To machine the workpiece shown in Figure 1 on a coordinate boring machine or milling machine, to boring d, how to ensure the margin L for the knives? According to the general method, the mandrel and the block gauge are used to perform the aligning (see Figure 1). This method has a large error, because there is always some jitter on the spindle of the machine tool. When the plug gauge is used, the gap between the spindle of the machine tool and the block gauge of each person
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