Sketch Model Review Small scale agriculture Manioc Grater What is - - PowerPoint PPT Presentation

Sketch Model Review

Small scale agriculture

Manioc Grater

What is Manioc?

• a.k.a. Cassava, Yucca Root
• Widely grown & consumed in

Africa, Asia, Latin America, the Caribbean

• 3rd most important source of

calories in the tropics; high in protein, vitamins A & B

• Vital source of food security &

income generation

Customer Information

• Developing countries: Haiti,

Nigeria, Tanzania, Ghana, Mozambique, Uganda, Democratic Republic of Congo.

• Grown by poor farmers, many
• f them women
• Currently use time-consuming

and laborious process

• Uses:
• Replace wheat flour
• Animal feed
• Binder in charcoal

Market Data

Source: Food and Agriculture Organization of the UN

• Manioc market historically neglected
• Global Cassava Development Strategy:
• 1. Increase sustained production in

growing markets

• 2. Guarantee uniformly made product
• 3. Provide international consumer market

with competitive prices

• To do the above, must first:
• Shred manioc faster

(1 manioc / min, vs.1 in 45 min now)

• Develop way to preserve it

Attempted Alternatives

• Rotary Grater

– Williams-Sonoma – could not grab material – Came out a sticky pulp – Clogged the grater

• Food Mill

– Crate and Barrel – Difficult to fit Manioc – Fell apart; not flexible – Did not remove material.

Shredding Theory

• Smaller teeth mean fewer

jams, smaller pieces, less force required.

• Without holes, less likely

for the manioc to clog the system.

• Rotating shredders allow

continuous force.

• Low-speed shredders

have been demonstrated as effective on a large range of materials.

http://www.ssiworld.com/things/things9-en.htm

The Shredder

Manioc Grater Analysis

• Keep pursuing the idea
• Increase blade number

and decrease spacing

• Ultimately, shred into

much smaller pieces

• Attach to bicycle, to

achieve pedal power

• Goal: 1 manioc/min
• Investigate production

methods using cheaper components