It is necessary for both straight profile toroid worm and double enveloping toroid worm to be pruned on the faces of teeth.
直齿廓环面蜗杆或者二次包络环面杆蜗，均需进行修形加工。
2
This paper presents a calculating method for the edge of a new hob with straight groove and zero rake Angle. The original section edge of the said hob is on the surface of basic worm.
本文提出了对直槽零前角滚刀，原始截面刃形在基本蜗杆齿面上，其新滚刀刃形的计算方法。
3
In this paper, the axial section profile of worm with straight generatrix is analyzed and calculated according to Angle projection calculating.