When the vertical car is machining in the diameter direction of the workpiece, because there is no reference zero position, the workpiece should be tested before each tool or after the tool change to determine the starting point. After the digital display is installed, the positive digital display is set to zero after the test, and then the workpiece size is measured to determine the infeed amount and then the infeed, thereby indirectly reaching the required size of the drawing. If the tool is worn or replaced, the vehicle needs to be re-tested. Very labor-intensive, but also due to the size chain
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