数控技术应用专业英语第三版电子教案LS1LS13

学习情境1LS1 CNC Lathe Machining班 级　　学习任务3Task 3 CNC Program for Lathe日月　　学 时　　Knowledge objects1. To r

数控技术专业英语教案 学习情境1 班级 LS1 CNC Lathe Machining 日 3 学习任务 月 Task 3CNC Program for Lathe 学时 Knowledge objects 1. To read and learn the knowledge about CNC program for lathe. 2. Grasp the method of programming. 3. Use the program code correctly. 4. Master the grammatical structures. Ability objects 1. Help the students to learn some phrasal verbs and functional items about program for CNC lathe and try to use them. 2. Strengthen their abilities of reading. 3. Improve the ability of getting specific information from reading the text. 4. Improve the ability of analysis and solving problem. 5. Have team sprit and responsibility. Teaching Methods Speaking ;Discussing ;Pair-work &group- work Teaching aids: Multi-media computer; PPT Teaching content Remarks Part ATechnical Reading 1. Preparing for CNC lathe program, 1Coordinate systems （） Machine coordinate system (MCS) 机床坐标系 重点学习机 床坐标系和 Workpiece coordinate system (WCS) 工件坐标系 工件坐标系 Local coordinate system (LCS) 局部坐标系 2Program zero （） One of the main benefits of using the rectangular coordinate system is that many of the coordinates used within the program can be taken right from the print. 【 使用直角坐标系编程的主要好处是：程序中要用到的许 】 多坐标都可以直接从图纸中得到。 The placement of program zero is determined by the programmer. The program zero of alathe is generally set in the midpoint of the workpiece’s right surface (Fig.1-3-2). 1