Holder for a drill bit in a lathe, which allows a hole to be drilled in the work as it is turning.
Drill motor
Electric motor or motor driven by compressed air that has a chuck or other device attached to hold and turn a drill bit.
Drill power
Drill power is measured in maximum horsepower (hp) developed by the motor. Power increases as drill size increases, while drill speed decreases. The more power, the more torque at the cutting end.
Drill press
Machine consisting of a stand, a holder for a drill bit and a motor to turn that bit, which is used to bore holes in precise locations at precise angles.
Drill press vise
Drill press vises are clamps used to hold the workpiece to provide steady operation.
Drill rpm
Drill rpm indicates drilling speed. Generally, the harder the workpiece material the slower (lower rpm) the speed should be. Ferrous metals are best drilled at speeds in the 300-500 rpm range. Most other work can be done more cleanly and faster at higher speeds up to 1200 rpm. Sanding and polishing are usually done at higher speeds. The best way to have many drill-speed advantages is to use a variable speed drill.
Drill saw
Drill bit, used in a drill motor to both drill and then enlarge a hole, by use of cutting teeth along the shank of the bit.
Drill size
Drill size (also called drill capacity) is rated in inches and indicates the maximum bit shank diameter of the chuck, not drilled hole capacity.
Drill speed
Drill speed is how fast a chuck turns. It is measured in rpms (revolutions per minute). Softer materials can be drilled at higher speeds of up to 1300 rpm. For a fast, clean drilling operation, metals and other hard materials require slower speeds. Speed decreases as drill size increases, while drill power increases.
Drill torque
Drill torque is the gear-generated turning or twisting force required to spin a cutting tool at the speed necessary to achieve the task at hand. Higher torque, necessary for driving screws, requires higher drill power.
