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When we were working on the tapered surface of the tractor main drive spiral bevel gear, we made a simple mastering device for turning large taper workpieces (see figure). The master support 1 is bolted to the bed body, and the mold 2 is fixed to the middle carriage. When the carriage is fed in the lathe, the master 2 fixed on the middle carriage body is driven, and the large carriage is retracted due to the oblique angle of the mold 2, that is, the taper is realized.