How to use the infrared level meter
The overall size of the general frame level is 200×200mm, and the accuracy is 0.02/1000. The scale value of the level is the inclination of the bubble when it moves one grid, in seconds or in millimeters per meter. The scale value is also called reading accuracy or sensitivity. If the level is placed on the surface of a 1-meter-long flat ruler, and a height of 0.02 mm is placed on the right end, the tilt angle of the flat ruler is 4 seconds, and the moving distance of the bubble is exactly one scale at this time.
The calculation is as follows: the inclination angle α of the level meter together with the ruler can be obtained from the following formula:
From tgα= = =0.00002, then α=4 seconds
From the above formula, it can be known that the bubble of the frame-type level with 0.02/1000 precision moves one scale, and its inclination angle is equal to 4 seconds. At this time, at a distance of 200mm from the left end (equivalent to one side length of the level), calculate the height below the level ruler H1 is:
tgα= =0.00002 H1=tgα×L1=0.00002×200=0.004(mm)
It can be seen from the above formula that the actual change value of the level bubble is related to the length of the used level horn. If the level is placed on a 500mm long shim to measure the guide rail of the machine tool, then every time the bubble of the level moves by 1 grid, it means that the height difference between the two ends of the shim is 0.01mm. In addition, the actual change value of the level meter is also related to the reading accuracy. Therefore, when using a spirit level, you must pay attention to the length of the horn, the reading accuracy, and the real value represented by the movement of the bubble when it is used alone.
From this we know that the value of the level after the air bubble moves one grid is determined according to the length of the horn.
The reading of the level meter should be 0 according to any grid of its starting point. The count of bubble movement is 1, and the count of bubble movement is 2, so as to accumulate. In the final processing of guide rails in actual production, whether grinding, fine grinding or manual scraping is used, most guide rails are in a state of simple convexity or simple concave, and it is rare for the straightness of machine tool guideways to produce curves (before processing The guide rail will have a curved phenomenon). When measuring the guide rail, the bubble of the level generally moves in one direction, and the convexity of the guide rail of the machine tool is determined by the moving direction of the level and the moving direction of the bubble.
The direction of movement of the level is opposite to that of the bubbles, which is convex and represented by the symbol "+".
The moving direction of the level is the same as that of the air bubbles, which is concave and represented by the symbol "-".
If the guide rail is convex, the level (horn) moves from any direction, and the air bubble of the level moves in the opposite direction.
If the guide rail is concave, the level (horn) moves from any direction, and the air bubbles of the level move in the same direction.
After determining the concave and convex of the guide rail, calculate according to the half of the sum of the length of the shim iron used and the bubble movement grid number of the level meter, so as to obtain the accurate straightness error accuracy of the guide rail.
