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.

การวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาความสามารถด้านการออกแบบและการผลิตของโปรแกรมคอมพิวเตอร์ CAD/CAM จำนวน 2 โปรแกรม คือ โปรแกรม A และ B ซึ่งเป็นโปรแกรมด้น CAD/CAM ที่นิยมใช้ในประเทศไทย แต่มีราคาโปรแกรมที่แตกต่างกัน โดยทดลองการทำงานของโปรแกรมกับการทำงานแบบลายเส้น 2 มิติ จำนวน 3 ลักษณะงาน เพื่อเปรียบเทียบความสามารถในด้านการแปลงข้อมูล (Postprocessor) เป็น NC Code เวลาในการกัดงานและความแม่นยำของชิ้นงานที่ผลิต การวิจัยนี้ทดลองภายใต้เงื่อนไขเดียวกันทุกประการ ผลการวิจัยและทดสอบข้อมูลทางสถิติปรากฏว่า การถ่ายโอนข้อมูลระหว่างโปรแกรม Auto CAD 2002 เข้าสู่โปรแกรม A และ B มีความสมบูรณ์ 100% จำนวนบรรทัด NC Code ที่ผ่านการ CAM และการแปลงข้อมูลจากโปรแกรม A และโปรแกรม ไม่มีความแตกต่างกัน เวลาในการตัดเฉือนด้วยการกัดงานปรากฏว่าโปรแกรม A และโปรแกรม B ไม่มีความแตกต่างกัน ส่วนความแม่นยำของขนาดที่ได้จากลักษณะงานทั้ง 3 พบว่าชิ้นงานที่ผ่านการตัดเฉือนด้วย NC Code จากโปรแกรม A และโปรแกรม B ไม่มีความแตกต่างกัน ที่ระดับนัยสำคัญ 0.05

This research is to study the recycle process of hard materials high hardness type and cemented carbide produced by press forming and sintering process included cemented carbide mixed with tungsten carbide cobalt silicon titanium and others. The research aims to recovery tungsten to use it again. It starts in cleaning and ball milling materials for resizing from length 12-25 mm. width 10-15 mm and thickness 2.5-8.0 mm. then disintegrated with the electric-chemical process filtering metal powder cleaning and drying. The result of dissolved materials with electricchemical process in 85% condensed HCl 6-24 volts and 3-10 amperes. The solution heats up 180 degree Celsius is found that material will be 550 11m of W03 the same as usage of Phosphoric Solution. The result of the study in dissolved materials by using the conductor of electricity is found that usage of cobalt is the best to disintegrate tungsten carbide better than tungsten carbide and stainless steel 10-15%. The result of this research is found that the best practice of tungsten carbide recovery is dissolved materials with electric-chemical process in not over 7N condensed HCl 6.00 volts and 3.00 amperes. The metal powder will be almost 100% pure tungsten carbide and particle sized distribution is 34-360 11m. After ball milling for 24 hours particle sized distribution is less than 60 11m compared with the imported metal powder. It is concluded that the recycle of cemented carbide into tungsten carbide powder qualified for sintering work and produced to the durable hard materials. It ensures that this research is useful for the related industry and the approach for production of tungsten carbide which was instead of the imported metal powder.

Thailand is a well known country where jewelry is produced to export. The process of jewelry production needs many special skills and efficient machines. Moreover the preparation of plaster is also important in producing jewelry. This requires various stages and takes more time to do. However these problems can be eliminated by knowledge in engineering. Therefore this study aimed to develop the vacuum mixer for mixing Investment for jewelry production. The vacuum mixer consists of 12 Hp 220 volts ac electric motor with the gear which has 1:40 dimension. The whole body of the vacuum mixer is made of stainless steel. The pot for mixing the Investment is 21 em. wide and 31.5 em. high. The tub at the base for placing the pot is 29 em. wide and 21 em. high. This base is equipped with a 20 m3 per hour vacuum ventilator and a vibrating motor. This vacuum mixer is operated by the electric motor which transmits power into gear. Then the gears drive the belt to make the blade stiring the Investment and water in the pot until they are well mixed together. Then the mixture is forced to the tub at the base by the valve while the air is sucked up and the mixture of the Investment is cured until all bubbles are disappeared from the mixture. After experimenting the result revealed that the use of the vacuum mixer can reduce the steps in preparing the plaster from 8 steps to 4 steps. It can also save 52% of time allotted.

The purposes oj the research were to create computer assisted instruction for Jewelry Finishing Subject to find out the efficiency validation of computer assisted instruction based on the standard of 90/90 and to analyse the students leaming achievement after using the computer assisted instruction. The subjects in tile study were 17 first-year diploma engineering students enrolling at Rajamangala University of Technology Phra Nakhon. The researcher made the experiment by having the students pretest. Then they studied by using the computer assisted instruction focused on practicing basic turning. After the students had studied and had posttest the efficiency of the computer assisted instruction was calculated as well as the learning achievement was analysed. The research result revealed that the efficiency of the computer assisted instruction was at the standard of 90 1 90. Moreover the learning achievement after using the computer assisted instruction was different at the significant level of 0.05.