JP5230466B2 - Shape measuring method and machine having measuring function - Google Patents

Description

  The present invention relates to a shape measuring method and a machine having a measuring function for measuring the shape of a workpiece with a measuring head mounted on a spindle of a machine tool having a rotary feed shaft or a coordinate measuring machine.

  Patent Documents 1 and 2 are disclosed as conventional examples related to a shape measuring method for measuring the shape of a workpiece with a measuring head. Patent Document 1 discloses a method and apparatus for guiding a measurement operation when measuring the position coordinates and dimensions of a work, and Patent Document 2 discloses a method and apparatus for controlling the mounting posture of a work fixed to a table. To do.

  In Patent Document 1, when measuring the position coordinates and dimensions of a workpiece, the measurement operation process is displayed by graphic or numerical value for each measurement type, the measurement procedure is guided, and the progress of the measurement operation to which stage is also shown. It can be displayed.

  When the measurement reference plane of the workpiece is not perpendicular to the axis of the main axis, for example, when an oblique hole is formed, a measurement error occurs, and the oblique hole cannot be accurately measured. Patent Document 2 discloses a method of making a workpiece measurement reference plane perpendicular to the axis of the main axis.

JP 2008-1111770 A JP 2007-219591 A

  As described above, the technique described in Patent Document 1 causes a measurement error when the workpiece measurement reference plane is not perpendicular to the axis of the main axis, for example, when an oblique hole is formed. There is a problem that holes cannot be measured accurately. The technique of Patent Document 2 is for starting the measurement program of the NC device and controlling the posture of the workpiece, except that the operator operates the input device to start the measurement instruction means of the NC device. Every time the shape of the workpiece is changed, it is necessary to edit the measurement program. For this reason, when the shape of a workpiece | work etc. are changed frequently, there exists a problem that the workability | operativity of a shape measurement is bad.

  The present invention provides a machine having a shape measuring method and a measuring function capable of accurately measuring the shape of a workpiece even when the measurement reference plane of the workpiece fixed to the table is inclined and having good workability in measurement work. The purpose is to provide.

  To achieve the above object, according to the present invention, in a shape measuring method for measuring the shape of a workpiece fixed to a table by a measuring head mounted on a spindle of a machine having a linear feed shaft and a rotary feed shaft, A step of displaying on the screen a plurality of measurement operation directions that the measurement head approaches the workpiece; and one of the plurality of measurement operation directions that approaches the measurement reference plane of the workpiece. Selecting, measuring the coordinate value of at least one point on the measurement reference plane of the workpiece by approaching the selected measurement operation direction, and measuring the measurement reference plane based on the measured coordinate value. A step of calculating an indexing angle of the rotary feed shaft required to be oriented perpendicular to the axis of the main shaft of the shaft, and the rotation by the calculated indexing angle Ri rotate the shaft, and a step of positioning vertically the measurement reference surface relative to the axis of the main shaft, the shape measuring method for measuring the shape of the workpiece is provided.

  Further, according to the present invention, the method further includes the step of measuring the shape of the workpiece with the measurement reference plane perpendicular to the axis of the main axis, and then converting the measurement result to another coordinate system and displaying the result. A shape measurement method is provided.

  According to the present invention, in the step of positioning the measurement reference plane perpendicular to the axis of the main shaft, if the rotary feed shaft is rotated by the index angle, a further rotary feed command is input. Even if the function which ignores works, the shape measuring method including the process of stopping the rotation of the rotary feed shaft at a predetermined position is provided.

  The present invention further includes a linear feed shaft and a rotary feed shaft, a table for holding a workpiece, and a measurement head mounted on a main shaft that moves relative to the table. In a machine having a measurement function for measuring a shape of a workpiece, a display unit that displays a plurality of measurement operation directions that the measurement head approaches the workpiece on a screen, and the plurality of measurement operations displayed on the screen An input unit for inputting any one of the measurement operation directions to approach the measurement reference plane of the workpiece, and the measurement head approaches the workpiece in the measurement operation direction input to the input unit. Necessary for orienting the measurement reference plane perpendicular to the axis of the main axis based on the coordinate value of at least one point of the measurement reference plane of the workpiece measured in this way. Machine is provided with a Do the arithmetic unit for calculating the index angle of the rotary feed shaft, equipped with a measurement function.

  As described above, according to the shape measuring method and the machine having the measuring function of the present invention, the workpiece can be positioned in a posture in which the measurement reference plane is perpendicular to the axis of the main shaft. The shape of the workpiece can be accurately measured. When shape measurement is performed, a plurality of measurement operation directions that the measurement head approaches the workpiece are displayed on the screen. This provides guidance for the operator to manually measure the shape, thereby improving the workability of the shape measurement.

It is a block diagram which shows the whole structure of the apparatus of this invention. It is explanatory drawing which shows the state by which the workpiece | work is being fixed to the table. It is a figure which shows the screen in the case of positioning a workpiece | work in the attitude | position in which a measurement reference plane becomes perpendicular | vertical with respect to the axis line of a main axis | shaft. It is a figure which shows the screen in the case of measuring the center position of a hole. It is a figure which shows the screen in the case of measuring the position coordinate of a corner.

  FIG. 1 is a block diagram showing the overall configuration of a vertical machining center as one form of a machine for measuring the shape of a workpiece. The machine of the present invention is not limited to the machining center 1 of the present embodiment, and other machine tools equipped with a control device and a three-dimensional measuring machine are also included in the machine of the present invention. Specific examples of workpiece shape measurement include measurement of the center position of the workpiece hole, measurement of the position of the intersection of the two sides of the corner, measurement of the corner radius of the corner, measurement of the diameter of the workpiece hole, measurement of the groove width Measurement, measurement of two-sided width, etc. can be mentioned. The “measuring head” mounted on the main spindle of the machine includes a contact sensor such as a touch probe and a non-contact sensor such as a laser measuring instrument, and is limited to the touch probe of this embodiment. is not.

  The machine having the measuring function according to the present invention is configured so that the measuring head 9 mounted on the main shaft 3 has a workpiece 7 fixed to the table 6 in a state where the measurement reference plane 2 is inclined with respect to the axis CL of the main shaft 3. An apparatus for measuring a shape, which includes a display unit 45 that displays a plurality of measurement operation directions that the measurement head 9 approaches the workpiece 7 on the screen 61, and a plurality of measurement operation directions 200 that are displayed on the screen 61. Among these, an input unit 56 to which any one measurement operation direction 200 approaching the measurement reference plane 2 of the workpiece 7 is input. Here, the measurement reference plane is a plane that serves as a reference for measuring the center position and diameter of the hole that is the measurement object, the height and width of the boss, and is the inclined plane 2 in FIG. 3, for example. is there. When one measuring operation direction 200 is input to the input unit 56, the machine approaches the measuring operation direction 200 and measures the coordinate values of three points on the measurement reference plane 2 of the workpiece 7 by the measuring head 9. Further, the machine obtains the inclination of the measurement reference plane 2 based on the measured coordinate values of the three points of the workpiece 7, and the rotational feed required to orient the measurement reference plane 2 perpendicularly to the axis CL of the main spindle 3 A calculation unit 41 for calculating the index angle of the shaft is provided. By rotating the rotary feed shaft by the indexing angle calculated by the calculation unit 41, the measurement reference surface 2 of the workpiece 7 is positioned in a posture perpendicular to the axis CL of the main shaft 3, and formed on the measurement reference surface 2. The shape such as the inner diameter of the hole is measured.

  In addition, the workpiece shape measuring method of the present invention includes an indexing step for indexing the measurement reference plane 2 of the workpiece 7 perpendicularly to the axis CL of the spindle 3 and a measuring step for measuring the shape of the workpiece 7. . In the indexing step, a step of displaying a plurality of measurement operation directions 200 that the measuring head 9 approaches the workpiece 7 on the screen 61 and a measurement reference plane 2 of the workpiece 7 from the plurality of measurement operation directions 200 on the screen. Selecting any one of the measurement motion directions 200. Further, the indexing process includes a step of measuring the coordinate values of three points on the measurement reference plane 2 of the workpiece 7 by approaching the selected measurement operation direction, and the measurement reference plane 2 based on the measured coordinate values of the three points. Calculating the index angle of the rotary feed shaft required to orient the machine perpendicular to the axis CL of the main spindle 3 of the machine, rotating the rotary feed shaft by the calculated index angle, and measuring the reference plane Positioning the workpiece 7 in a posture in which 2 is perpendicular to the axis CL of the main shaft 3.

  The measurement process subsequent to the indexing process includes a step of displaying the measurement operation process of the measurement head 9 with respect to the work 7 by a figure or a numerical value for each measurement type of position coordinates or dimensions of the work 7, and a detection signal and relative movement of the measurement head 9 Acquiring and displaying the measurement result of the position coordinates or dimensions in one measurement operation process every time one measurement operation process in one measurement type is completed from the position signal of the spindle 3 or the table 6 to be completed, and The step of changing the display of the measured operation process to a display different from the display of the measurement operation process that has not been completed, and the desired position coordinates or dimensions of the workpiece 7 are displayed after completing all the measurement operation processes for one measurement type And a step of performing.

  Hereinafter, an overall configuration of a vertical machining center 1 will be described as an embodiment of a machine having a measurement function of the present invention with reference to FIG. 1 and the like. As shown in the figure, the machining center 1 of the present embodiment is configured to be able to measure the workpiece 7 on the machine, and includes a machine body 10, a control device 13, and a display device 60. . The machine body 10 includes a bed 4 installed on the floor, a table base 5 held on the bed 4 so as to be relatively linearly movable in three axial directions orthogonal to the main shaft 3, and a table base 5 is provided with a table 6 which is rotatably held in the direction of two rotary feed axes and to which a workpiece 7 is fixed, and a main shaft 3 which holds a measuring head 9. The three orthogonal feed axes that are orthogonal to each other are the X axis, the Y axis, and the Z axis, and the two rotary feed axes are the A axis that rotates about the X axis and the C axis that rotates about the Z axis. The rotary feed shaft is not limited to the A axis and the C axis. Depending on the machine, it may have an A axis and a B axis, or may have an A axis, a B axis, and a C axis. Moreover, the structure by which the A axis | shaft, the B axis | shaft, or the C axis | shaft was provided in the main shaft side may be sufficient. The plurality of linear feed shafts and rotary feed shafts are driven by a servo motor. The main shaft 3 is provided so as to be linearly movable in the Z-axis direction on a column 8 erected on the bed 4. Although the work 7 is directly fixed to the table 6, the work 7 can be fixed to the table 6 via a fixture. FIG. 3 shows an example of the work 7 fixed to the table 6. The workpiece to be measured is not limited to the workpiece 7 of this embodiment. The lower fixed surface of the work 7 fixed to the table 6 is a flat surface, but the upper side of the work 7 has four inclined surfaces. On the inclined surface, a round hole 300 and a square boss 301 are formed perpendicular to each surface. The four inclined surfaces serve as the measurement reference surface 2 when measuring the position coordinates and dimensions of the round hole 300 and the square boss 301. Since each measurement reference plane 2 is indexed perpendicularly to the axis CL of the main shaft 3, the dimensions of the holes 300 and the like formed in the measurement reference plane 2 can be accurately measured.

  The control device 13 includes an NC device 14, a measurement operation process control unit 21, a measurement result control unit 31, and a calculation unit 41. The NC device 14 controls the relative feed operation of the apparatus body 10 via the interpolation unit 17 and the servo unit 19 according to the NC program read and interpreted by the NC program reading / interpretation unit 15. When the NC program read and interpreted by the NC program reading / interpretation unit 15 of the NC device 14 is a measurement program, a workpiece measurement operation is performed at the machining center 1, and when the NC program is a machining program, machining of the workpiece 7 is performed. Operation is performed. The measurement operation process control unit 21 is a part that provides a work program to the NC device 14 and stores measurement type selection means 23 for selecting (determining) a measurement type and a measurement program for performing shape measurement. And a measurement operation process display program storage means 27 for displaying various measurement operation processes on the screen 61 of the display device 60. The measurement program storage means 25 also stores a program for displaying the measurement operation direction of the measurement reference plane 2 for obtaining the inclination of the measurement reference plane 2 of the workpiece 7 and performing three-point measurement of the measurement reference plane 2. ing.

  The measurement result control unit 31 is a part that acquires machine coordinates with the measurement operation process control unit 21 and sends the acquired machine coordinate data to the display unit 45 and the calculation unit 41, and analyzes the measurement operation. Measurement operation analyzing means 33 for performing measurement, measurement result obtaining means 35 for obtaining measurement results such as machine coordinates of the measurement reference plane 2 measured at three positions from the same direction, and state determination means 37 for determining the state of the measurement operation. And display change means 39. The measurement result acquisition means 35 is connected via the main controller 14 from the skip signal when the probe of the measuring head 9 contacts the workpiece 7 and the current position data read by the position reading means 11 of the feed axis of the machining center 1. Get the machine coordinates when touched.

  The calculation unit 41 includes various measurement calculation units 43 that calculate position coordinates and dimensions, and an index angle calculation unit 42 that calculates an index angle of the measurement reference plane 2 from the machine coordinate data sent from the measurement result control unit 31. And a coordinate system conversion calculation means 44 for converting the measurement result into the selected coordinate system.

  The display device 60 of this embodiment includes a display unit 45 and an input unit 56. That is, in the present embodiment, the display device 60 is configured by a touch panel, and information input and output can be realized by the same device.

  As shown in the screen 61 in FIG. 2, the display unit 45 of the display device 60 is a part for displaying the data sent from the measurement result control unit 31 or the like on the screen 61, and the measurement type (measurement item). Measurement type display means 47 for displaying, measurement operation process display means 49 for displaying the measurement operation process, measurement result display means 51 for displaying the current position, etc., calculation result display means 53 for displaying the index angle, etc. and an alarm Display means 55 is provided. The measurement result display means 51 displays the machine coordinates on the screen 61 when the machine coordinates at the time of contact between the measurement head 9 and the workpiece 7 are sent from the measurement result control unit 31.

  In FIG. 2, the measurement operation process display means 49 displays a plurality of measurement operation directions 200 that the measurement head 9 approaches the measurement reference plane 2 of the workpiece 7 on the screen 61 with arrows. In the illustrated example, a figure of a rectangular parallelepiped work is shown, but a figure of the work 7 to be measured may be displayed. The operator is guided by the display of the screen 61 and can select a desired measurement operation direction 200 when determining the measurement reference plane 2 of the workpiece 7 inclined with respect to the axis CL of the main shaft 3. When the operator touches any one of the plurality of measurement operation directions 200, only the measurement operation direction 200 is highlighted (including blinking display). When an NC program start button (not shown) of the machine body 10 is pressed, the machine body 10 operates to shift the relative position of the measuring head 9 with respect to the work 7 while shifting the measurement head 9 by a predetermined distance. The coordinate values of three points existing on the surface 2 are measured by approaching the selected measurement operation direction 200, and the calculation unit 41 obtains the inclination of the measurement reference surface 2 based on the measured coordinate values of the three points. The index angles of the A axis and the C axis (the B axis does not exist in this embodiment) required to orient the measurement reference plane 2 perpendicular to the axis CL of the main shaft 3 of the machine body 10 are calculated. The index angle calculated in this way is displayed on the screen 61 together with the measurement operation direction 200. The screen 61 also displays the current machine coordinates of the rotation angles of the A axis and the C axis that are the two rotation feed axes of the machine body 10.

  The measurement reference plane 2 can be oriented perpendicularly to the axis CL of the main shaft 3 by rotating the A axis and the C axis by a manual pulse generator or jog feed or the like by the index angle displayed by the operator. Since the device according to the present invention (control device 13) has a clip function by a program, it is possible to accurately stop the rotation of the rotary feed shaft at a position corresponding to the index angle. Here, the clip function is a function for ignoring even if a program command or a further feed command is given manually when the indexing angles displayed on the A-axis and the C-axis are reached. As a result, the measurement reference plane 2 can be positioned perpendicular to the axis CL of the main shaft 3 and workability is improved. When the drawing of the workpiece 7 is displayed on the screen 61, the measurement reference plane is positioned perpendicular to the axis of the main axis, and at the same time, the figure of the workpiece 7 is displayed in accordance with the same posture. In the lower part of the screen 61, a surface index button 210 and a measurement button 211 are associated with the function keys, and by touching the measurement button 211 after indexing the measurement reference surface 2, it is shown in FIG. 4 and FIG. It is possible to switch to the measurement screen 62.

  The input unit 56 of the display device 60 includes a work item input button 57 (work item input means) for inputting whether the measurement reference plane 2 is to be indexed or measured before measurement, and the measurement reference plane 2 of the workpiece 7. A measurement type button 58 (measurement type input means) for inputting a measurement type after indexing, and a measurement operation direction input button 59 (measurement operation direction input means) for inputting the measurement operation direction 200 in the indexing operation of the measurement reference plane 2 of the workpiece 7 And have. The work item input button 57 and the measurement type input button 58 are configured by function keys at the bottom of the screen, and the measurement operation direction input button 59 is configured by an arrow on the screen 61. Since the display device 60 of the present embodiment is configured with a touch panel, it is possible to input by touching the screen 61. When the work item input button 57 is operated, a work program corresponding to the selected work item is read from the measurement operation process control unit 21. When a measurement type is input, a measurement program corresponding to the measurement type is read from the measurement operation process control unit 21.

  Next, a procedure for obtaining the center position of the hole 300 of the work 7 will be described with reference to FIG. At the bottom of the screen 62, measurement type buttons 63 such as “hole measurement”, “point measurement”, “corner measurement”, “tool length measurement”, “tool diameter measurement” and the like are displayed by the measurement type display means 47. When the “hole measurement” button is pressed, the signal is sent to the measurement type selection unit 23 of the measurement operation process control unit 21, and a measurement program for hole measurement is selected from the measurement program storage unit 25. The selected measurement program for hole measurement is sent to the NC device 14. Further, the measurement operation process for hole measurement is called from the measurement operation process display program storage means 27 and is sent to the display unit 45. An area for displaying operation buttons necessary for hole measurement, measurement results, and the like appears on the screen 62 by the measurement operation process display means 49, and the center position of the hole is obtained. A measurement operation step 69 in which four arrows are shown in the up, down, left and right directions is displayed. This arrow represents each measurement operation for bringing the measuring head 9 into contact with the workpiece 7.

  First, the measuring head 9 is positioned in the vicinity of the first measurement point 71 by using a manual pulse generator of the machining center 1 or a shaft feed by a jog switch (not shown). Next, when the “−X” button 79 is pressed, the measuring head 9 automatically approaches the workpiece 7 along the X axis at a predetermined feed speed, and returns to the original position when it contacts the first measuring point 71. Then, the color of the arrow 87 changes from black to green. This is performed via the display changing unit 39 when the measurement operation analyzing unit 33 of the measurement result control unit 31 analyzes the operation and recognizes that one measurement operation is completed. Various display changing methods such as deleting the arrow instead of changing the color of the arrow or changing the arrow to a blinking display can be adopted. Further, in the measurement result display area 95, the position coordinates of the measurement result are displayed by the functions of the measurement result acquisition unit 35 and the measurement result display unit 51.

  Next, the measurement head 9 is moved to the left side in the X-axis direction by using a manual pulse generator so as not to move in the Y-axis direction, and is positioned in the vicinity of the second measurement point 73. Then, the “+ X” button 81 is pressed to measure the position coordinates of the second measurement point 73. Similarly, the color of the arrow 89 changes from black to green. In the case of this manual operation, if it is moved in the Y-axis direction by mistake, the state discriminating means 37 judges that there is an abnormality, and a message “Measurement position is different” appears in the alarm display area 97. Displayed by working. Next, measurement of the third measurement point 75 is performed by pressing the “−Y” button 83, and the color of the arrow 91 changes from black to green. FIG. 4 shows exactly this measurement stage.

  Even if the operator does not memorize the next measurement operation at the fourth measurement point 77, the operator can immediately perform the next measurement by looking at the color change state of the graphic display in the measurement operation step 69 on the screen 62. You know what the action is. Similarly, the measurement of the fourth measurement point 77 is performed by pressing the “+ Y” button 85, and when the measurement operation is completed, the color of the arrow 77 changes from black to green, and the state determination means 37 performs all measurements of one measurement type. It is determined that the operation process is completed, and all measurement result data is sent to the calculation unit 41. Then, the calculation unit 41 calculates the center position of the circle using the calculation means 43, and the calculation result is displayed in the center position display area 99 of the screen 62. When the center coordinates are displayed in another work coordinate system, a symbol of the work coordinate system is input to the work coordinate system display area 101 and a “coordinate system selection” button 103 is pressed.

  When the center position of a circular boss (not shown) of the workpiece 7 is obtained, when the “outer circle” button 67 is pressed, the figure of the measurement operation process changes to four arrows from the outside of the circle toward the center. Further, when a line with the measurement result display area 95 is pressed and the “selection data clear” button 105 is pressed, the arrow corresponding to the measurement result changes from green to black, and at the same time, the measurement result is deleted. Then, the measurement operation can be redone. It is also possible to press the “clear all data” button 107 to redo all measurement operations.

  Next, a procedure for manually obtaining the corner position coordinates of the work 7 will be described with reference to FIG. When the “corner measurement” button is pressed among the measurement type buttons 63 at the bottom of the screen 64, the measurement type selection unit 23 of the measurement operation process control unit 21 selects a measurement program for corner measurement from the measurement program storage unit 25. It is sent to the NC device 14. Further, by calling the measurement operation process for corner measurement from the measurement operation process display program storage means 27 and sending it to the display unit 45, the measurement operation process 111 for corner measurement is displayed on the screen 64. In this case, the arrangement of the “−X” button 129, the “−Y” button 131, the “+ X” button 133, and the “+ Y” button 135 is different from the case of the hole center position measurement. When measuring the position coordinates of the lower left corner, the operator first positions the measuring head 9 near the position of the arrow 113 and presses the “−X” button 129. Then, the measuring head 9 approaches the work 7 and returns to the original position when it comes into contact. The color of the arrow 113 on the screen 64 changes from black to green. In the measurement result display area 95, the position coordinates when touching are displayed. The

  Similarly, each position coordinate is measured according to arrows 115, 117, and 119. When the state determination unit 37 determines that the four-point measurement operation has been completed, the four-point measurement result data is sent to the calculation unit 41, the corner position coordinates are calculated by the calculation unit 43, and the calculation result is displayed on the screen 64. And the origin mark 139 is displayed at the lower left corner of the measurement operation step 111. In order to display the corner position in another work coordinate system, a symbol of the work coordinate system may be input to the work coordinate system display area 101 and a “coordinate system selection” button 103 may be pressed. If the measurement is continued according to the arrows 121 and 123, the position coordinates of the lower right corner are obtained, and if the measurement is continued according to the arrows 125 and 127, the position coordinates of the upper right and upper left corners are obtained.

  When measuring a width dimension, a step dimension, and a midpoint between two surfaces (not shown) of the work 7, the “point measurement” button of the measurement type button 63 is pressed. Then, the corresponding measurement operation process is displayed on the screen 64 together with an arrow, and measurement is performed according to the instruction. Measurements such as obtaining the diameter of the circle, the angle of the corner, and the X, Y, and Z axis coordinates of the corner position can be performed in the same manner.

  In the above embodiment, since the case where the touch probe of the measurement head is used is described, the coordinate values of three points on the measurement reference plane are measured to determine the inclination of the measurement reference plane. If the displacement measurement type probe disclosed in human patent No. 1009401 and patent No. 1009403 is used, only one measurement reference plane needs to be measured. This is because the probe moves in parallel when the displacement detection axis comes into contact with the measurement reference plane and is displaced in the normal direction of the measurement reference plane. This is because the inclination of the measurement reference plane can be obtained by detecting the displacement in the X, Y, and Z axis directions at that one point.

DESCRIPTION OF SYMBOLS 1 Machining center 2 Measurement reference plane 3 Spindle 6 Table 7 Work 9 Measuring head 13 Control device 14 NC device 21 Measurement operation process control part 31 Measurement result control part 41 Calculation part 45 Display part 56 Input part 60 Display apparatus 61, 62, 64 screen

Claims (4)

In a shape measuring method for measuring the shape of a workpiece fixed to a table by a measuring head mounted on a main spindle of a machine having a linear feed shaft and a rotary feed shaft,
Displaying on the screen a plurality of measurement operation directions that the measurement head approaches the workpiece;
Selecting any one measurement operation direction that approaches the measurement reference plane of the workpiece from the plurality of measurement operation directions;
Measuring the coordinate value of at least one point on the measurement reference plane of the workpiece by approaching the selected measurement operation direction;
Calculating the index angle of the rotary feed shaft required to orient the measurement reference plane perpendicular to the axis of the machine spindle based on the measured coordinate values;
Rotating the rotary feed shaft by the calculated index angle, and positioning the measurement reference plane perpendicular to the axis of the spindle;
And measuring the shape of the workpiece.   The shape measurement according to claim 1, further comprising: measuring the shape of the workpiece with the measurement reference plane perpendicular to the axis of the main axis, and then converting the measurement result to another coordinate system and displaying the result. Method.   In the step of positioning the measurement reference plane perpendicularly to the axis of the main shaft, if the rotary feed shaft is rotated by the index angle, a function of ignoring even if a further rotary feed command is input works. The shape measuring method according to claim 1, wherein the rotation of the rotary feed shaft is stopped at a predetermined position. A measurement function comprising a linear feed shaft and a rotary feed shaft, a table for holding a workpiece, and a measurement head mounted on a spindle that moves relative to the table, and measuring the shape of the workpiece by the measurement head In a machine having
A display unit that displays on the screen a plurality of measurement operation directions that the measurement head approaches the workpiece;
Among the plurality of measurement operation directions displayed on the screen, an input unit that inputs any one measurement operation direction that approaches the measurement reference plane of the workpiece;
Based on the coordinate value of at least one point of the measurement reference plane of the workpiece measured by the measurement head approaching the workpiece in the measurement operation direction input to the input unit, the measurement reference plane is A calculation unit for calculating an indexing angle of the rotary feed shaft necessary to be oriented perpendicular to the axis of the spindle;
A machine having a measurement function characterized by comprising:

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