Basic Tool Information and Safety

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Basic Tool Information and Safety Basic Tool Information And Safety G.A. Blackburn © TINKERS CORNER 2010 The amount of energy delivered to the target by the hammer-blow is equivalent to one half the mass of the head times the square of the head's speed at the time of impact While the energy delivered to the target increases linearly with mass, it increases geometrically with the speed (see the effect of the handle, below). HAMMER Force A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving nails, fitting parts, forging metal and breaking up objects. Hammers are often designed for a specific purpose, and vary widely in their shape and structure. The usual features are a handle and a head, with most of the weight in the head. The basic design is hand-operated, but there are also many mechanically operated models for heavier uses, such as steam hammers. The hammer may be the oldest tool for which definite evidence exists. Stone hammers are known which are dated to 2,600,000 BCE.[1][2] The hammer is a basic tool of many professions. Popular hand-powered types include: Ball-peen hammer, or mechanic's hammer Carpenter's hammers (used for nailing), such as the Framing hammer and the claw hammer The physics of hammering Construction hammers, including the Sledgehammer Hammer as a force amplifier Cross-peen hammer, or Warrington hammer A hammer is basically a force amplifier that works by Drilling hammer - a lightweight, short handled converting mechanical work into kinetic energy and back. sledgehammer In the swing that precedes each blow, a certain amount of Gavel, used by judges and presiding authorities in general kinetic energy gets stored in the hammer's head, equal to Geologist's hammer or rock pick Knife-edged hammer the length D of the swing times the force f produced by the Lump hammer, or club hammer muscles of the arm and by gravity. When the hammer Mallets, including the rubber hammer and strikes, the head gets stopped by an opposite force coming Dead blow hammer Soft-faced hammer from the target; which is equal and opposite to the force Splitting maul applied by the head to the target. If the target is a hard and Stonemason's hammer heavy object, or if it is resting on some sort of anvil, the Tinner's Hammer head can travel only a very short distance d before stopping. Upholstery hammer Since the stopping force F times that distance must be equal to the head's kinetic energy, it follows that F will be much greater than the original driving force f — roughly, by a factor D/d. In this way, great strength is not needed to produce a force strong enough to bend steel, or crack the hardest stone. Effect of the head's mass The amount of energy delivered to the target by the hammer-blow is equivalent to one half the mass of the head times the square of the head's speed at the time of impact While the energy delivered to the target increases linearly with mass, it increases geometrically with the speed (see the effect of the handle, below). TINKERS CORNER SAFETY WITH A HAMMER Make sure the handle of the hammer fits tightly on the head. Do not strike a hard steel surface with a steel hammer. This may cause small pieces of steel to fly and injure someone. Always strike the surface squarely - avoid glancing blows. Never strike any hammer with or against another hammer Always wear safety goggles. Discard a hammer with a chipped or Discard hammers with mushroomed cracked claws or eye face. Replace loose or cracked sections. handles ALL ABOUT HAMMERS http://www.hammernet.com/safety.htm http://en.wikipedia.org/wiki/Hammer HTI (Hand Tools Institute) Vaughan Manufacturing National Safety Council ISO (International Standards 3 Organization) SAW Cutting A saw is a tool that uses a hard blade or wire with an abrasive edge to cut through softer materials. The cutting edge of a saw is either a serrated blade or an abrasive. A saw may be worked by hand, or powered by steam, water, electricity or other power. Hand saws Hand saw uses the blades thickness to remain stiff. The pull stroke also reduces the amount of stiffness required. Some examples are: Crosscut saw for making cuts perpendicular to the grain Rip saw for cutting along the grain Two-man saw for cutting large logs or trees Plywood saw fine-toothed blade to reduce tearing of plywood Diagram showing the teeth of a Veneer saw two edged saw with fine teeth used to cut saw blade when looking front-on. veneer The teeth protrude to the left and Hacksaw fine-toothed tempered blade under tension for right, so that the saw cut (kerf) is cutting metal, bone, and other hard materials. wider than the blade width. The term set describes how much the teeth protrude. Mechanically powered saws Mechanically powered saws are different from hand saws in that the blade moves while the wood remains stationary. Circular blade saws Circular saw, used in industrial sawing of log and beams, typically found in sawmills – also name given to smaller hand-held saws Table saw, circular blade rising through a slot in a table. A smaller direct-drive versions can be set on a workbench is called workbench saws. If set on steel legs it is called a Contractor's Saws. A heavier version, which is more precise and more powerful and driven by multiple belts with an enclosed base stand is called a Cabinet saws. A new version, called a hybrid saw, has the lighter weight mechanism of a Contractor saw but with an enclosed base like the Cabinet saw. Radial arm saw is a versatile machine used mainly for cross-cutting. The blade is pulled on a guide arm through a piece of wood held stationary on the saw's table Rotary saw is used to make accurate cuts without the need for a pilot hole in wallboard, plywood, and other thin materials. It can be called a spiral cut saw or a "RotoZip". Electric miter saw, (also called chop saw, cut-off saw or power miter box) is used for making accurate cross cuts and miter cuts. The basic model has its circular blade fixed at a 90° angle to the vertical, a compound miter saw's blade can be adjusted to other angles. A sliding compound miter saw has a blade which can be pulled through the work similar to the action of a radial arm saw, which gives a greater capacity for cutting wider workpieces. Concrete saw, usually powered by an internal combustion engine and used with a Diamond Blade to cut concrete or asphalt pavement. Abrasive saw, which uses an abrasive disc for cutting rather than a toothed blade. Abrasive saws are used for cutting very hard materials, such as metal. Reciprocating blade saws Effect of the head's mass Jigsaw or saber saw (US) has a narrow blade for cutting irregular shapes. The term jigsaw was also commonly used for what is now called a scroll saw. Reciprocating saw or sabre saw (UK and Australia) use an action similar to a jigsaw. They are larger, more powerful and use a longer stroke with the blade parallel to the barrel. It is useful for demolition work or for cutting pipe, and is sometimes powered by compressed air. Scroll saw is a saw for making intricate curved cuts (scrolls). Dragsaw is used for bucking logs before the advent of the chainsaw. Sternal saw is used in surgery to open a patient's sternum. Continuous band Band saw, with motor-driven continuous band Chainsaw, motor-driven, for felling trees TINKERS CORNER The amount of energy delivered to the target by the hammer-blow is equivalent to one half the mass of the head times the square of the head's speed at the time of impact While the energy delivered to the target increases linearly with mass, it increases geometrically with the speed (see the effect of the handle, below). SAFETY WITH A SAW Never use a dull saw 1 – Wear a Safety Mask and Goggles When you use a hand saw, there is always a risk of splinters flying. Sometimes the object being sawed may rebound and hit the person operating the hand saw. To protect your face and eyes, you must always wear a safety mask and eye protection. 2 – Use a Tool of the Right Size Hand saws are available in different sizes and capacities. Before you start using the hand saw, you must properly assess the stock in question. Avoid using hand saws that are too big or too small for the project. 3 – Inspect Hand Saw before Every Use Before you use a hand saw, inspect it thoroughly for any signs of damage. If the handle is loose, or the blade is bent or broken, or if there are missing blade teeth, you must not use the hand saw. Also ensure that no one else uses the tool by marking it as unsafe. 4 – Check Material for Knots or Nails Knots, metal pieces, nails and screws in the stock may damage the blade. It can also cause buckling of the hand saw, which can lead to injury. Avoid such situations by properly inspecting the stock beforehand. 5 – Never Test Sharpness with Hands You must never test the sharpness of a hand saw with your hand or any other part of your body. Doing so may result in cuts and injury.
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