Monjolo: Primitive water mill

thingiverse

This is a primitive water mill model. It a fairly simple machine that works with just water dripping. It's perfect practical lesson for kids. This model was made to be used as an educational resource to teachers who want to discuss about physics that involve the cycle of this machine. It can also shown how it was used in the past and is still being used today in some remote places. Print Settings Printer Brand: RepRap Printer: Aluminum Mendel Rafts: No Supports: No Resolution: 0.2 Infill: 50% Notes: I printed with 50% scale, but ideally I designed to be built full scale, so the inertia of the water flowing down does not keep the monjolo(seesaw like object) from cycling. Project Project name Monjolo: Primitive water mill Overview & Background You will learn how torque works on a pivotal, free moving, seesaw-like machine. You don't need any background to built this project. You can go deep about into the relation between torque and the angles of the monjolo, learn more about why this machine design is so cheap and it is still being used this days at some places. Objectives Is expected from students that they learn about torque and its application in real world. Audiences You can teach this to any grade, but to teach all details about the physics behind this machine you will need to teach to at least 5th grade students. You can also teach how to hack the monjolo(seesaw like object) adding or subtracting weight to it. You can still teach them where did it came from and why it's so simple and cheap, and why people still using. Subjects History, math, physics. Lesson/Activities Step 1: Print the base and the monjolo, you can scale down bu not more than 70% of it original size. Step 2: Make a dripping system You can use any dripping system you want but keep in mind that you need to control the speed and the size of the drop need to be normal as a medicine drop. For a constant drop you can use a soda PET bottle, a drip nozzle from 3DPonics that I will add the stl file and the link. Then you connect that nozzle to a intravenous tube that is used at the hospital. That tube usually comes with a flow regulator that you can control dripping. The picture of this device is attached if you don't know what it is. Step 3: To put it to work, sometimes, you will have to add an extra weight as I did on my print, so that way the weight of the hammer side is heavier than the bowl side of the monjolo(seesaw like object). You can do it as you prefer. For practical purposes you can add a layer of double sided tape on top of the monjolo hammer so you can stick and take out the counterweight. Step 4: If you did not have to stick a double sided tape you can do now if you want to stick another counter weight to teach your kids how the position of the weight affect. Step 5: Finally put something to mill under the hammer into the base bowl. Duration When you pre-set this machine with the dripping mechanism all set up, you just need to set all on the table and show to your class Preparation This is a interactive presentation, so you don't need nothing but your students attention and curiosity. References http://www.thingiverse.com/thing:376158/#files - Link to the 3DPonicshttp://www.antonine-education.co.uk/Pages/Physics_2/Mechanics/MEC_03/Mechanics_Page_3.htm-link to torque basicshttp://www.ebay.com/bhp/iv-tubing - Intravenous tubing for dripping control https://youtu.be/byhdEwHi3wo- monjolo working