The ash fertilizer making machine is responsible for processing oil palm empty fruit bunches (OPEFB) or waste and converting them into ash fertilizer. The current study was carried out to achieve to achieve an appropriate design and simulation for obtaining an optimal machine design. The design process consists of two processes, including the chopping and the combustion. The simulation process is implemented on the frame design and blade shaft. It applied specifically to the blade using variations in the OPEFB load during the chopping process. The frame design has dimensions of 1000 mm length x 1190 mm width x 800 mm height. The frame is made of European standard (UNP) 65 iron and 50 mm x 50 mm angle iron with a thickness of 3 mm using mild steel material. The calculation results indicate that the designed machine uses a 23-horsepower diesel engine to drive the blade at a rotation of 2200 revolutions per minute where the blade is rectangular with an angle 45° of inclination. The combustion process uses liquefied petroleum gas to burn OPEFB and is assisted by a blower to accelerate OPEFB into ash. This study conducted simulations on the machine frame and machine blades using SolidWorks Simulation. The simulations were performed as static tests to obtain the distribution of displacement and yield strength. The results for the frame show a maximum displacement (9.565e-02) mm and yield strength (4.189e+07) N/m2, while the results for the machine blade indicate a displacement (9.455e+00) mm and a yield strength (5.300e+08) N/m2.
