A maize thresher is an agricultural machine designed to separate maize kernels from dried cobs quickly and efficiently. It consists of a feeding hopper, a rotating threshing drum fitted with spikes or teeth, a concave screen, a cleaning blower, grain collection outlets, and an electric motor or diesel engine for power. The machine is built to handle large volumes of maize while minimizing grain damage and reducing labor requirements.

In operation, dried maize cobs are fed into the hopper and directed into the threshing chamber, where the rotating drum strips the kernels from the cobs through impact and friction. The separated grains pass through a screening and cleaning system, where a blower removes dust, husks, and other light impurities. Clean maize kernels are then discharged through a collection outlet, while empty cobs and waste materials are expelled separately. Maize threshers are widely used by farmers, cooperatives, and grain processing facilities to improve harvesting efficiency, reduce post-harvest losses, and increase productivity.