Daniel, Tilahun (PhD)Henok, Shiferaw2018-12-142023-11-182018-12-142023-11-182018-12http://etd.aau.edu.et/handle/12345678/15115Harvesting is the process of collecting the mature crop from the field. Harvesting operation includes cutting, laying, gathering, transporting, stacking the cut crop. The mechanization of harvesting operation is essential to minimize the cost of harvesting, crop production cost, crop loss, turnaround time, weather risk, and to increase benefit by appropriate technology. In order to achieve the above goal, a manually controlled reaper machine is designed and developed which are support to the Farmers and it will reduce the cost of crop cutting and collecting in field and it will achievable highest performance under the given constraints. Research methodology consists of series of actions or steps necessary to effectively carry out research and the desired sequencing of these steps. Identify Statement of the problems, Studying the present design of the reaper machine, Review the literature, Product development generic design process steps for reaper harvesters machine, planning, concept development, system-level design, detail design, testing and refinement and product ramp-up, in this step it’s define the material properties according to the design. to model the reaper machine by using Catia software, Prototype development, testing for validation and Interpret and report. Material are selected on the basis of strength requirement of various components of the Reaper machine. The machine is constructed from locally available materials. This selfpropelled reaper is operated at forward speed of 2.54 m/s. It has 120 cm size of cutter bar and dropped bundling mechanism. The field capacity 0.306 ha/hr, respectively. The required labor for harvesting one hectare of wheat and rice reaper harvesting field operation are needs 2 man-hr/ha. The quantity of fuel required to fill the tank fully after harvesting the plot was measured to determine the quantity of fuel consumed for reaping the test plot and fuel consumption 1.17 l/h.en-USReapers Machineharvesters machineThesis