The surface obtained when every point on the edge generates an involute is called an involute helicoid.
那表面获得当每一点在那之上边缘产生一纷乱的是呼叫一纷乱的螺旋状的。
2
It's introduced in this paper how to draw the engineering drawing of the plow surface formed by a combination of a oblique helicoid and a hyperboloid of one sheet.