How to use the bubble level? What are the points of attention?


Release time:

2022-09-13

Bubble level is a common measuring tool for measuring small angles. In the machinery industry and instrument manufacturing, it is used to measure the inclination angle relative to the horizontal position, the flatness and straightness of the machine tool guide rail, the horizontal position and vertical position of the equipment installation, etc. Let's see how the bubble level works. Need to pay attention to what?

How to use the bubble level? What are the points of attention?

Bubble level is a common measuring tool for measuring small angles. In the machinery industry and instrument manufacturing, it is used to measure the inclination angle relative to the horizontal position, the flatness and straightness of the machine tool guide rail, the horizontal position and vertical position of the equipment installation, etc. Let's see how the bubble level works. Need to pay attention to what?

1. The two V-shaped measuring surfaces of the bubble level are the benchmark for measurement accuracy, and cannot contact or rub with the rough surface of the workpiece during measurement. Please handle it with care when placing it, so as not to damage the level gauge and cause unnecessary measurement errors due to scratches on the measuring surface.

2. When measuring the vertical surface of the workpiece with the bubble level, the part cannot be held against the auxiliary surface, but the vertical surface of the workpiece must be pushed hard, which will affect the measurement accuracy due to the deformation of the level. The correct measurement method is to hold the inner side of the auxiliary measuring surface by hand, so that the level is stably and vertically attached to the vertical surface of the workpiece (adjust the bubble in the middle position), and then read the number of bubbles moving from the vertical surface.

3. When using the bubble level, ensure that the working surface of the bubble level and the surface of the workpiece are clean to prevent dirt from affecting the measurement accuracy. When measuring the horizontal plane, adjust the level in the direction opposite to the measuring front at the same measuring position. When moving the level, the working surface of the level is not allowed to rub against the surface of the workpiece, and it should be lifted and placed.

4. When measuring a large length workpiece, the workpiece can be evenly divided into several size segments, and then draw an error coordinate chart according to the measurement readings of each segment to determine the number of large errors. When checking the straightness of the bed rail on the vertical plane, place the square level longitudinally on the tool holder near the front rail. Starting from the tool holder position at one end of the headstock, move the tool holder from left to right, each time the distance should be approximately equal to the boundary ruler of the level (200mm). Record the carriage level reading for each measured length position in turn. Arrange these readings in turn, and draw the straightness error curve of the guide rail on the vertical plane according to the appropriate proportion. The reading of the level is the ordinate. Take the reading of the level at the starting position of the tool holder as the starting point, and make a dotted line segment from the origin of coordinates. After each reading, the end point of the previous broken line segment is taken as the starting point, and the line segment to be broken is drawn. The curve formed by each dashed segment is the straightness curve of the guide rail in the vertical plane. The large coordinate value of the curve relative to the connecting line at both ends of the curve is the straightness error of the full length of the guide rail, and the coordinate difference of the connecting line at both ends of the curve relative to the two ends of the curve within any local measured length of the curve is the local error of the guide rail.

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