Project: Pulley systems

thingiverse

UPDATECheck out my new project Gyrosphero UPDATENew version Pulley systems V2 with wheel using planetary gear as bearing. To demonstrate how simple multiple chain hoist/pulley block work we need one or more pulleys. A functional single or multiple pulley is the result of this project, showing transmission of forces and weights in physics. Basic 3D geometry has been used during design and construction process. How I Designed This A three-part pulley was created using addition and subtraction of basic geometric shapes. The pulley wheel formed by a cylinder and torus subtracted from it. Pin wheel consists of the addition and subtraction of cylinders, and the pulley housing is formed by a cutaway cylinder with other cylinders and cubes subtracted. To create multiple pulleys, the number of wheels can be set parametrically. All parts are designed for 3D printing. Project: Pulley systems Objectives Students will test and use in practice how pulley block, one of first invented machines, works. Students will find out how to change force required to lift load when using more pulleys in various setups. Wikipedia - Pulley They may also work with inventing their own design of the pulley, to meet principle while being as simple and compact as possible. Audiences Function of the pulley block is usually part of curriculum of secondary schools (11-year-old pupils). Complex pulley blocks and designing your own pulley can be task for older students. Preparation Study of fundamental principles of Archimedes pulley. Material: meters of rope with diameter of 5-8 mm, steel rod with diameter of 4 mm and length of 500 mm, and a 3D printer are needed. Tools: hacksaw, hammer, scissors, force measuring load cell can be used. Some burden is also required. Steps Students first create a pulley with one wheel and measure what force is needed to pull and how long piece of rope is needed to pull out. They will continue adding additional wheels to pulley and measurements will be repeated. Because the pulley block can be assembled in many ways, students can search as many variations and test and describe their advantages and disadvantages of their design. Results Students of lower grades can construct various pulley blocks with a pulley from this project and only define the number of wheels of pulley. Students of higher grades can design their own pulley.