worm-thread tool gauge 齿轮滚刀用样板

multiple thread worm 多头螺纹蜗杆 ; 多头蜗杆

single thread worm 单头螺纹蜗杆

worm thread tool gage 齿轮滚刀用样板

worm thread grinding machine 蜗杆螺纹磨床

Worm & Thread Milling Machine 蜗杆螺纹铣床

thread worm 线虫类

master worm with one thread 单头测量蜗杆