Maize is the third most important crop in India having more than fifteen million cultivators. The maize threshing is generally done by power operated machine or by manual method of dehusking by hand and shelling by tubular maize sheller. In India, a major farming population belongs to small and marginal category, the tubular maize sheller is getting popularized. But this is a labour intensive and time consuming process. In tribal areas, there are constraints of using electrical and mechanical power source and bullock is main source of power for farming operations. The present study was undertaken to develop a maize dehusker cum sheller operated by bullocks in rotatry unit. The machine was designed mathematically and a model was developed to analyse the stress and deformation of its different components under dynamic loads. Based on the analysis, machine was fabricated in the laboratory and performance was evaluated taking three different varieties of maize i.e. CP818, P 3401 and DKC 9126. The throughput capacity of the machine was calculated to be 2.34 q/h. The machine performance was evaluated for three different moisture content range i.e. 7.2-9.1 per cent, 9.5-11.6 per cent and 12.3-14.9 per cent. The cylinder peripheral speed was varied by changing the size of driven pulley of the threshing cylinder shaft. From evaluation, it was observed that maize variety had no effect on machine performance. However, shelling efficiency, blower loss and broken grain percentage was found to be increased with decrease in moisture content as well as increase in cylinder peripheral speed. The dehusking efficiency was observed to be increased with increase in moisture content. Considering the machine performance parameters, the moisture content of 9.5-11.3 per cent and cylinder peripheral speed of 9.14 m/s was selected to get optimum output from the machine.