SY->Module-5 : THREAD CUTTING - Practice Mode

1) What is the purpose of change gear train in centre lathe?

Connecting spindle gear to fixed stud gear Connecting fixed stud gear to quick change gear box Connecting quick change gear box to lead screw Connecting lead screw to changing dial

Correct Answer: Connecting fixed stud gear to quick change gear box

2) What is the purpose of idler gear in simple gear train?

Reduce gear ratio Transmit power between driver and driven gears Reduce spindle speed Increase spindle speed

Correct Answer: Transmit power between driver and driven gears

3) Which parameter will decide the driver and driven gear ratio to cut thread on lathe?

Major dia of work Pitch Root dia of work Angle of thread

Correct Answer: Pitch

4) Calculate the change gear to cut 6 mm pitch on a work having a lead screw of 5 mm pitch. Gears available from 20 to 120 teeth by 5 teeth range.

Driver 60 driven 50 Driver 40 driven 20 Driver 85 teeth driven 60 teeth Driver 100 teeth driven 25 teeth

Correct Answer: Driver 60 driven 50

5) Calculate the change gear to cut 8 mm pitch on a work having a lead screw of 4 mm pitch gear 20 to 120 teeth by 5 teeth range

Driver 40 teeth Driven 20 teeth Driver 50 teeth Driven 60 teeth Driver 80 teeth Driven 25 teeth Driver 60 teeth Driven 35 teeth

Correct Answer: Driver 40 teeth Driven 20 teeth

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