The objective of this work is to study the effect of the surface roughness on the measured hardness. The preparation of the surface roughness level complied with the ISO 1302: 1992 standard. There are many factors influencing surface roughness such as building mac uncry feed rate speed machine settings cutter and water cooling. The surface roughness C.tU. by these factors will have influence on the measured hardness of materials. The SKS3 is used as material in this study. Surface of the work piece was adjusted with different roughness val es divided following four levels: 12-50 urn rough machined 1.6-6.3 urn smooth turned 0.2-0.8 urn and 0.025-0.1 um. Then all the adjusted roughness work pieces were harden. After the Harden process the hardness of all work pieces were 62-64 HRC. From the measured hardness results it was found that the standard deviations are 4.665 1.0310.530 and 0.407 respectively with surface roughness value. Therefore it can be concluded that the standard deviation of hardness increased when the surface roughness increased

The purpose of this study was to study and compare The Learning Problem of Student in faculty of business administration at Rajamangala University of Technology Phra Nakhon in 5 aspects : curriculum instructional learn environment instructors and students . The student were classified by gender educational background major subjects student achievement and time of study. The samples in this research were 200 students. The 82 item questionnaires of Likerts rating scales was used as the research instrument. Percentage mean standard deviation t -test for independent sample F -test and LSD analysis were statistical method to analyze data. The results were as follows: 1.The Learning Problem of Student all aspects were in the low levels that learn environment the highest while instructional curriculum instructors and students was in the second rank. 2.There was significant difference for the learning problem of student in curriculum and learn environment at the 0.05 level among students in different gender. 3.There was significant difference for the learning problem of student in students at the 0.05 level among stUdents in different educational background and student achievement. 4.There was significant difference for the learning problem of student in instructional learn environment instructors and all aspects at the 0.05 level among students in different time of study. 5.There was significant difference for the learning problem of student in curriculum instructional learn environment instructors and all aspects at the 0.05 level among students in different major subjects.

Product development of End Mills AISI M42 tool steels products by cryogenics treatments after process by heating system through austenite structure had been conducted in order to increase effectiveness of wear resistance geometry designed in quenching figures quality of chip flow and improved by the cutting edge with sub-zero and heating system through producing the cutting tools on the rim of rake angle at 8° and 12° and 15° austenite temperature at 1210 ° C varied in room with temperatures at 35°C lower - 70 °C and -196°C respectively. The tempering at 535°C had been three time. End Mills figures then had been operated by 5 axis CNC grinding machine for the tools. The experiment had been conducted in accordance with the AISI 1045. Such as result revealed that stress relive of tools. it hardness between 67.7 up to 68.3 HRC and reduced I HRC. Having compared with the un-stress relief it revealed that on the 15° rake angle shear force increased 8° and 12° respectively. The result had denied the Shear theory however resisted against erosion better than 12° and 8°. The result revealed that cooling at - 196°C would help increase more 15% of cut effectiveness. Cooling treatment below 0° had tended to positively resist the erosion of the out tools. With its development of control of degrees of cooling substance acid the quality of products would be better increased. Such a result could be based of the development of product lines on highly-qualities cut tools which was domestically produced.

This research was aimed to develop criteria for quality evaluation of OTOP products of 5 types; namely food product beverage product cloth and costumes product utensils decoration and souvenirs product and herbal product. Which is not food Then the developed criteria were used as a quality evaluation form for OTOP products in interactive system on website. The usability of the system was tested by 72 persons in the group of OTOP product entrepreneurs and 96 persons in the group of customers. The results from the development of 5 types of criteria for product quality evaluation showed that: the criteria for food product consisted of 282 items; beverage product consisted of 41 items; cloth and costumes product consisted of 47 items; utensils decoration and souvenirs product consisted of 27 items and herbal product which is not food consisted of 77 items According to the usability tested by the entrepreneurs it was found that the effectiveness of usage was at the highest level. As for the usability tested by the customers it was found that the effectiveness of usage and the learnability were at the highest level.