The conception that the form-milling cutter can only be used to rough finish the workpiece should be changed. This kind of form-milling cutter can also be used to finishing-machine workpiece.
改变正前角成形铣刀只能用作粗加工的观念，可将正前角成形铣刀用于成形面的精加工。
2
At the start of the 13th century, a primitive form of milling the silk threads was already in use.
十三世纪开始，人们已经在运用使丝线缩绒的原始形式了。
3
By mathematical calculation and using a copying fixture, the orbit of movement of an end-millingform cutter is obtained.