roject based on the study of mechanical operators : pulleys and eccentric. It is the brainchild of Carlos Guerrero MartÃnez . class
We're going to try to design and build a similar project, this work is going to do with the courses of 2 and 3 Right.
eccentric pulleys and we are going to make with cardboard and each student has to make three different size pulleys. All pulleys made use those are well made, discarding those that are not . How to Make a pulley?
We're going to try to design and build a similar project, this work is going to do with the courses of 2 and 3 Right.
eccentric pulleys and we are going to make with cardboard and each student has to make three different size pulleys. All pulleys made use those are well made, discarding those that are not . How to Make a pulley?
General Theory
A pulley is a simple machine used to transmit a force. This is a wheel, usually solid ribbed edge, which, in the course of a rope or cable that passes through the channel ("throat"), is used as the transmission element to change the direction of motion in machines and mechanisms. In addition, joint-forming equipment or hoists, serves to reduce the magnitude the force required to move a weight. Equipment needed
- Carton (which is compact).
- brass bushings.
- M4 Stud.
- M4 nuts and washers.
- White glue for wood.
- Rubber Bands of different lengths (10, 12 and 14 cm).
- round wooden rod (6mm).
- Tablex 3mm (you can use any material, including cardboard). Tools
- hacksaw.
- Drill. Lima
- round.
- Scissors.
- Cutter.
1 .- produce an eccentric and he put a crank near the outside edge.
2 .- manufacture two identical brackets cardboard 
3 .- Once we have the two media, we make a hole using a 5mm drill, this hole is necessary to introduce cap brass and then paste the brackets as shown in the following image. 
5 .- began to mount the system on the basis of tablex . 
The first part of the project is an eccentric with a handle, a shaft and a pulley, then we will mount the first transmission system of pulleys and belt. General Theory
A transmission system is a mechanism used to communicate motion from one shaft to another. This can be achieved in several ways:
.- By gears : These mechanisms are formed by wheels or bars that have teeth and are connected to each other, so that, when turning or moving one, the other rotates or moves in another direction.
There are four basic types of gears: straight wheel, bevel, rack and pinion and worm. Each is used to get a different effect.
.- By sprockets and chain: These mechanisms are composed of two gears that are connected by a chain that engages the teeth of the wheels.
serve to connect two shafts that are remote.
.- Using pulleys and belt: These mechanisms consist of two or more pulleys, connected by two to two flexible straps. are used, as well as sprockets and chain, to connect two shafts that are remote.
Changing the position of the pulley can change the direction of rotation.
6 .- The first drive system is made up: on two supports made of cardboard, which in its upper part we have made a hole with a 5mm drill after introducing a cap on those holes Brass (its mission is to reduce friction and wear of cardboard), threaded rod 10 cm long and two pulleys of different diameters. 
Once assembled and tested system that works properly, that is, it does not get any gum the two pulleys, we've built the system a decorative element. 
We will be incorporating the new system, axles and pulleys to complete our machine .... 
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