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磨削发动机气门挺杆球面时,在挺杆球面专用磨床上若采用普通三瓣卡爪弹簧夹头(图1)装夹,磨出的挺杆球面对杆部的摆差值往往
When grinding engine valve lifter spherical surface, if the common three-jaw claw spring collet (Figure 1) clamps on the special spherical grinding machine for tappet,