FY->Module-6 : THREAD CUTTING - Practice Mode

1) Why the thread chaser is used to form threads?

For easy thread cutting To get proper, crest, flat, root radius and profile To time saving To reduce labour

Correct Answer: To get proper, crest, flat, root radius and profile

2) Calculate the change gears to cut a worm of 0.35" lead on a lathe with a lead screw of 4TPI?

Driver 30T, Driven 40 Driver 40T, Driven 50 Driver 50T, Driven 30 Driver 70T, Driven 50

Correct Answer: Driver 70T, Driven 50

3) What is the criteria for the selection of interchangeable anvil of a screw thread micrometer?

Major diameter Minor diameter Profile and pitch Root diameter

Correct Answer: Profile and pitch

4) What is the effect of reversing the machine with out disengaging the half nut in thread cutting?

For avoid catching the thread in each cut For improve the productivity Reduce the wear and tear of half nut For the use of chasing dial

Correct Answer: For avoid catching the thread in each cut

5) How much the compound rest should be tilted for cutting metric thread by compound rest?

15 Degree 30 Degree 45 Degree 60 Degree

Correct Answer: 30 Degree

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