DRILLING - Practice Mode

1) What is the purpose of flute in drill?

To drive out the chips To reduce the weight To reduce the cost To increase the speed

Correct Answer: To drive out the chips

2) What is the angle of countersink tool used on holes to be threaded?

75 Degree 80 Degree 90 Degree 120 Degree

Correct Answer: 120 Degree

3) What is the formula to calculate the blank size of external thread (where p=pitch and d=depth)?

D = d ? p/10 D = d + p/10 D = d x p/10 D = d ? p/10

Correct Answer: D = d ? p/10

4) Which type of thread, the crest and roots are rounded to form a semi circle?

Acme thread Square thread Knuckle thread Trapezoidal thread

Correct Answer: Knuckle thread

5) What 5 denotes in grinding wheel specification 41A46H5U8?

Bond Abrasive Structure Grain size

Correct Answer: Structure

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