The LW_3-101II electric mechanism produced by our factory has a driving plate part, the shape is shown in Figure 1, and the material is steel casting. The processing of the keyway in the hole has been processed on the in-line cutting device, but the manufacturing cost is increased due to the time-consuming processing. Later we saw "Mechanical Workers" (Cold Processing) on ​​"Machining Keyways"
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Yucheng Weisite Measuring Tools Co., Ltd , https://www.wsttools.com