Overview

A drill is a tool that produces rotary motion at its tip to perform tasks such as boring holes, driving fasteners, or stirring materials. Drills range from simple manual hand tools to sophisticated electric or pneumatic machines. Many modern models are considered a type of power tool and may be described as an electrical tool when they use mains power.

Types and power sources

Common categories include hand drills (braces and manual chuck drives), corded electric drills that plug into mains supply, and cordless drills that run on a removable or built-in battery. Specialized forms include hammer drills for masonry, impact drivers for high-torque fastening, drill presses for precise shop work, and rotary tools for fine or detailed work.

Basic parts and characteristics

Most drills share a set of basic components: a motor or hand crank that produces rotation; a gearbox or transmission that changes speed and torque; a chuck that holds the bit; a switch or trigger to start and stop motion; and a housing with ergonomic grips. Variable-speed controls, torque clutches, keyless chucks and LED lights are common features on consumer models. Industrial drills may include cooling, heavier housings and integrated dust management.

Bits, attachments and typical uses

Interchangeable bits and attachments determine what a drill can do. Examples include twist bits for wood and metal, masonry bits for concrete, spade and hole-saw bits for larger openings, and driver bits for screws. Beyond boring and fastening, attachments allow sanding, mixing, wire-brushing and polishing. Many household and trades tasks — installing shelving, assembling furniture, mounting fixtures or creating pilot holes for screws — depend on a drill.

  • Driving: inserting and removing screws with driver bits or using impact drivers for high torque.
  • Boring: making round holes in wood, metal, plastic and masonry with the appropriate bit.
  • Special applications: drill presses for repeatable accuracy; mixing paddles for paint or mortar; sanding and polishing attachments for finishing work.

History and development

Mechanical drills evolved from simple hand-powered devices such as bow drills and braces used for thousands of years. The arrival of electric motors in the late 19th and early 20th centuries led to portable electric drills and larger bench-mounted drill presses. Improvements in batteries, motor design and materials in the later 20th century made cordless drills practical and widespread, spawning variations like compact drivers and brushless-motor models.

Safety, maintenance and notable distinctions

Safe use requires choosing the right bit, securing the workpiece, using proper speed and applying steady pressure; eye protection and hearing protection are often recommended. Routine maintenance includes keeping chucks clean, charging and storing batteries correctly, and replacing worn bits. Important distinctions: a drill primarily provides steady rotary motion for drilling, an impact driver supplies rapid, percussive torque suited to fasteners, and a drill press sacrifices portability for greater accuracy and repeatability.