Detection of positioning accuracy of rotary table

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  Measuring tools include standard turntable, angle polyhedron, circular grating and collimator (collimator), etc., which can be selected according to specific conditions. The measuring method is to make the worktable rotate an angle in the forward (or reverse) direction, stop, lock, and position, use this position as the reference, then quickly rotate the worktable in the same direction, lock the position every 30, and measure. The forward rotation and the reverse rotation are measured one round each, and the larger of the difference between the actual rotation angle of each positioning position and the theoretical value (command value) is the indexing error. If it is a CNC rotary table, it should take every 30 as a target position. For each target position, fast positioning is performed 7 times from the forward and reverse directions. The difference between the actual reached position and the target position is the position deviation, and then press GB10931- The method specified in 89 "Digital Control Machine Tool Position Accuracy Evaluation Method" calculates the average position deviation and standard deviation, the sum of the larger value of all the average position deviations and standard deviations and the sum of the smaller values of all the average position deviations and standard deviations The difference is the positioning accuracy error of the CNC rotary table.

  Considering the requirements of dry-type transformers to actual use, it is generally necessary to perform key measurements on several right-angle equal points such as 0, 90, 180, and 270, and the accuracy of these points is required to be improved by one level compared with other angular positions.

 Repeated indexing accuracy detection of rotary table

  The measuring method is to repeat positioning at any three positions within a circle of the rotary table for 3 times, and perform detection under rotation in the forward and reverse directions respectively. The indexing accuracy of the larger value of the difference between all the readings and the theoretical value of the corresponding position. If it is a CNC rotary table, take one measuring point every 30 as the target position, and perform 5 rapid positioning of each target position from the forward and reverse directions respectively, and measure the difference between the actual reached position and the target position. That is, the position deviation, and then calculate the standard deviation according to the method specified in GB10931-89. The 6 times the larger value of the standard deviation of each measuring point is the repeat indexing accuracy of the CNC rotary table.