Pedal-Powered Food/Grain/Coffee Mill

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Short Description

  • Problem: Lack of electricity or lack of an electrical grinder.
  • Idea: Combine a bicycle and a hand mill to a pedal-powered mill.
  • Difficulty:
  • Price Range:
  • Material Needed: Bicycle, metal bars, wood, hand-operated mill, welding device
  • How Many people?
  • How Long does it take?

Concept

Pedal Mill
The machine is easy to operate, easy to maintain and reasonably portable. It can be used anywhere by virtually anyone. It is also a simple matter to switch from degraining to milling by unbolting one appliance and attaching the other.The Mill function has the capacity to mill 3 lbs. per minute of any type of grain or coffee beans. The most common use is for milling yellow maize, soya beans, and other elements that make up animal feed. The Corn Degrainer for example is used postharvest and easily degrains 1200 to 1500 lbs per day.

How to Build the Mill

The Mill
Pedal mill

Adapting the mill

The interchangeable thresher and the degrainer adapted to pedal power

The Chassis
[[]] Bike frame alligned and how you can form a better bond for the chassis' welding.
The bike frame is cut as above. The frame shown in the pictures has a 450mm eat tube, 250mm down tube. The full length of chain stays.
Form the 90 degree corners as shown, cutting, folding and welding the angle iron. Weld the bike frame in place, lining up the sprockets so the chain will run straight. You will need to bend the drive-side chain stay in order to clear the chain. To form a better bond, the frame is flattened and bent before welding it to the chassis. File any sharp edges and paint. Pedal mill

The Flywheel
Pedal mill
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Pedal mill

Pedal mill
The concrete is painted to protect from moisture. One side accepts a multi speed cassette, the other a single speed sprocket. The axel position will need to be adjusted accordingly.

The Seat
Pedal mill
The seat shown in the picture is recycled plywood. The support is made from thin box section steel. There is a simple bracket in order to make the seat position adjustable. The nut is welded in place for easy tightening. The seat can then be painted.

The Handlebars
Pedal mill
We use steel dropped racer bars. Cut them in half. In order to bolt on the hangle bars, we weld 8mm bolts onto 20mm washers.

The Chain Assembles
Pedal mill
Pedal mill
These are then welded onto to cut ends of the handlebar and filed smooth. They are then ready to be bolted onto the chassis. The drive side derailleur is bolted in place as it would be on the bike. However it will need to be filed to fit flush with the frame. We use the old style of derailleur that bolts onto the axel rather than the bike frame. Now you can add a gear shifter. A simple friction type is best than an index shifter. Use the adjust- ment screws on the derailleur to make sure it se- lects all gears without the chain coming off.

- tion before drilling the frame and bolting. Aim to have the chain run as straight as possible.

Success Story

Guatemala

References and Further Reading


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