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Glossary Index

A B C D E F G H I J K L M P Q R S T U V W

Drilling Applications

Drilling Applications

Speed:

This refers to the speed at which the drill rotates. Charts can be provided on request but as a general rule masonry drills should be used at a much slower speed than metal or wood cutting drills to reduce overheating. The larger the hole the slower the speed. Metal cutting drills are used at a higher speed (rpm), but again with the principle the larger the drill the slower the speed. Hard metals usually require drilling at a slower speed, soft metals at a higher speed.

Feed:

Refers to the pressure at which the drill is pushed into the hole and is expressed in thousandths of an inch or millimetre per revolution. It is important to maintain steady pressure to reduce the strain on the drill, clogging and overheating. Soft materials can accept higher rate of feed than hard materials.

Lubricant:

Metal cutting drills should be used with a lubricant. The choice of the correct cutting oil will make a substantial difference to performance. The required lubricant varies from light oil for aluminium to soluble oil for malleable iron.