Ultraviolet Lamp,Pll Uvc Tube,Pll Uvc Light,Pll Uvc Bulb Changxing leboom lighting product CO.Ltd. , https://www.leboomuvd.com Figure 1 shows the left and right knuckle arms of the front axle assembly of our factory. In the figure, 2×φ38mm is required to level and ensure the size is 33mm. The original process is to position two holes with A face and 2×φ19mm, and process with a single boring tool on the vertical drill. Since the pupil is machined on the arc surface of R40mm, the countersunk hole is easy to deviate from the center line and cannot guarantee production.