When we drill the drill shaft (Fig. 1), we use the frame type tool holder (Fig. 2). The adjustment is time-consuming and the effect is not good. Therefore, instead of assembling the tool holder (Fig. 3), the overall shape is much reduced. The washer 2 adopts an adjustable structure. For different specifications, it is only necessary to replace the corresponding washer and mandrel to meet the processing requirements and shorten the processing. Manufacturing cycle.
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