50 Machine Trades Print Reading Copyright Goodheart-Willcox Co., Inc. Drawing Number The drawing number is the identifi cation number used for referencing, fi ling, and archiving a drawing. Most fi rms assign a drawing number using a designated system based on their needs. Numbering systems use a code of numbers, letters, and dashes to represent departments, drawing dates, project numbers, and part numbers, as shown in Figure 4-5. Drawing numbers are typically located at the lower-right corner in a title block. Refer to Figure 4-4(E). Margin Drawing Number Block The margin drawing number block is used for placing a drawing number along the sheet border in the margin area. Refer to Figure 4-2(9). The block includes a drawing number, a sheet number, and a revision character, as shown in Figure 4-6. A margin drawing number can be located on the border in the upper-right or lower- right margins of a drawing. Placing a drawing number in a margin is optional. However, margin drawing numbers allow the information to be visible on folded or rolled drawings. Revision Block Revisions are any changes made to the original drawing. Drawing revisions improve part design, clarify details, change dimensions, correct errors, reduce costs, and change manufacturing procedures. The revision block allows quick reference to the current drawing revision. The revision block is generally located in the lower-right corner of a title block, as shown in Figure 4-4(F). Letters designate a revision, but numbers are also used. It is becoming more common to exclude the revision block from the drawing sheet and store the revision history digitally. Detailed revision information is stored in a digital document. The revision history is identifi ed by a letter after the drawing number in the title block. Goodheart-Willcox Publisher The standard components of an ASME standard title block. See text for letter references. Figure 4-4 A S B C D E F G H I J K L M N O P Q R Storing and identifying large drawings can be challenging. A common storage practice is to fold large drawings, such as a D-size or E-size, down to an A-size. This keeps the name and drawing number accessible from the outside of the folded drawing. Rolling-up drawings can also achieve the same results. The proper way to roll a drawing is to start at the end opposite of where the drawing title and number are located. Next, with the printed side facing out, roll the drawing along its length. When finished, the identification information will be accessible from the outside of the roll. These practices make for easy identification of stored drawings. More companies are now storing drawings digitally. A hard copy of the drawing is only printed when needed. This eliminates the need for large amounts of physical storage space. It also simplifies the process of sending out drawings, as they can simply be e-mailed to the recipient. PRO TIP
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