{"product_id":"grain-crusher-school-project-kit","title":"Grain Crusher School Project Kit – Grade 8","description":"\u003cp\u003eA laser-cut wooden kit for the \u003cstrong\u003eGrade 8 grain crusher project\u003c\/strong\u003e: a working, crank-driven trip hammer. Turn the handle and a crank, a connecting rod and a lever lift the hammer 43 mm and bring it down on the grain in the bowl, turn after turn. \u003cstrong\u003eNo batteries and no motor\u003c\/strong\u003e, and it bolts together, with no glue.\u003c\/p\u003e\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\u003cp\u003e40 laser-cut parts and 44 bolts and nuts, packed flat:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e3 mm MDF sheets × 3 (300 × 200 mm each), with every part labelled\u003c\/li\u003e\n\u003cli\u003eM4 bolts × 20, in 5 lengths from 12 to 65 mm\u003c\/li\u003e\n\u003cli\u003eM4 nuts × 19 · M4 nyloc nuts × 5\u003c\/li\u003e\n\u003cli\u003eTwo MDF spanners and a ruler that doubles as a bolt gauge\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor testing, add a little rice or maize of your own.\u003c\/p\u003e\u003ch3\u003eHow the grain crusher works\u003c\/h3\u003e\u003cp\u003eTurn the handle and the crank pin goes round. The connecting rod turns that round-and-round movement into a push and a pull on the beam, and the beam rocks on its pivot like a see-saw. The hammer hangs from the far end of the beam, so it lifts and drops into the bowl and pounds the grain. It is the same idea as an old water-powered trip hammer mill, worked by hand.\u003c\/p\u003e\u003ch3\u003eHow to make the grain crusher, step by step\u003c\/h3\u003e\u003cp\u003eEvery kit comes with a 3D animation of the whole build, so a learner can watch it once and get it right the first time. It takes the build in ten steps:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuild the grain bowl.\u003c\/strong\u003e Foot rings K and wall rings L, bolted to deck H3.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDecks into the front frame.\u003c\/strong\u003e Decks H1 and H2 into front frame A, bolted from the outside.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit the back frame.\u003c\/strong\u003e Back frame B over the other tabs, with a nut in each T-slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuild the beam.\u003c\/strong\u003e Two beam sides C with cross plates J between them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMake the hammer.\u003c\/strong\u003e Four hammer layers E, bolted together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHang the hammer.\u003c\/strong\u003e On an M4 × 35 bolt through the beam, with a spacer ring on each side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount the beam on the towers.\u003c\/strong\u003e On the long M4 × 65 bolt, with four rings on each side.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuild the crank.\u003c\/strong\u003e Crank webs F1 and F2, with the crank pin and the axle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit the crank and handle.\u003c\/strong\u003e The axle out through frame A, and handle arms G1 and G2 on the end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect the rod.\u003c\/strong\u003e Connecting rod D from the crank pin up to the beam.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eThe full walk-through, with how the mechanism works and how to write the design brief, is here: \u003ca href=\"\/blogs\/guides\/grade-8-technology-project-grain-crusher\"\u003ehow to make a grain crusher for the Grade 8 project\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eTesting it\u003c\/h3\u003e\u003cp\u003ePour a little rice or maize into the bowl and turn the handle. The hammer lifts 43 mm on every turn and pounds the grain. If the handle feels stiff, a moving joint is too tight: back its nyloc nut off a little.\u003c\/p\u003e\u003ch3\u003eSize when built\u003c\/h3\u003e\u003cp\u003e324 mm long, 92 mm wide and 240 mm tall.\u003c\/p\u003e\u003ch3\u003eMaterials\u003c\/h3\u003e\u003cp\u003eEvery part is cut by laser from 3 mm MDF and labelled. The joints are bolted T-slots: a nut sits in a T-shaped slot and the bolt goes into it, so the model is strong, needs no glue, and can be taken apart again. The moving joints use nyloc nuts, which do not work loose.\u003c\/p\u003e\u003ch3\u003eTest-fitted before it's packed\u003c\/h3\u003e\u003cp\u003eWe build every kit once by hand before it is packed. If a part doesn't fit, that's on us, not on your learner.\u003c\/p\u003e\u003ch3\u003eBuilt for Grade 8 Technology\u003c\/h3\u003e\u003cp\u003eDrawn in our own workshop for the Grade 8 Technology grain crusher project, under Mechanical Systems and Control. See all \u003ca href=\"\/collections\/grade-8-technology-projects\"\u003eGrade 8 Technology projects\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhere can I buy a grain crusher project kit?\u003c\/strong\u003e Right here. Order online and we deliver to homes, schools and shops across South Africa from our workshop in Gauteng.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it the whole Grade 8 grain crusher project?\u003c\/strong\u003e It is the model. The design brief, the drawings and the answers on the task sheet are still the learner's own work, and the \u003ca href=\"\/blogs\/guides\/grade-8-technology-project-grain-crusher\"\u003ebuild guide\u003c\/a\u003e explains the crank, the rod and the lever in plain words to help with that.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it need batteries or glue?\u003c\/strong\u003e Neither. It works by hand, and it bolts together.\u003c\/p\u003e\u003ch3\u003eDelivery\u003c\/h3\u003e\u003cp\u003ePacked in one flat box in Gauteng and shipped to homes, schools and shops across South Africa and Namibia. Standard delivery anywhere in South Africa is R65. Delivering to Namibia? \u003ca href=\"https:\/\/wa.me\/27782020786?text=Hi%20Slotbok%2C%20I%27d%20like%20to%20ask%20about%20delivery%20to%20my%20town.\" target=\"_blank\" rel=\"noopener\"\u003eWhatsApp us\u003c\/a\u003e with your town for the cost. Buying for a class or a shop? \u003ca href=\"https:\/\/wa.me\/27782020786?text=Hi%20Slotbok%2C%20I%27d%20like%20to%20ask%20about%20class%20sets%20and%20wholesale.\" target=\"_blank\" rel=\"noopener\"\u003eAsk about class sets and wholesale\u003c\/a\u003e.\u003c\/p\u003e","brand":"Slotbok","offers":[{"title":"Default Title","offer_id":67865706561750,"sku":null,"price":289.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/8191\/8678\/files\/grain-crusher-trip-hammer-wooden-kit-01-main.jpg?v=1793725246","url":"https:\/\/www.slotbok.co.za\/products\/grain-crusher-school-project-kit","provider":"Slotbok","version":"1.0","type":"link"}