Drills and Drilling Machines

How a Drill Cuts

Drilling is the operation most often performed on a drill press. Both rotating force and a downward pushing force are needed for drilling.

Parts of a Twist Drill

Clamping Work for Drilling

Correct clamping technique. Note that clamp is parallel to work. Clamp slippage can be reduced by placing a piece of paper between the work and the clamp.

Incorrect clamping technique. T-bolt is too far from work. This allows the clamp to spring under pressure.

Sharpening a Drill

Hold the point lightly against the rotating wheel and use three motions of the shank: to the left, clockwise rotation, and downward.

Centering Round Stock

To align the hole for drilling through exact center, place the work and Vblock on the drill press table or on a surface plate. Rotate the punch mark until it is upright. Place a steel square on the flat surface with the blade against the round stock as shown above. Measure from the square blade to the punch mark, and rotate the stock until the measurement is the same when taken from both sides of the stock.

Counterbored Hole

A sectional view of a hole that has been drilled and counterbored to receive a socket-head screw.

Spotfaced Hole

Counterbores with carbide indexable inserts. The inserts are rotated when a cutting edge becomes dull.

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Author: Aliva Tripathy

Taking out time from a housewife life and contributing to AxiBook is a passion for me. I love doing this and gets mind filled with huge satisfaction with thoughtful feedbacks from you all. Do love caring for others and love sharing knowledge more than this.

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