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Please use this identifier to cite or link to this item: http://hdl.handle.net/10087/10055

Title: レーザー加工によるアクリル製試験管立ての製作と実験教育効果
Other Titles: Production of Acrylic Test Tube Racks by Laser Beam Machining and Their Contribution to Experiment Education
Authors: 齋藤, 喜泰
Saitoh, Yoshiyasu
浅見, 博
Asami, Hiroshi
栗原, 礼乃
Kuribara, Ayano
田部井, 由香里
Tabei, Yukari
藤重, 昌生
Fujishige, Masao
Issue Date: 15-Mar-2016
Publisher: 群馬工業高等専門学校
Citation: 群馬高専レビュー,(34),15-19
Abstract: As a part of activities to improve the skills of technical staff members through exchange with staff in other disciplines, mechanical engineering staff members were assigned to a Chemistry and Materials Science Experiment Course (qualitative analysis) offered to first year students of the Department of Chemistry and Materials Science. Asking the mechanical engineering staff members to perform assignments as efficiently as experienced chemical engineering staff without any preparatory measures would have been unreasonable, in addition to the fact that the assignment already put mental pressure on both the group dispatching the mechanical engineering staff and the group receiving them and caused feelings of uneasiness in both groups. To dispel the uneasiness, various efforts were repeatedly made; for example, teaching staff members elucidated and explained in detail to the mechanical engineering staff members about the four themes of the experiment course, which they would work on over the course of a semester, and the mechanical engineering staff members conducted preparatory experiments with the teaching and chemical engineering staff members. By its nature, the experiment course required its participants to conduct extensive observations. It was felt that there were many experiment phenomena which could be noticed only after they had been explained. These included cases where, for example, observation was very difficult because barely visible precipitate formed in the solution inside a test tube, but became transparent when the test tube was shaken, or where after the precipitate had dissolved, it transformed into crystalline precipitate when it was recrystallized. Furthermore, the mechanical engineering staff members were taught that in some cases, it was very important to observe different deposits and compare them with each other. During the regular experiment classes, the staff members are very busy carrying out their duties, such as preparing chemical reagents, receiving reports, and monitoring and managing students’ safety and the progress of their experiments. Test tube racks for small test tubes used for the department’s student experiment classes were blackened, and some 3 mm long sections between test tube holes were corroded and had disappeared due to more than 30 years of aging deterioration and degradation by chemicals and other materials. However, the experiment staff members could not afford to take the time to solve the test tube racks’ problems due to being so busy and under budgetary constraints. The test tube racks were not commercially available goods, but hand-made products created by a craftsman. Therefore, even if a decision to replace them with new ones was made, arranging for the replacements would be problematic. According to the results of the preparatory experiments conducted by the staff members, it was hard to detect a minute amount of precipitate as well as to observe the colors, crystallization and other precipitate characteristics with the test tube rack because the rack’s upper plate creates a shade while the blackened bottom plate reduces reflectivity, leading to an insufficient amount of light reaching the test tubes inserted in the rack. While the wooden test tube racks were hand-made by a craftsman, the authors proposed new designs from the point of view of the mechanical engineering staff, using stainless steel, acrylic and other plates to produce prototypes, and a laser beam machining tool to finely process acrylic plates to mass produce new rack units to be used in class. In this report, the authors describe their activities to design and manufacture new acrylic test tube racks, and use them for an experiment class. Furthermore, the authors report that the acrylic test tube racks contributed to improving test tube observation results as expected and that this technical staff exchange between different disciplines was successful.
URI: http://hdl.handle.net/10087/10055
ISSN: 0288-6936
Appears in Collections:第34号(2015)

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