SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Drawing and Specifications of a Workpiece Part drawing and its technical specifications provide the essential basis for process planning. The information comes from a blueprint, a working drawing, or a CAd file. It should 蓝 be explicit to the most minor details. It includes.局部剖视图 图 1. Part configuration. This should consist of necessary and sufficient projections, sections, cutaway views and dimensions in order to illustrate the shape and size of the part 2. Technical specifications. All necessary dimensions and shape tolerances the sur faces finish for all sur faces. and specifications(for instance, the weight check, the balance check, the audio frequency check, etc) should be clearly indicated 表面光洁度 Computer-Aided Design 3. Material. The material of which the part is made should be specified, including required heat-treatment, hardness of the material, detection of defects, if any, and kind of blank (casting, forging etc.)SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Drawing and Specifications of a Workpiece Part drawing and its technical specifications provide the essential basis for process planning. The information comes from a blueprint, a working drawing, or a CAD file. It should be explicit to the most minor details. It includes: l. Part configuration. This should consist of necessary and sufficient projections, sections ， cutaway views and dimensions in order to illustrate the shape and size of the part. 2. Technical specifications. All necessary dimensions and shape tolerances, the surfaces finish for all surfaces, and special specifications (for instance, the weight check, the balance check, the audio frequency check, etc.) should be clearly indicated. 蓝 图 3. Material. The material of which the part is made should be specified, including required heat-treatment, hardness of the material, detection of defects, if any, and kind of blank (casting, forging etc.). 局部剖视图 表面光洁度 Computer-Aided Design