Design of pliers

Class 1 levers A class 1 lever has the load and the effort on opposite sides of the fulcrum, like a seesaw.

Load and effort are forces and are measured in Newtons N. The fulcrum or pivot is the point where the load is pivoted. The point of a mechanism is to make the job easier to do. The ratio of the output force to the input force in a mechanism - in other words, the factor by which the mechanism multiplies the force put into it.

This means that they allow you to move a large output load with a small effort. Next A mechanism is simply a device which takes an input motion and force, and outputs a different motion and force. Mechanical advantage is calculated as follows: A form of velocity ratio, the gear ratio determines the number of revolutions made by each gear.

The catch is that to make the effort smaller, you have to move a greater distance. Also sometimes called the distance ratio. But using a lever - a rod with the fulcrum placed closer to the load than the point of effort - it only requires a force of N. This trade-off is calculated by the velocity ratio: Press play to see a demonstration.

In the first diagram the trade-off is that you need to push the lever down further to move the load up a smaller distance. The ratio of the number of teeth on a driving gear to the number of teeth on the driven gear. The ratio of the distance travelled by the effort to the distance travelled by the load. A lever is the simplest kind of mechanism. Examples of a class-one lever are a pair of pliers and a crowbar. For example, it would take a force of N to lift the load in the animation below.

There are three different types of lever. The effort is the force applied to move the load. Common examples of each type are the crowbar, the wheelbarrow and the pair of tweezers. Class 2 levers A class 2 lever has the load and the effort on the same side of the fulcrum, with the load nearer the fulcrum.

In the diagram, the wheel or fulcrum on the wheelbarrow is helping to share the weight of the load. The class of a lever depends on the relative position of the load, effort and fulcrum: This means that it takes less effort to move a load in a wheelbarrow than to carry it. All levers are one of three types, usually called classes. Mechanical advantage and velocity ratio Class 1 and class 2 levers both provide mechanical advantage.

Examples of a class-two lever are a pair of nutcrackers or a wheelbarrow. The mechanisms most commonly used in mechanical systems are levers, linkages, cams, gears, and and pulleys. The load is the object you are trying to move.Levers: 1. You need to know how to calculate the mechanical advantage [mechanical advantage: The ratio of the output force to the input force in a mechanism - in other words, the factor by which. Devardi Glass Lampworking Tools & Supplies. Easily cut large diameter glass tubes (over 30mm)-Cutter scores the inside of tube.

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