The aim of this research is to create the center of mass testing machine for vehicles with maximum mass 3000 kilograms. By the performance of this machine is able to determine the center of mass 3 axis by horizontal longitudinal and vertical. On the other hand the verities of mass from 50 to 100 kilograms and the several of weight distribution at horizontal and longitudinal are applied to the condition of testing for reasonable to the position of the center of mass. The result of research discovered to the performance of center of mass tester was activated following to test conditions. Furthermore the weight distribution at longitudinal was the highest effect to the horizontal center of mass. By the way the value of weight distribution at horizontal is more effects to the longitudinal center of mass. Moreover increasing of mass was impact to the vertical center of mass and it’s independent to the position of weight distribution.

This research is designing and construction an apparatus of deflection of fixed end beam under uniformly distribution load. SolidWorks program is used for structure designing and CosmosWorks program is used for strength of structure analysis. Deflection and strain of beam were compared with the result of mathematical model according to function stress principal. Error of mathematical model result does not exceed 10%. Therefore this apparatus can be used as prototype and produced for education purpose.

In the procedure processes of Robusta coffee initial from bring the green coffee after dried and removed the outside shell and bring it to separating process. The sale price depends on the size of green coffee. If their size of still standard the sale price have been increased. Most of the separating process is majorly with the labor experience. Based on human experience the error with operating and working time is increased. In this reason we will study to the criteria of Robusta coffee for designing and creating the Robusta coffee bean separator machine for Robusta size standard testing. The separator machine consists of the three-layer cylindrical sieve set and the diameter of the layers was 4 6 and 7.5 mm. respectively. For the standardization of Robusta coffee bean is controlled by size of hole sieve. In this research considers to 4 importance parameters by the efficiency of sorting out standard of green coffee Specific Energy Consumption [SEC] and assessment way economic engineering. The result of research shows that the maximum efficiency of green coffee separating is 164.7 kg/hr under the condition of testing with 14.4 rpm at 4 angle incline. In term of standard it found that the machine can separated only for standard and smaller than standard size of green coffee and the maximum moistness are 9.9%. For the least Specific Energy Consumption [SEC] is 0.01631 MJ/kg and occur with the same condition of experiment. Based on this condition the Break-Even Point must be sorting out with 1070550 kilogram per year and Payback Period will occur at 3.598 years. However the quantity of separating or the efficiency of machine is mainly effect to Break-Even Point and Payback Period.

In Thailand the many agricultural products are exported to the world market. The dry foodstuff is very popular to transfigure for value increasing. The tamarind paste can be processed to many products such as stirred tamarind candy tamarind and tamarind juice. For the tamarind juice has been used for cooking and mixing in many foods. For the Thailand factory the process to make tamarind juice start from chosen the tamarind paste separated the flesh and heating. However all processes are made by manually. Furthermore the quality of tamarind juice is incompletely-controlled based on operator experiences in order to achieve the damage and quantity decreasing. Based on this condition the process it needs to resolve a problem though engineering knowledge by using the tamarind mixing machine. The tamarind mixing machine consist of electric motor 1 HP 220 Volts AC 1425 rpm gear box ratio by 1 :40 gate agitator blade and two layer bucket with inside and outside diameter is 0.5 m. and 0.6 m respectively. In the system is operated by the electric motor transfer the power though gear box with 35.6 rpm for driving the blade and give the heat by LPG. While within the outside layer of bucket contain some water for transferring the heat to product in inside layer of bucket. The results of experiment with 70 kilograms of tamarind paste by using 0.7 kilograms of fuel. Based on using the convection of water at suitable temperature and period time at 80?C and 65 minutes respectively it found that the quantity of tamarind juice is increased by reducing burnt when compared with the original process and also illustrated to be convenient using.