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Screw guns also exist with autofeed mechanisms, with which each time one finishes driving a screw, another screw gets automatically loaded onto the tip. The most common autofeed mechanism uses collated screws, which means a strip of screws held together by plastic. A screw gun that uses collated screws is known as a collated screw gun.
As with their air-actuated cousins, powder-actuated guns have a muzzle safety interlock. If the muzzle is not pressed against a surface with sufficient force, the firing pin is blocked and cannot reach the load to fire it. This helps ensure that the gun does not discharge in an unsafe manner, causing the nail to become an unrestrained projectile.
Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver.This form was the first type of screw drive to be developed, and, for centuries, it was the simplest and cheapest to make because it can just be sawed or filed.
A power tool is a tool that is actuated by an additional power source and mechanism other than the solely manual labor used with hand tools.The most common types of power tools use electric motors.
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Radial Arm Saw. A radial arm saw is a cutting machine consisting of a circular saw mounted on a sliding horizontal arm. Invented by Raymond DeWalt in 1922, the radial arm saw was the primary tool used for cutting long pieces of stock to length until the introduction of the power miter saw in the 1970s.
Porter-Cable nail gun in use. In 1981, Pentair, Inc. acquired Rockwell's power tool group — consisting of Porter-Cable and Delta Machinery — and restored the Porter-Cable name. The company ended production of consumer level tools, and repositioned itself as a manufacturer of professional power tools.
In 1940, Paslode created the first Stapling Hammer. In 1959, the world's first Pneumatic nailer. By 1986, they had created the Impulse range of gas actuated nailing systems, commonly referred to as a nail gun. In 1986, ITW (Illinois Tool Works) acquired Paslode. The PASLODE brand joined the SPIT company in France in 2002.