Create a workable compound machine that combines at least three separate basic machines to explode a balloon. Create a sophisticated machine to do a task for your house that incorporates at least three basic machines. For example, a microwave oven uses two simple machines: a motor and a lever. A washing machine uses another two simple machines: a motor and a pump.
A compound machine is one that uses more than one simple machine to perform a task. For example, a ball-peen hammer is a simple machine used by carpenters to smooth wood surfaces before finishing them. A power drill is a more complicated machine that uses a small electric motor together with a tool called a bit to make holes in materials such as wood, metal, and plastic.
Simple machines can be combined into more complex machines. For example, the power drill can be added to a hand-operated screwdriver called a spindle driver to create a drilling machine. Other common compound machines include: bulldozers, cranes, forklifts, harvesters, plows, rotary mowers, tractors, and wheeled loaders.
Simple machines have several important features in common. They all consist of a moving part called a shaft which passes through the center of the machine. The shaft may be powered by a motor or by human effort.
Three straightforward machines: the pedal, the crankset, and the wheel. Many more complicated machines are used in modern bicycles that change how we travel over land or water, but these three make up the backbone of the industry.
A pedal is a simple machine that converts human power into mechanical power. There are two types of pedals: flat and raised. A flat pedal attaches to the shoe and has a flat surface where the foot rests. A raised pedal attaches to the bottom of the shoe and has a raised surface where the foot rest. Both types of pedals use a rod called a crank to connect to a chainring and chain for propulsion. Raised pedals are usually found on racing bikes while flat pedals are usually found on recreational bikes.
The crankset is the joint between the pedal and the bike frame. It allows the leg to rotate around the center point of the bike while maintaining contact with the ground through the pedal. Modern cranksets often have several different sizes of arms/pedals that fit together to accommodate various leg lengths. They also tend to be flexible so they don't cause injury if you fall off your bike.
Students' comprehension of simple machines is expanded with an introduction to compound machines. A compound machine, which is a mixture of two or more basic machines, can have a greater impact on work than its separate components. Engineers that create compound machines hope to assist society by making people's lives simpler by making simple domestic jobs easier. For example, engineers have developed lawn mowers that are both human-powered and electric.
Simple machines include the hand ax, which is used to break wood; the sledgehammer, which is used to break rocks; and the drill, which is used to bore holes in materials like wood and metal. Engineers use these tools alone or in combination to build many useful items including wells, bridges, and cars.
Learning about simple machines helps students understand how objects smaller than themselves can have such a large impact on projects they work on. They also learn that engineers use what they call "efficiency factors" to make their equipment work better. For example, an engineer might design a lawnmower that is both human-powered and electric because they believe that combining these two types of power is more efficient than using one type alone. This knowledge will help students when they think about ways things could be improved at home and at school.
Simple machines are important to know about because they play a role in many areas of engineering.
Machine for compounding materials, such as a cement mixer, has a rotating drum with blades or hooks that mix the ingredients. The term "crane" describes a class of machines that use jacks or other devices to lift heavy weights or materials that are far below the lifting point.
The first cranes were used in the 16th century and they are still in widespread use today. They come in several types, depending on how the load is lifted. For example, a gantry crane uses a horizontal beam called a gantry to lift objects by hanging them from the end of the gantry. A dragline crane uses a cable and bucket system to lift very heavy objects by pulling them through the ground.
Other types of cranes include tower cranes, overhead cranes, scissor lifts, and cherry pickers. Tower cranes are used to lift objects that cannot be reached easily otherwise. Overhead cranes are similar to tower cranes but they have a vertical lift axis instead of a horizontal one. Scissor lifts are used by people who have difficulty lifting heavy objects over their heads. Cherry pickers are small cranes used to reach high places where others can't go.
MACHINES FOR COMPOUNDING A compound machine is the result of the combining of two or more basic machines. The most common types are those called "compound presses" which are used to create hollow products such as cans from metal sheets. They consist of an upper and a lower die that compress the material between them.
Other examples include cranks, which are mechanical equivalents to a lever-arm; they transmit motion through a central shaft, like a crank arm does for a human being (or an electric motor); motors, which are devices that convert electrical energy into mechanical energy; pumps, which force fluid through pipes; and generators, which produce electricity from mechanical movement (e.g., through rotation).
Machines also include structures that connect one part of the machine to another. For example, a bearing is a structure that connects the rotating part of a machine to its stationary part. It provides support for the rotating part while allowing it to move freely in relation to the fixed part.
Finally, machines can be classified according to whether they increase or decrease the speed of their input source.