Machinery's Handbook, 31st Edition
CAD/CAM 1395 blocks: a sheet frame, a revision block, a parts list block, and any others needed. Some might be combined into a single block for insertion into a drawing at one time.
Fig. 7. Top: Title Block for A, B, C and G Drawing Sheets Showing Placement of Text Attributes with ASME Standard Dimensions for Creating this Block. Bottom: Completed Title Block Define a Default Drawing Configuration: Drawing features used in a particular type of drawing can be set up in a template file so that default settings, such as text and dimension styles, text size, drawing limits, and initial view, are set up when a new drawing is started. Different configurations can be defined for each drawing type, such as assembly, parts, or circuit drawings. When creating a new drawing, you can use a template file as a pattern or open a template file and use it to create the new drawing. Use Appropriate Detail: Excessive detail may reduce the effectiveness of the drawing, increase the drawing time on individual commands and the overall time spent on a draw- ing, and reduce performance and speed of the CAD program. Wherever possible, sym- bolic drawing elements should be used to represent more complicated parts of a drawing unless the appearance of that particular component is essential to the drawing. Scaling Text on Drawing Sheets: It is usually desirable that text, dimensions, and a few other features on drawings stay a consistent size on each sheet, even when the drawing size is different. The following procedure ensures that text and dimensions (other features as well, if desired) will be the same size from drawing to drawing, without resorting to scal- ing the drawing to fit onto the drawing sheet. Example: Create a drawing sheet having the dimensions of the actual sheet to be output (A, B, C, D, or E size, for example). Use text attributes, such as the title block illustrated in Fig. 7, to include text that needs to be entered each time the drawing sheet is used. Create a block of the drawing sheet, including the text attributes, and save the block to disk. Repeat for each size drawing sheet required. Establish the text and dimension size requirements for the drawing sheet when it is plotted full size (1:1 scale). Use Table 1 as a guide to recommended text sizes. Test the sheet by placing text and dimensions on the drawing sheet. Plot a copy of the sheet to check that text and dimensions are the expected size.
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