression, then fixing the position of the dial indicator 2 through a fixing screw 12 and adjusting the reading of the dial indicator 2 to zero, and recording the scale value corresponding to the side leaning surface 54 of a machine tool body line rail groove 53 below a compression block 32 on a scale mark 14 at the edge of a through groove 13, wherein the scale value is the standard value of the line rail distance of the machine tool body;
(3) transferring the measuring tool to a machine tool body to be measured (the structure of the measuring tool is completely the same as that of a machine tool body model 5), enabling a second positioning part 37 at the bottom of an adjustable measuring head 31 to be attached to a side leaning surface of another machine tool body line rail groove on the machine tool body to be measured (see fig. 6), and enabling a first positioning part 29 at the bottom of a movable measuring head 22 to be attached to a side leaning surface of a machine tool body line rail groove on the machine tool body to be measured (see fig. 5), wherein at the moment, if the line rail distance of the machine tool body to be measured is larger than a standard value, a sliding block 25 slides downwards to a dial indicator 2 under the action of the resilience force of a first spring 26, so that a measuring rod 21 of the dial indicator 2 displays a positive value due to further compression, and the positive value is the larger value of the line rail distance of the machine tool body to be measured; if the line rail spacing of the machine tool body to be measured is smaller than the standard value, the movable measuring head 22 drives the sliding block 25 to slide to the first spring 26, so that the dial indicator 2 which is originally kept in a pressed state is loosened and displays a negative value, wherein the negative value is the smaller value of the line rail spacing of the machine tool body to be measured;
(4) and calculating to obtain an actual value of the line rail spacing of the machine tool body to be measured through the obtained large value or small value of the line rail spacing of the machine tool body to be measured.
Claims (8)
1. A measuring tool for measuring the distance between the linear rails of a machine tool body is characterized by comprising a frame, a first measuring unit and a second measuring unit, wherein the first measuring unit is installed at one end of the frame, the second measuring unit is installed at the other end of the frame, the distance between the first measuring unit and the second measuring unit is matched with the distance between the linear rails of the machine tool body, and the distance between the linear rails of the machine tool body is the distance between a left linear rail and a right linear rail on the machine tool body;
the first measuring unit comprises a dial indicator, a movable measuring head, a measuring pin, a sliding seat, a sliding block, a first spring and a positioning block, the sliding seat is fixed at one end of the frame, the sliding block is arranged in the sliding seat in a left-right sliding manner, the first spring transversely penetrates through the inner side wall of the sliding seat from left to right, two ends of the first spring respectively extend into the sliding block and the frame, the measuring pin is transversely arranged on the outer side of the sliding block from left to right, a measuring rod of the dial indicator transversely penetrates through the sliding seat from left to right and is opposite to the measuring pin, the positioning block is arranged on the lower side of the frame, the movable measuring head penetrates through the positioning block from bottom to top to be connected with the sliding block through threads, the movable measuring head is not in contact with the positioning block, and the bottom of the movable measuring head is provided with a first positioning part, the width of the first positioning part is smaller than that of the machine tool line rail groove, and the first positioning part is used for being attached to a side leaning surface of the machine tool line rail groove in the measuring process;
the second measuring unit comprises an adjustable measuring head, a pressing block, a pressing screw and a second spring, the adjustable measuring head comprises a vertical part and a horizontal part which are vertically arranged in a T-shaped integral manner, the other end of the frame is provided with a through groove which is communicated up and down, the vertical part is arranged in the through groove in a penetrating manner, the width of the through groove is larger than that of the vertical part, the edge of the through groove is provided with a scale mark, a backing plate is clamped between the horizontal part and the frame, the bottom of the horizontal part is integrally provided with a second positioning part, the width of the second positioning part is smaller than that of a line rail groove of a machine tool body, the second positioning part is used for being attached to the side leaning surface of the line rail groove of another machine tool body in the measuring process, the pressing block is arranged on the upper side of the adjustable measuring head and is embedded into the through groove, the adjustable measuring head is internally provided with a thread through hole, the hold-down screw penetrates through the hold-down block and is in threaded connection with the thread through hole, the second spring is sleeved on the hold-down screw, and the second spring is arranged between the hold-down block and the adjustable measuring head through a gasket in a compression mode.
2. The measuring tool for measuring the line rail distance of the machine tool body according to claim 1, wherein two slide bars are fixed on the left and right sides of the slide carriage, the two slide bars respectively transversely penetrate through the slide block from left to right, and the slide block can slide along the two slide bars from left to right.
3. The measuring tool for measuring the line rail distance of the machine tool body according to claim 1, wherein two positioning bosses are arranged at the bottom of the positioning block at intervals in front and back, the width of each positioning boss is smaller than that of a line rail groove of the machine tool body, and the movable measuring head is arranged between the two positioning bosses.
4. The gauge for measuring the distance between the linear rails of the machine tool body according to claim 1, wherein a fixing screw is vertically installed at one end of the frame, and the fixing screw is used for tightly propping and fixing the dial indicator.
5. The measuring tool for measuring the line rail spacing of the machine tool body according to claim 1, wherein the number of the second positioning portions is two, and the two second positioning portions are arranged at a distance from each other.
6. The gauge for measuring the linear rail spacing of a machine tool bed according to claim 1, wherein the frame has handles mounted on the upper side thereof.
7. The gauge for measuring the linear rail spacing of a machine tool body according to claim 1, wherein the frame is hollow.
8. A method of measuring the spacing of the rails of a machine bed using the gauge of any of claims 1-7, comprising the steps of:
(1) placing the measuring tool on a standard machine tool body model, enabling a first positioning part at the bottom of the movable measuring head to be attached to a side leaning surface of one machine tool body line rail groove on the standard machine tool body model, and enabling a second positioning part at the bottom of the adjustable measuring head to be attached to a side leaning surface of the other machine tool body line rail groove on the standard machine tool body model;
(2) adjusting the position of a measuring rod of the dial indicator to enable the head of the measuring rod to abut against a measuring nail on a sliding block, enabling the sliding block to be in a static state under the elastic action of a first spring, enabling the measuring rod of the dial indicator to generate a certain numerical value due to compression, fixing the position of the dial indicator, adjusting the reading of the dial indicator to zero, recording a scale value corresponding to the side leaning surface of a line rail groove of the machine tool body below a compression block on a scale mark at the edge of a through groove, wherein the scale value is the standard value of the line rail distance of the machine tool body;
(3) transferring the measuring tool to a machine tool body to be measured, enabling a second positioning part at the bottom of the adjustable measuring head to be attached to a side leaning surface of another machine tool body line rail groove on the machine tool body to be measured, and enabling a first positioning part at the bottom of the movable measuring head to be attached to a side leaning surface of one machine tool body line rail groove on the machine tool body to be measured, wherein at the moment, if the line rail distance of the machine tool body to be measured is larger relative to a standard value, the sliding block can slide to the dial indicator under the action of the resilience force of the first spring, so that a measuring rod of the dial indicator displays a positive value due to further compression, and the positive value is the larger value of the line rail distance of the machine tool body to be measured; if the line rail spacing of the machine tool body to be measured is smaller than the standard value, the movable measuring head can drive the sliding block to slide to the first spring, so that the dial indicator which is originally kept in a pressed state is loosened and a negative value is displayed, and the negative value is the smaller value of the line rail spacing of the machine tool body to be measured;
(4) and calculating to obtain an actual value of the line rail spacing of the machine tool body to be measured through the obtained large value or small value of the line rail spacing of the machine tool body to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111073161.XA CN113701604B (en) | 2021-09-14 | 2021-09-14 | A measuring tool and method for measuring the spacing between linear rails of a machine tool bed |
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| CN202111073161.XA CN113701604B (en) | 2021-09-14 | 2021-09-14 | A measuring tool and method for measuring the spacing between linear rails of a machine tool bed |
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| DE102014107784A1 (en) * | 2014-06-03 | 2015-12-03 | Marposs Gmbh | System and method for measuring a dimension of a workpiece |
| WO2016151836A1 (en) * | 2015-03-26 | 2016-09-29 | 富士機械製造株式会社 | Jig for conveying separate-type control panel |
| CN213729613U (en) * | 2020-11-05 | 2021-07-20 | 台州新发自动化设备有限公司 | Numerical control machine tool for line rail of flat machine tool body |
| CN216159790U (en) * | 2021-09-14 | 2022-04-01 | 宁波海天精工股份有限公司 | A measuring tool for measuring the distance between the line rails of the machine tool bed |
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