DRILLING - Quiz

1) Which term indicates the amount of bond present between the individual abrasive grains?

Grain Grade Abrasive Structure

2) Which angle determines the rake angle of drills?

Helix angle Core angle Point angle Chisel edge angle

3) What is the drill size for Dia 15 mm reaming hole?

14.75 mm 14.50 mm 15.25 mm 14.65 mm

4) Why drilled holes are over sized in drilling operation?

Drill is not sharp Unequal lip length Feed rate is too high Cooling is insufficient

5) What is the name of the operation producing flat seat on drilled hole?

Drilling Spot facing Countersinking Counterboring