Manioc Grater

Idea Help people in developing countries (Haiti) Market: hundreds of millions of people  Haiti  Countries with both large scale poverty and manioc surplus Use bicycle power Produce 1 kg of grated manioc per minute Photo: Myles Crocker, 1993

Background Research “Cassava Grinder” from Nigeria – different market, different needs Also uses bicycle power – shows that it is an effective source of energy Source: AT Sourcebook

Experimentation Used ordinary rotary cheese grinder to look at possibilities with texture variances Used a drill to test feasibility Measured the torque at different levels and determined an effective grater size

Results of Experiment Stall Torque0.2Nm Grated Area30cm 2 Power (assuming 2 rotations per sec) 2.5W Assuming we can run the manioc grater at 100W then the size of our machine should be: Diameter: 15cm Length: 15cm

Model Bicycle driven gear Hopper Grated Manioc Exit