Bubble level characteristics
The level is mainly used to check the straightness of various machine tools and other types of equipment guides, as well as the horizontal and vertical positions of equipment installation. It can also be applied to small angle measurements and working surfaces with V-grooves. It can also measure the installation parallelism of cylindrical workpieces, as well as the horizontal and vertical positions of installation.
The bubble level is a measuring instrument used to check whether the installation surface or flat plate of a machine is level, and to measure the direction and angle of inclination. Its appearance is made of steel frame, and after precision processing, the frame base must be flat. The center of the seat surface is equipped with a glass tube with a longitudinal and circular shape, and there is also a small horizontal glass tube added at the left end. The tube is filled with ether or alcohol, and there is a small bubble left, which is always at the highest point in the tube. There are graduations on both ends of the bubbles on the glass cylinder. Usually, when installing machines in factories, the sensitivity of commonly used bubble level instruments is 0.01mm/m, 0.02mm/m, 0.04mm/m, 0.05mm/m, 0.1mm/m, 0.3mm/m, and 0.4mm/m, which means placing the level instrument on a 1m long straight gauge or flat plate. When there is a difference in sensitivity indication size at one end of the gauge or flat plate, such as a sensitivity of 0.01mm/m, it means that there is a height difference of 0.01mm at both ends of the gauge or flat plate (equivalent to a difference of 2 seconds between the two ends). When there is a height difference of h mm at one end of the 1m long gauge or flat plate, the bubble will have a difference in scale. The principle of a bubble level is to use the characteristic that bubbles can frequently remain in a high position inside a glass tube
For a certain tilt angle, in order to increase the movement of bubbles (i.e. good sensitivity), it is necessary to increase the radius of the arc (R). If the distance between each scale of the level is 2 mm and the sensitivity is 0.01 mm/m, the difference between the two ends of 1 m is 2 seconds. The bubble tube has a radius of 206.185 meters and is installed inside the frame. Different sensitivities have different radii, which are not directly related to the length of the frame.
When using a spirit level, it should be checked first. First, place the spirit level on a flat plate and read the scale size of the bubbles. Then, reverse the spirit level and place it in the same position before reading its scale size. If the readings are the same, it indicates that the relationship between the spirit level base and the bubble tube is correct. Otherwise, it is necessary to use fine-tuning screws to adjust until the readings are exactly the same before proceeding with the measurement work. If you want to check the accuracy of the spirit level, you can use a known angle size composed of a sine bar and a measuring block. At the same time, to measure a larger inclination angle, it can also be used in conjunction with a sine bar and a level.
The new level, as a substitute for the traditional bubble type tilt angle, is now more widely used in road engineering, mechanical measurement, construction engineering, industrial platforms, petroleum surveying, ships, and other situations that require tilt or horizontal angles in a gravity reference frame.
