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如图是在立车或镗铣床上加工拖拉机差速器壳俸内球面的一种辅具。镗杆4的上引导能在夹头1中滑动,夹头用螺钉固定于立车或镗铣床的转塔上。粗、精
Figure is in the vertical lathe or boring and milling machine processing tractor differential shell of a kind of auxiliary spherical shell. The upper guide of the boring bar 4 can slide in the collet 1, and the collet is screwed on the turret of the vertical lathe or boring-milling machine. Crude, refined