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 ExperimentStall Torque 0.2Nm

Grated Area 30cm2

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

ModelBicycle driven gear

Hopper

Grated Manioc Exit