Instrument measurement of level
1. The two V-shaped measuring surfaces of the level are the benchmark for measurement accuracy, and cannot come into contact or friction with the rough surface of the work during measurement. When placing, care must be taken to avoid damaging the level gauge and causing unnecessary measurement errors due to scratches on the measuring surface.
2. When measuring the vertical plane of the workpiece with a level gauge, it is not possible to hold the part opposite the secondary side, but to push and press towards the vertical plane of the workpiece with force. This will affect the accuracy of the measurement due to the deformation of the level gauge under force. The correct measurement method is to hold the inner side of the secondary measuring surface with your hand, so that the level is smoothly and vertically (adjust the bubble to be in the middle position) attached to the vertical plane of the workpiece, and then read the number of bubbles moving from the longitudinal level.
3. When using a level, it is necessary to ensure the cleanliness of the working surface of the level and the surface of the workpiece to prevent dirt from affecting the accuracy of the measurement. When measuring the horizontal plane, at the same measuring position, the level should be adjusted in the opposite direction before measurement. When moving the level, friction between the working surface of the level and the surface of the workpiece is not allowed, and it should be lifted and placed. Instrument measurement with a level gauge
4. When measuring a workpiece with a larger length, the workpiece can be evenly divided into several size segments, and the segmented measurement method can be used. Then, based on the measurement readings of each segment, an error coordinate map can be drawn to determine the * large grid number of its error. When checking the straightness of the bed guide rail in the longitudinal vertical plane, place the box level gauge longitudinally on the tool holder near the front guide rail. Starting from the extreme position of the tool holder at one end of the spindle box, move the tool holder from left to right, and each movement distance should be approximately equal to the border ruler (200mm) of the level gauge. Record the level readings of the tool holder at each measurement length position in sequence. Arrange these readings in sequence and draw the straightness error curve of the guide rail in the vertical plane with appropriate proportions. The reading of the level gauge is the vertical coordinate, and the reading of the level gauge when the tool holder is in the starting position is the starting point. A folded line segment is made from the coordinate origin, and each subsequent reading takes the endpoint of the previous folded line segment as the starting point. The line segment that should be folded is drawn, and the curve formed by each folded line segment is the straightness curve of the guide rail in the vertical plane. The * coordinate value of the curve relative to the connecting line at its two ends is the straightness error of the entire length of the guide rail, and the difference in coordinates between the two ends within any local measurement length on the curve relative to the connecting line at both ends of the curve is also the local error of the guide rail.
5. The flatness inspection method for the machine tool workbench is to place the workbench and bed saddle in the middle of the stroke, place a bridge board on the workbench, and place a level gauge on it. Move the bridge board in each measurement direction as shown in the diagram, and record the level gauge reading every span d of the bridge board. Establish a reference plane through points A, B, and D on the workbench, and obtain the coordinate values of each measuring point plane based on the readings of the level gauge.
6. When measuring the verticality of large parts, use a level to roughly adjust the reference surface to the horizontal. Measure the reference surface and the measured surface step by step using a level and determine the reference orientation using graphical method, and then calculate the perpendicularity error of the measured surface relative to the reference.
When measuring small parts, first place a level gauge on the reference surface, read the value at one end of the bubble, and then use one side of the level gauge to tightly adhere to the vertical surface to be measured. The deviation of the bubble from the first reading (reference surface) is the verticality error of the measured surface.
