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levers, mechanisms and motion dont copy lol

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Prem Sodhi

on 21 February 2013

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Transcript of levers, mechanisms and motion dont copy lol

Levers, Mechanisms and Motion
By Prem Sodhi
Motion All tools and machines are made up of mechanisms, a complicated machine is lots of mechanisms working together. A mechanism is a device which takes an input motion and force, and outputs a different motion and force. The mechanisms most commonly used in mechanical systems are levers, linkages, cams, gears, and pulleys. Types of motion include: Rociprocating - straight line, forwards and backwards Rotary - circular movement When an object moves it is said to be in motion. The type of motion is described by the direction in which the object moves. Oscillating - circular forwards and backwards movement. Linear - means the object moves in a straight line. Levers A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. Many of our basic tools use levers, including scissors , pliers, hammer claws, nut crackers, and tongs. All levers are one of three types, usually called classes. The class of a lever depends on the relative position of the load, effort and fulcrum:
*The load is the object you are trying to move.
*The effort is the force applied to move the load.
*The fulcrum (or pivot) is the point where the load is pivoted. Class 1 lever Class 2 lever Class 3 Lever Mechanisms Examples of changes in motion: Rotary linear Gears Gears consist of toothed wheels fixed to shafts. The teeth interlock with each other, and as the first shaft (the driver shaft) rotates, the motion is transmitted to the second or driven shaft. The motion output at the driven shaft will be different from the motion input at the driver shaft - in place, speed, direction and other ways. A number of gears connected together are called a gear train. The photograph below shows a simple gear train made up of a couple of spur gears. These are the common gears (or cogs) that look like wheels with teeth around the rim. Spur Gear Worm Gear Another method of making large speed reductions is to use a worm gear. This is a shaft with a thread like a screw. This connects at 90° to a large gear (the thread shaft points along the outside edge of the larger gear). Each time the shaft spins one revolution, the gear turns forward by only one tooth. Bevel Gear Bevel gears, like worm gears, change the axis of rotation through 90°. The teeth have been specially cut so the gears will mesh at right-angles to each other. Pulleys Pulleys are used to change the speed, direction of rotation, or turning force or torque.
A pulley system consists of two pulley wheels each on a shaft, connected by a belt. This transmits rotary motion and force from the input, or driver shaft, to the output, or driven shaft. Thank You For Watching
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