Measurement device and method for radial and axial runout of railway wheelset wheel tread

Abstract

This invention relates to a device for measuring the radial and axial runout of railway wheelset wheel treads. The device includes an inverted V-shaped base, a vertical ruler sleeve, a vertical ruler, a horizontal ruler, a radial runout indicator, a radial runout measuring wheel, an axial runout indicator base, an axial runout indicator, an axial runout measuring wheel, an axle end positioning transverse slide, an axle end positioning assembly, and an axle shoulder positioning assembly. The vertical ruler sleeve is connected to the top of the inverted V-shaped base, and the vertical ruler is connected within the vertical ruler sleeve. The horizontal ruler is perpendicularly connected to the upper end of the vertical ruler. The radial runout indicator is connected to the horizontal ruler. The axial runout indicator base is connected to the end of the horizontal ruler, and the axial runout indicator is connected to the axial runout indicator base. The axle end positioning transverse slide is installed in a sliding hole in the inverted V-shaped base, with both ends protruding from both sides of the inverted V-shaped base. The axle end positioning assembly and the axle shoulder positioning assembly are respectively connected to the two ends of the axle end positioning transverse slide. Using this invention, the radial and axial runout values ​​of the wheel tread can be measured quickly and accurately, with high measurement efficiency.

Description

Technical Field

[0001] This invention relates to a measuring instrument, and more particularly to a measuring device and method for measuring the radial and end face runout of railway wheelset wheel treads. Background Technology

[0002] The railway wheel tread refers to the contact area between the wheel and the working surface of the rail. To ensure smooth operation of the wheelset on the rail, successful passage through curves, reduced wheel wear, and extended wheel mileage, the tread should have a reasonable shape; therefore, it needs to be measured. In my country's railway vehicle industry, a wheel tread runout measuring instrument (TB / T2456.8-1993) can be used to detect wheel tread runout. While this instrument can perform the detection function, it requires two people to operate: one to hold the measuring instrument and the other to rotate the wheel, which is labor-intensive and inefficient. Furthermore, it cannot simultaneously measure the radial and axial runout values ​​of the tread. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies of the existing technology by providing a device and method for measuring the radial and end face runout of railway wheelset treads, which can quickly and accurately measure the radial and end face runout values ​​of the wheel treads with high measurement efficiency.

[0004] The technical solution adopted by this invention to achieve the above objectives is: a measuring device for radial and axial runout of railway wheelset wheel treads, comprising an inverted V-shaped seat, a vertical ruler sleeve, a vertical ruler, a horizontal ruler, a radial runout indicator, a radial runout measuring wheel, an axial runout indicator seat, an axial runout indicator, an axial runout measuring wheel, a shaft end positioning transverse slide, a shaft end positioning assembly, and a shaft shoulder positioning assembly. The inverted V-shaped seat is an integrally inverted V-shaped positioning frame. The vertical ruler sleeve is connected to the top of the inverted V-shaped seat and extends upwards in the vertical direction. The vertical ruler is connected to the vertical ruler sleeve by a vertical ruler locking screw. The horizontal ruler is vertically connected to the upper end of the vertical ruler and extends horizontally to one side. The radial runout indicator is connected to the horizontal ruler with the probe facing downwards by an indicator locking screw. The radial runout... The measuring wheel is connected to the end of the probe of the radial runout indicator. The end face runout indicator base is connected to the end of the horizontal ruler away from the vertical ruler and extends vertically downward. The end face runout indicator is connected to the end face runout indicator base by the indicator locking screw. The probe of the end face runout indicator extends vertically towards the side where the vertical ruler is located. The end face runout measuring wheel is connected to the end of the probe of the end face runout indicator. The inverted V-shaped base has a sliding hole in the middle. The shaft end positioning transverse slide is installed in the sliding hole of the inverted V-shaped base by the locking screw and its two ends protrude from both sides of the inverted V-shaped base. The shaft end positioning assembly is vertically connected to the lower side of the shaft end positioning transverse slide away from the end face runout indicator base. The shaft shoulder positioning assembly is vertically connected to the end of the shaft end positioning transverse slide near the end face runout indicator base.

[0005] A further technical solution of the present invention is: the inverted V-shaped seat includes two inverted V-shaped positioning frames arranged side by side, and a handle is connected between the upper middle parts of the two inverted V-shaped positioning frames. The two inverted V-shaped positioning frames are connected to form an integral structure by the handle, and the vertical ruler sleeve is connected to the upper middle part of one of the inverted V-shaped positioning frames.

[0006] A further technical solution of the present invention is: the bottom end of the inverted V-shaped positioning frame is respectively connected to a downwardly extending support leg, and a balance block is connected between adjacent support legs.

[0007] A further technical solution of the present invention is: the sliding hole horizontally penetrates the middle of the two inverted V-shaped positioning frames respectively, and the shaft end positioning transverse sliding ruler is assembled in the sliding hole and its two ends protrude outward from the two inverted V-shaped positioning frames respectively.

[0008] A further technical solution of the present invention is: each inverted V-shaped positioning frame includes two inclined positioning arms, and two symmetrically arranged guide rods are connected between the positioning arms of adjacent inverted V-shaped positioning frames, with two journal positioning wheels fitted on each guide rod.

[0009] A further technical solution of the present invention is: the shaft end positioning assembly includes a shaft end positioning longitudinal slide and a shaft end positioning wheel. The shaft end positioning longitudinal slide is connected to the lower side of the end of the shaft end positioning transverse slide away from the end face jump gauge seat by a locking screw. The shaft end positioning wheel is connected to the bottom end of the shaft end positioning longitudinal slide.

[0010] A further technical solution of the present invention is: the shoulder positioning assembly includes a shoulder positioning vertical ruler and a shoulder positioning wheel. The shoulder positioning vertical ruler is connected to the end of the shaft end positioning horizontal slide ruler near the end face jump gauge seat by a locking screw. The shoulder positioning wheel is connected to the bottom end of the shoulder positioning vertical ruler.

[0011] A further technical solution of the present invention is: a tread positioning claw is connected to the lower side of one end of the horizontal ruler near the end face of the jumping gauge base, and the tread positioning claw is a foldable positioning claw that can be folded upward.

[0012] Another technical solution adopted by the present invention to achieve the above-mentioned objective is: a measurement method using the above-mentioned railway wheelset wheel tread radial and end face runout measuring device, comprising the following steps: (i) placing the inverted V-shaped seat of the measuring device on the wheelset journal: the inverted V-shaped positioning frame is positioned on the upper side of the wheelset journal, the support feet are positioned on the outer edges of both sides of the wheelset journal, and the balance block is on the lower side of the wheelset journal; (ii) moving the measuring device to make the tread positioning claw contact the tread; if the axle has no axle shoulder, pushing the axle end positioning transverse slide to make the axle end positioning wheel contact the axle end, adjusting the axle end positioning longitudinal slide up and down to the appropriate position and locking the locking screw; if the axle has axle shoulder (ii) Push the horizontal sliding ruler of the shaft end positioning so that the shaft shoulder positioning wheel contacts the shaft shoulder, adjust the vertical ruler of the shaft shoulder positioning to the appropriate position and lock the locking screw; (iii) Adjust the height of the vertical ruler so that the radial runout measuring wheel contacts the wheel set tread surface and lock the vertical ruler locking screw, and zero the radial runout indicator; adjust the end face runout indicator so that the end face runout measuring wheel contacts the inner side of the wheel and lock the end face runout indicator, zero the end face runout indicator value, rotate the tread positioning claw 90 degrees so that it folds and disengages from the tread surface; (iv) Rotate the wheel set wheel one revolution, read the radial runout from the radial runout indicator, and read the end face runout from the end face runout indicator.

[0013] The radial and axial runout measuring device and method for railway wheelset wheel treads of the present invention have the following beneficial effects: 1. A radial runout indicator is set on a horizontal ruler, and an axial runout indicator is installed on the front end of the horizontal ruler. This allows for simultaneous measurement of radial and axial runout values, resulting in high measurement efficiency. 2. Due to the inverted V-shaped seat that can be quickly and stably positioned on the journal, and a balance block connected to the lower side of the inverted V-shaped seat support, the inverted V-shaped seat can stably fit against the journal surface under the gravity of the balance block. The measurement process only requires rotating the wheelset wheel one revolution to quickly read the radial runout amount, which is convenient to operate, has good stability, and high measurement accuracy. 3. One end of the axle end positioning transverse slide is connected to the axle end positioning component, and the other end is connected to the axle shoulder positioning component. This allows for quick measurement regardless of whether the axle has an axle shoulder, making it highly versatile.

[0014] The following description, in conjunction with the accompanying drawings and embodiments, further illustrates the radial and end-face runout measuring device and method for railway wheelset treads according to the present invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the railway wheelset wheel tread radial and end face runout measuring device of the present invention;

[0016] Figure 2 yes Figure 1 Right view of the measuring device shown (shoulder positioning assembly omitted);

[0017] Figure 3 yes Figure 1An enlarged view of the inverted V-shaped base of the measuring device shown and the components connected to it;

[0018] Figure 4 yes Figure 1 An enlarged view of the measuring device's ruler and its connected components;

[0019] Figure 5 This is a schematic diagram of measuring the radial and end face runout of the wheel tread of a railway wheelset using the measuring device of the present invention;

[0020] Figure 6 yes Figure 5 A magnified view of a portion of the document;

[0021] Explanation of reference numerals: 1-Shaft end positioning wheel, 2-Shaft end positioning longitudinal slide bar, 3-Locking screw, 4-Shaft end positioning transverse slide bar, 5-Handle, 6-Vertical ruler sleeve, 7-Vertical ruler locking screw, 8-Vertical ruler, 9-Horizontal ruler, 10-Radial runout indicator, 11-Indicator locking screw, 12-Radial runout measuring wheel, 13-Tread positioning claw, 14-End face runout indicator seat, 15-End face runout indicator, 16-End face runout measuring wheel, 17-Shaft shoulder positioning vertical ruler, 18-Guide rod, 19-Shaft shoulder positioning wheel, 20-Junior journal positioning wheel, 21-Support leg, 22-Balance block, 23-Inverted V-shaped seat, 24-Inverted V-shaped positioning frame, 25-Positioning arm, 26-Tread, 27-Junior journal, 28-Inner side of wheel, 29-Wheel. Detailed Implementation

[0022] like Figures 1 to 4 As shown, the radial and axial runout measuring device for railway wheelset wheel treads of the present invention includes an inverted V-shaped seat 23, a vertical ruler sleeve 6, a vertical ruler 8, a horizontal ruler 9, a radial runout indicator 10, a radial runout measuring wheel 12, an axial runout indicator seat 14, an axial runout indicator 15, an axial runout measuring wheel 16, a shaft end positioning transverse sliding ruler 4, a shaft end positioning assembly, and a shaft shoulder positioning assembly.

[0023] like Figure 1 , Figure 2As shown, the inverted V-shaped seat 23 is an overall inverted V-shaped positioning frame. In this embodiment, the inverted V-shaped seat 23 includes two inverted V-shaped positioning frames 24 arranged side by side, with the two inverted V-shaped positioning frames 24 arranged parallel to each other at intervals. A handle 5 is connected between the upper middle parts of the two inverted V-shaped positioning frames 24, and the two inverted V-shaped positioning frames 24 are connected to form an integral structure through the handle 5. The handle 5 can lift the measuring device as a whole. Each inverted V-shaped positioning frame 24 includes two inclined positioning arms 25. Two symmetrically arranged guide rods 18 are connected between the positioning arms 25 of adjacent inverted V-shaped positioning frames 24, that is, a guide rod 18 is connected between the positioning arms 25 on each side. The guide rods 18 on both sides of the positioning arms 25 are symmetrically arranged. Two journal positioning wheels 20 are sleeved on each guide rod 18. During measurement, the journal positioning wheels 20 can be positioned on the surface of the journal 27. Setting the journal positioning wheels 20 allows for smoother rotation of the wheel-to-wheel pair during measurement. The bottom of the inverted V-shaped positioning frame 24 is connected to a downwardly extending support leg 21. The upper end of the support leg 21 is connected to the lower end of each positioning arm 25. A balance block 22 is connected between adjacent support legs 21. The balance block 22 is connected between the bottom support legs 21 of the same inverted V-shaped positioning frame 24 and between the bottom support legs 21 of adjacent inverted V-shaped positioning frames 24. The balance block 22 can balance the overall weight of the measuring device on the inverted V-shaped seat 23.

[0024] like Figure 1 , Figure 3As shown, a sliding hole is provided in the middle of the inverted V-shaped seat 23. The shaft end positioning transverse slide 4 is installed in the sliding hole of the inverted V-shaped seat 23 by locking screws 3, with both ends protruding from both sides of the inverted V-shaped seat 23. In this embodiment, the sliding hole horizontally penetrates the middle of the two inverted V-shaped positioning frames 24, and the shaft end positioning transverse slide 4 is assembled in the sliding hole with both ends protruding from the outer sides of the two inverted V-shaped positioning frames 24. The position of the shaft end positioning transverse slide 4 in the sliding hole can be adjusted by adjusting the locking screws 3. The shaft end positioning assembly is vertically connected to the lower side of the end of the shaft end positioning transverse slide 4 away from the end face runout gauge 14, and the shaft shoulder positioning assembly is vertically connected to the end of the shaft end positioning transverse slide 4 near the end face runout gauge 14. The shaft end positioning assembly includes a shaft end positioning longitudinal slide 2 and a shaft end positioning wheel 1. The shaft end positioning longitudinal slide 2 is connected to the lower side of the end of the shaft end positioning transverse slide 4 away from the end face runout gauge 14 by a locking screw 3. The locking screw 3 allows adjustment of the vertical position of the shaft end positioning longitudinal slide 2. The shaft end positioning wheel 1 is connected to the bottom end of the shaft end positioning longitudinal slide 2, and its surface can be positioned relative to the shaft end surface. The shaft shoulder positioning assembly includes a shaft shoulder positioning vertical ruler 17 and a shaft shoulder positioning wheel 19. The shaft shoulder positioning vertical ruler 17 is connected to the end of the shaft end positioning transverse slide 4 near the end face runout gauge 14 by a locking screw. The locking screw 3 allows adjustment of the vertical position of the shaft shoulder positioning vertical ruler 17. The shaft shoulder positioning wheel 19 is connected to the bottom end of the shaft shoulder positioning vertical ruler 17 and is used for positioning relative to the shaft shoulder surface. The axle end positioning transverse slide bar 4 can slide back and forth in the sliding hole of the inverted V-shaped seat 23 and be locked by the locking screw 3. If the wheelset being measured has an axle shoulder, the axle shoulder positioning wheel 19 is used to position the axle shoulder. If the wheelset being measured does not have an axle shoulder, the axle end positioning wheel 1 is used to position the axle end.

[0025] like Figures 1 to 4 As shown, the vertical ruler sleeve 6 is connected to the top of the inverted V-shaped seat 23 and extends upward in the vertical direction. The vertical ruler sleeve 6 is connected to the upper middle part of one of the inverted V-shaped positioning frames 24. In this embodiment, as... Figure 1As shown, the vertical ruler sleeve 6 is connected to the upper middle part of the inverted V-shaped positioning frame 24 located on the right. The vertical ruler 8 is connected to the vertical ruler sleeve 6 by the vertical ruler locking screw 7, and the height of the vertical ruler 8 can be adjusted by the vertical ruler locking screw 7. The horizontal ruler 9 is vertically connected to the upper end of the vertical ruler 8 and extends horizontally to one side. The radial runout indicator 10 is connected to the horizontal ruler 9 with the probe facing downward by the indicator locking screw 11. The radial runout measuring wheel 12 is connected to the end of the probe of the radial runout indicator 10. A tread positioning claw 13 is connected to the lower side of the end of the horizontal ruler 9 near the end face runout base 14. The tread positioning claw 13 is a foldable positioning claw that can be folded upward. Before measurement, the tread positioning claw 13 can be positioned on the tread 26. During measurement, the tread positioning claw 13 can be folded. The end face runout base 14 is connected to the end of the horizontal ruler 9 away from the vertical ruler 8 and extends vertically downward. The end face runout indicator 15 is connected to the end face runout base 14 through the indicator locking screw 11. The probe of the end face runout indicator extends vertically toward the side where the vertical ruler 8 is located. The end face runout measuring wheel 16 is connected to the end of the probe of the end face runout indicator 15.

[0026] This invention provides a measurement method for the radial and axial runout of railway wheelset wheel treads using the aforementioned railway wheelset wheel tread radial and axial runout measuring device, as follows: Figure 5 , 6As shown, the procedure includes the following steps: (a) First, install the radial runout indicator 10 on the horizontal ruler 9, and the end face runout indicator 15 on the end face runout indicator base 14. Then, place the inverted V-shaped seat 23 of the measuring device onto the wheelset journal 27. The inverted V-shaped positioning frame 24 is positioned on the upper side of the wheelset journal 27, the support legs 21 are positioned on the outer edges of both sides of the wheelset journal 27, and the balance block 22 is on the lower side of the wheelset journal 27. Under the weight of the balance block 22, the inverted V-shaped seat 23... The inner journal positioning wheel 20 can fit tightly against the surface of the journal 27; (ii) Move the measuring device to make the tread positioning claw 13 contact the tread 26. If the axle has no shoulder, push the axle end positioning transverse slide 4 to make the axle end positioning wheel 1 contact the axle end, adjust the axle end positioning longitudinal slide 2 up and down to the appropriate position and lock the locking screw; if the axle has a shoulder, push the axle end positioning transverse slide 4 to make the shoulder positioning wheel 19 contact the shoulder, adjust the shoulder positioning vertical slide 17 up and down to the appropriate position. Position the wheel axle in the appropriate position and tighten the locking screw; In this embodiment, the wheel axle with a shoulder is measured. Therefore, in the case of a wheel axle with a shoulder, push the axle end positioning transverse slide 4 inward so that the axle shoulder positioning wheel 19 contacts the axle shoulder. Adjust the axle shoulder positioning vertical ruler 17 up and down to the appropriate position (the axle shoulder positioning wheel 19 can be stably against the axle shoulder surface) and tighten the locking screw 3; (iii) Adjust the height of the vertical ruler 8 so that the radial runout measuring wheel 12 contacts the wheel set tread surface 26 and tighten the vertical ruler locking screw 7. Zero the radial runout indicator 10; Adjust the end face runout indicator 15 so that the end face runout measuring wheel 16 contacts the inner side 28 of the wheel and tighten the end face runout indicator 15. Zero the value of the end face runout indicator 15 and rotate the tread positioning claw 1390 degrees so that it folds and disengages from the tread surface 26; (iv) Rotate the wheel set wheel 29 one turn and read the radial runout from the radial runout indicator and the end face runout from the end face runout indicator 15.

[0027] The above embodiments are merely preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for measuring radial and axial runout of railway wheelset wheel tread, characterized in that, The system includes an inverted V-shaped base (23), a vertical ruler sleeve (6), a vertical ruler (8), a horizontal ruler (9), a radial runout indicator (10), a radial runout measuring wheel (12), an end face runout indicator base (14), an end face runout indicator (15), an end face runout measuring wheel (16), a shaft end positioning transverse slide (4), a shaft end positioning assembly, and a shaft shoulder positioning assembly. The inverted V-shaped base (23) is an integrally inverted V-shaped positioning frame. The vertical ruler sleeve (6) is connected to the top of the inverted V-shaped base (23) and extends upward in the vertical direction. The vertical ruler (8) is connected to the vertical ruler sleeve (6) by a vertical ruler locking screw (7). The horizontal ruler (9) is vertically connected to the upper end of the vertical ruler (8) and extends horizontally to one side. The radial runout indicator (10), a radial runout measuring wheel (12), a radial runout measuring wheel (14), an end face runout indicator (15), an end face runout measuring wheel (16), a shaft end positioning transverse slide (4), a shaft end positioning assembly, and a shaft shoulder positioning assembly. The runout indicator (10) is connected to the horizontal ruler (9) with the probe facing downwards via the indicator locking screw (11). The radial runout measuring wheel (12) is connected to the end of the probe of the radial runout indicator (10). The end face runout base (14) is connected to the end of the horizontal ruler (9) away from the vertical ruler (8) and extends vertically downwards. The end face runout indicator (15) is connected to the end face runout base (14) via the indicator locking screw (11). The probe of the end face runout indicator (15) extends vertically towards the side where the vertical ruler (8) is located. The end face runout measuring wheel (16) is connected to the end of the probe of the end face runout indicator (15). The inverted V-shaped seat (23) has a sliding hole in the middle. The shaft end is fixed. The horizontal sliding ruler (4) is installed in the sliding hole of the inverted V-shaped seat (23) by locking screws (3) and both ends protrude from the two sides of the inverted V-shaped seat (23). The shaft end positioning assembly is vertically connected to the lower side of the end of the shaft end positioning horizontal sliding ruler (4) away from the end face jump gauge seat (14). The shaft shoulder positioning assembly is vertically connected to the end of the shaft end positioning horizontal sliding ruler (4) near the end face jump gauge seat (14). The inverted V-shaped seat (23) includes two inverted V-shaped positioning frames (24) arranged side by side. A handle (5) is connected between the upper middle parts of the two inverted V-shaped positioning frames (24). The two inverted V-shaped positioning frames (24) are connected by the handle (5) to form an integral structure. The vertical ruler sleeve (6) is connected to one of them. The upper part of the inverted V-shaped positioning frame (24) is connected; the shaft end positioning assembly includes a shaft end positioning longitudinal slide (2) and a shaft end positioning wheel (1). The shaft end positioning longitudinal slide (2) is connected to the lower side of the end of the shaft end positioning transverse slide (4) away from the end face jump table base (14) by a locking screw (3). The shaft end positioning wheel (1) is connected to the bottom end of the shaft end positioning longitudinal slide (2); the shaft shoulder positioning assembly includes a shaft shoulder positioning vertical ruler (17) and a shaft shoulder positioning wheel (19). The shaft shoulder positioning vertical ruler (17) is connected to the end of the shaft end positioning transverse slide (4) near the end face jump table base (14) by a locking screw (3). The shaft shoulder positioning wheel (19) is connected to the bottom end of the shaft shoulder positioning vertical ruler (17).

2. The railway wheelset wheel tread radial and axial runout measuring device as described in claim 1, characterized in that, The bottom of the inverted V-shaped positioning frame (24) is connected to a downwardly extending support leg (21), and a balance block (22) is connected between adjacent support legs (21).

3. The railway wheelset wheel tread radial and axial runout measuring device as described in claim 1, characterized in that, The sliding holes pass horizontally through the middle of the two inverted V-shaped positioning frames (24), and the shaft end positioning transverse sliding ruler (4) is assembled in the sliding holes and protrudes from the outside of the two inverted V-shaped positioning frames (24) at both ends.

4. The railway wheelset wheel tread radial and axial runout measuring device as described in claim 1, characterized in that, Each inverted V-shaped positioning frame (24) includes two inclined positioning arms (25). Two symmetrically arranged guide rods (18) are connected between the positioning arms (25) of adjacent inverted V-shaped positioning frames (24). Each guide rod (18) is fitted with two journal positioning wheels (20).

5. The railway wheelset wheel tread radial and axial runout measuring device as described in claim 1, characterized in that, The horizontal ruler (9) is connected to a tread positioning claw (13) on the lower side of the end face of the jumping table base (14). The tread positioning claw (13) is a foldable positioning claw that can be folded upwards.

6. A measurement method using the radial and axial runout measuring device for railway wheelset wheel treads as described in any one of claims 1-5, characterized in that, The steps include: (i) placing the inverted V-shaped seat (23) of the measuring device onto the wheelset journal (27): the inverted V-shaped positioning frame (24) is positioned on the upper side of the wheelset journal (27), the support feet (21) are positioned on the outer edges of both sides of the wheelset journal (27), and the balance block (22) is on the lower side of the wheelset journal (27); (ii) moving the measuring device to make the tread positioning claw (13) contact the tread (26). If the axle has no shoulder, push the axle end positioning transverse slide (4) to make the axle end positioning wheel (1) contact the axle end, adjust the axle end positioning longitudinal slide (2) up and down to the appropriate position, and lock the locking screw (3); if the axle has a shoulder, push the axle end positioning transverse slide (4) to make the shoulder positioning wheel (19) contact the shoulder, and adjust the shoulder positioning wheel up and down. (iii) Adjust the height of the vertical ruler (8) so that the radial runout measuring wheel (12) contacts the wheel tread (26) and tighten the vertical ruler locking screw (7). Zero the radial runout indicator (10). Adjust the end face runout indicator (15) so that the end face runout measuring wheel (16) contacts the inner side of the wheel (28) and tighten the end face runout indicator (15). Zero the value of the end face runout indicator (15). Rotate the tread positioning claw (13) 90 degrees so that it folds and disengages from the tread (26). (iv) Rotate the wheel tread (29) one revolution and read the radial runout from the radial runout indicator (10) and the end face runout from the end face runout indicator (15).

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