Compound machines are machines that contain more than one basic machine. There's the axe, for example. It functions as both a wedge and a lever. Compounds can be used to increase the force of action of a machine tool.
A compound machine is nothing more than the union of two or more basic machines. The lever, wedge, wheel and axle, and inclination plane are examples of rudimentary machines. The pulley and screw are sometimes referred to as basic machinery. Despite the fact that practically every tool we use in our everyday lives is a compound machine. The common lathe is the most important single machine in the world of manufacturing.
The parts of a compound machine are usually classified as driving and driven. The driving parts are those that transmit power from its source to the driven parts. The driving parts may be either motor-powered or hand powered. The driven parts are those that do the actual working on their respective materials. They can be as simple as a hand-cranked drill or as complex as a jet engine. The parts of a compound machine can also be divided into direct drive and indirect drive groups. Direct drive means that one part drives another part without any help from other parts. Indirect drive means that at least one other part needs to engage for one part to move. For example, a hand-operated crank turns an axel which in turn moves a piece of wood along with it.
Hand-powered tools include such items as drills, saws, and hammers. Motorized tools include appliances such as vacuum cleaners, lawn mowers, and hedge trimmers.
A compound machine is one that is made up of more than one basic machine. Compound machines, like wheelbarrows or corkscrews, are made up of only two basic machines. Large compound machines, such as automobiles, are made up of hundreds or thousands of basic machines.
Compound machines are easy to understand if you think about it. A wheelbarrow is just a box with wheels on it. So is a cart. They both have handles so they can be pushed by human power. And all carts are not created equal: some have two wheels while others have four. But a wheelbarrow has the advantage of being able to carry a much heavier load over longer distances than a cart because it uses its legs to balance itself while pushing instead of having a driver like an automobile does. Thus, it can be said that wheelbarrowing is an example of a compound machine.
Some might argue that an automobile is a compound machine because it includes components from other machines such as engines and transmissions. However, an automobile's main function is to transport people and/or materials, which indicates that it is a tool rather than a machine in itself. It would be more appropriate to say that an automobile is a product of many different types of machines working together as a team to create something new.
It is a lever because it can be swung around, and the wedge is used to cut the wood. A compound machine necessitates the use of more than one. The compound machines cannot function without one another. The swing is only capable of cutting wood.
Swing design varies depending on the type of wood being cut. For example, flat-top swings are used for cutting down trees into lumber, while round-top swings are needed for shaping timber before it is cut into boards or beams. The type of wood that will be cut determines which type of swing is most suitable.
All swings are driven by some form of engine power source, such as an electric motor, a gasoline/electric hybrid motor, or a steam engine. This drives a blade (or knives) in the head of the swing that cuts the wood as it passes over it. The amount of force applied to the blade can vary depending on the type of swing; however, all swings require some form of external force to operate them.
A swing can be as simple as a stick with a knife tied to the end of it or it can be very sophisticated machinery that includes motors, batteries, and computers. No matter what type of swing you have, you must feed it with enough tree trunks or poles so that many slices can be made from one load of wood.
Simple machines are used to make work easier. They are used in various places and times in our lives. They include the pulley, screw, wheel and axle, wedge, lever, and the inclined plane. Compound machines are made up of two or more simple machines. For example, a motor is a compound machine because it has both a magnet and a conductor (copper wires) that turn when electricity flows through them.
Screws are often called "hand tools" because they can be used by hand instead of being powered by an engine or electric motor. However, this term should not be taken lightly because many people think that screws are simple machines. Actually, screws are complex machines because they have several parts that work together to get the job done.
Screws are devices that rotate one piece of material relative to another. They are used to fasten materials together, such as wood to metal, or plastic. The first screws were actually rocks with holes drilled into them. These were probably used by early humans to fix their clothes or shelters. As time passed, these rocks with holes became smaller and smaller until they developed into the modern-day screw.
Modern screws can be divided up into three main categories: threaded, headed, and punched. Threaded screws have a continuous thread down their length which helps them hold larger pieces of material together.
Lever Classes, Simple and Compound Machines
| A | B |
|---|---|
| A hand drill (egg beater style) uses the following simple machines: | Wheel and Axle, Lever. Gear and Screw. |
| The manual Can Opener we demonstrated in class uses these simple machines: | Lever, Wheel and Axle, Gear and Wedge. |
Machines with Compound Functions A pair of scissors is a complicated simple machine that cuts something by forcing wedges (scissor blades) onto it with levers. Several complex machines are made up of many basic devices. The most basic complex machines are the wheel and axle, arm, and hand. More advanced ones include engine, radio, and television. Finally, more sophisticated machines include computer and airplane. All of these are composed of simpler parts that work together to form a complete machine.
Scissors have several features in common with other cutting instruments such as knives and axes. They have a sharp edge that slices through material. Also, like those tools, they can be used to chop or mince food. Finally, scissors need to be closed in order to be used; when closed, their edges face one another so that they can cut.
However, unlike other cutting tools, they also require some type of trigger mechanism to open and close them. This is because if left open, the sharpness of the blade would be able to cut whatever its held against. Since scissors are usually used on materials that could get caught on the blade's edge, they need mechanisms to unlock and lift the blade before use and lock it back down after cutting.
In addition to unlocking the blade, most scissors have another mechanism called a pivot point.
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