any desired location. An upper casting fits on the lower one and can be moved transversely upon it, on some type of keyed ways(键槽), to permit aligning(校准,对正) the tailstock and headstock spindles. ……РLesson 23 Lathes车床Р……The third ponent of the assembly is the tailstock quill(尾架套筒). This is a hollow steel cylinder(钢制空心圆柱体), usually about 51 to 76 mm (2 to 3 inches) in diameter, that can be moved several inches longitudinally in and out of upper casting by means of a handwheel and screw(手轮和螺杆).РLesson 23 Lathes车床РThe size of laths is designated(指定)by two dimensions. The first is known as the swing(摆动). This is the maximum diameter of work that can be rotated on a lathe. It is approximately twice the distance between the line connecting the lathe centers and the nearest point on the ways. ……
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