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在孔内车削大螺距的方牙或梯形螺纹时,采用如图所示的装置是大有帮助的。两把完全相同的可调镗杆装在快换刀架上,分别装夹粗加工
In the hole turning large pitch square or trapezoidal thread, the use of the device shown in the figure is very helpful. Two identical adjustable boring bar mounted on the quick tool changer, respectively, clamping roughing