THREAD CUTTING - Quiz

1) What is the depth of ACME thread of 1inch major diameter 6TPI?

0.08 0.082 0.084 0.09

2) What is the formula to find out core diameter of external thread by using prisms and micrometer?

Core dia = Measurement over prisms ? Height of prisms ? Single depth of thread Core dia = Measurement over prisms ? Height of prisms + Two depth Core dia = Measurement over prisms + Height of prisms ? Single depth Core dia = Measurement over prisms ? Height of prisms + Single depth

3) Find the gears for simple gear train, if pitch of lead screw is 6 mm and pitch of thread to be cut is 2 mm?

30/120 50/120 40/120 40/150

4) How much times the spindle rotate the lead screw to cut 3 mm pitch thread in a 12 mm pitch lead screw?

4 times 5 times 6 times 3 times

5) What is the purpose of using taper parallels in thread measurement?

To measure the minor diameter of external thread To measure the minor diameter of internal thread To measure the major diameter of external thread To measure the major diameter of internal thread