The majority of sophisticated machines are composed of a sequence of smaller machines. When this occurs, the force supplied to one simple machine in a series is frequently transmitted to the next simple machine in the series. A compound machine is a pencil sharpener that employs a crank because it combines two basic devices. The wheel and axle, or hub, at the center of a crank mechanism is called a crankshaft when used as a drive shaft for machinery. Other parts of a crank mechanism, such as those on a hand-crank, also serve functions in other types of machinery.
All tools need maintenance to keep them working properly. Simple tools can be maintained by anyone with a little know-how. More complicated tools may require a professional to perform repairs correctly and often. It's important to understand how a tool works before you try to repair it. For example, if you attempt to fix a motor by disassembling it then reassembling it, without first learning how motors work, you likely will make things worse than they were before you started!
Repairing a tool involves fixing or replacing parts of it that need replacement. For example, if your knife blade starts to break off after use, you will need to replace the knife handle or the knife blade itself. When repairing tools, it's important to use materials or techniques that will not harm the quality of the product you are trying to protect.
Why is a pencil used? The Sharpener is made up of two basic machines: A compound machine is one that is made up of two simple machines: a wheel and axle and a wedge. The wheel has several notches cut into it, each of which corresponds with a hole in the axle. When the wheel rotates, it passes over the holes in the axle, causing it to turn also. The wedge is used to force the notch on the wheel toward the opposite side, thereby causing the wheel to rotate even more quickly.
What does this have to do with writing instruments? Writing instruments are manufactured from various materials designed to make a point when pressed down onto a surface. Some writers prefer using only one type of pen, while others will use three different kinds of pen.
There are two main types of pens: Ballpoint and fountain. Ballpoint pens use a small steel ball called a filler which fits inside the barrel of the pen. As the writer moves the pen across the paper, the filler lifts tiny drops of ink which then attach themselves to the paper. Fountain pens use a reservoir of ink embedded in the handle of the pen. As the writer presses the pen against the paper, the ink flows out of the top and onto the page.
Compound machines are another name for complex machinery. A complicated machine is formed by the collaboration of two or more basic machines. Compound machines are capable of doing more challenging tasks than basic machines alone. Bicycles, wheelbarrows, cranes, vehicle jacks, lawn movers, and other complicated equipment are examples. Modern technology has made it possible to combine different types of engines in a single device called an "engine-generator". Such generators can be used as backup power sources in emergency situations.
A machine is considered simple if its parts can be readily identified and distinguished one from another. The parts of a compound machine may be very intricate, but they should still be distinguishable. For example, a gas turbine engine consists of a compressor, a combustor, a turbine, and a shaft that connects the compressor and the turbine. Each part of this machine performs a specific function - the compressor raises the pressure of the air entering the engine, for example - but they cannot be separated easily.
Complex machines are usually constructed from simpler components put together. For example, a bicycle uses several simple components combined in a way that produces a vehicle that can be ridden on land. Lawn mowers, wagons, and cars are all forms of complex machinery that are made up of various combinations of wheels, axles, steering wheels, brake systems, etc.
Simple machines are classified into six types: a lever, a wedge, an inclined plane, a screw, a pulley, and a wheel and axle. This is known as the "mechanical advantage" of the machine. Pencil sharpeners employ either a wedge alone or a wedge combined with a wheel and axle. This type of simple machine is called a "wedge-wheel" device.
A wedge is any piece of wood, metal, or other material that increases in thickness from one edge to another. The thickest part of the wedge is called the body. The thin end is called the face. A wedge can be used as a tool to leverage objects by placing it under the object you want to lift or push. As the wedge is applied pressure down on one end, its face will force up against whatever is underneath it. If you release your pressure on the top end, the bottom end will drop back down again to lift or push the object over one more layer of earth.
In the case of a pencil sharpener, the body of the wedge is usually shaped like a hollow tube with a flat face attached to one end. The other end is flat or rounded. There should be at least one hole in the center of the face of the wedge for the sharpened pencil to pass through. The face of the wedge contacts the top of the pencil casing when inserted into the sharpener tube.