WPC Fencing,Balcony Commercial WPC,Composite Floating Port WPC Decking Co., Ltd. , http://www.hswpcdecking.com The six-cranked crankshaft processed by our factory is shown in Figure 1. The process arranges the fourth main journal (the journal in the middle of the 6 and 7 crank arms) with a crankshaft lathe. However, the phenomenon of "snapping knife" often occurs during the processing, which causes the T-shaped bolt of the fixed tool holder to break the dovetail groove, which seriously affects production. At the same time, the fourth main journal is processed, and the round jump is very large, which does not meet the technical requirements.