30) Calculate the driven gear to cut 2mm pitch on a job using a lathe having lead screw of 4mm pitch with driven gear 50 teeth?

31) Calculate the driven gear to cut 1.5mm pitch thread on a job using a lathe having lead screw of 4mm pitch with driver gear 30 teeth?

32) Which method of threading is used in mass production?

33) Which is the chip less method of thread production?

34) Which is the commonly used method to produce thread in nut?