tailieunhanh - Dimensioning and Tolerancing Handbook Episode 1 Part 4

Tham khảo tài liệu 'dimensioning and tolerancing handbook episode 1 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 4-12 Chapter Four Figure 4-9 Border title block and revision block Drawing Interpretation 4-13 Size Conventions Most drawings conform to one of the sheet sizes listed below. If the drawing is larger than these sizes it is generally referred to as a roll size drawing. INCH METRIC Code Size Code Size A X 11 A4 210 X 297 B 11 X 17 A3 297 X 420 C 17 X 22 A2 420 X 594 D 22 X 34 A1 594 X 841 E 34 X 44 A0 841X1189 Title Blocks The part of a drawing that has the highest concentration of information is usually the title block see Fig. 4-9 . It is the door to understanding the drawing and the company. Although there are many different arrangements possible a good title block has the following characteristics. It is appropriate for the drawing type. It is intelligently constructed. It is filled in completely. All the signatures can be signed off within a short time frame. Some drawing types will not use all of the following title block elements. For example an assembly drawing may not require dimensional tolerances surface finish or next assembly. Although title block sizes and configurations have been standardized in ASME most companies will maintain the standard information but modify the configuration to suit their needs. Reference Fig. 4-9 for the following standard title block items Company Name and Address Many companies include their logo in addition to their name and address. Drawing Title When the drawing title is more than one word it is often presented as the noun first and the adjective second. For example SPRING PIN is written PIN SPRING. This makes it easier to search all the titles when the first word is the key word in the title. There is no standard length for a title although many companies use about 15 character spaces. Abbreviations should not be used except for the words assembly subassembly and installation and trademarked names. Size The code letter for the sheet size is noted here. See Section for common .