A human-powered machine that shells maize cobs using a bicycle pedal drive. Pedaling spins a shelling drum against an adjustable concave grate; kernels are rubbed off and fall through a screen to a collection tray while empty cobs exit from the end chute. A flywheel smooths motion and a freewheel prevents kickback. Ideal for off-grid farms, SHGs, and small agri-entrepreneurs.

Parts Used:

1. Pedal Module: Bicycle frame section with crankset, pedals, bottom bracket
2. Drive Train: Chain + sprockets (ratio selection), freewheel, optional V-belt stage
3. Flywheel: 3–6 kg for steady torque
4. Shelling Drum: Mild-steel drum with rubberized/knurled/pegged surface
5. Concave/Grate (Adjustable): Curved perforated plate; clearance lever
6. Sieve/Screen: Separates kernels from chaff; removable for cleaning
7. Hopper & Chutes: Top feed hopper; kernel outlet; cob discharge chute
8. Bearings & Shafting: Pillow-block bearings, keyed shaft, couplings
9. Frame & Guards: Welded MS frame, chain/belt guards, dust hood (optional)
10. Bins & Bag Clamp: Kernel tray or bagging spout; cob collection bin
11. Optional Add-ons: Tachometer, dust extractor port, alternator for light/phone charging