Drawing Media, Filing, Storage, and Reproduction
After studying this chapter, you will be able to: • Understand the term drawing media. • Discuss the standard drawing formats. (3-1) (3-1) (3-1)
• Describe the inch- and metric-based standard drawing sizes.
• Describe zoning, marginal marking, title blocks, item lists, change tables, and auxiJiary number blocks.(3-1) • Understand the importance of filing and storage systems in an engineering department. (3-2) • Describe how to store original drawings, microfilm, and diskettes. • Discuss the different ways to reproduce drawings. (3-3) (3-2)
DRAWING MEDIA AND FORMAT
The term drawing media in this text refers only to the material on which the original drawing is made. The choiceof material depends on the reproduction process to be used to make prints from the original drawing. Reproduction processes are covered in Unit 3-3, page 38. In the past, the most popular method of producing prints from an original drawing was the diazo process. This method requires that the original drawing be made on a translucent material, for it depends on light being transmitted through thedrawing media. Advances in technology have introduced other methods of producing prints from drawings made on plain paper. For example, all offices are now equipped with photocopying machines and scanners. Drawing media come in a wide range of qualities—strength, erasability (for manual drafting), performance, translucency (if the diazo process is used), and so on. Drawing media differ widely; arange of qualities and characteristics is available so that the perfect material for specific drawing requirements can be found. Keeping in contact with your supplier for new and improved products is good practice.
Standard Drawing Sizes
Inches Drawing sizes in the inch system are based on dimensions of commercial letterheads, 8.5 X 11 in., and standard rolls of paper or film, 36 andChapter 3
D r a w i n g M e d i a , Filing, Storage, a n d R e p r o d u c t i o n
- H l — . 2 5 O R 1.00 25
SEE N O T E BINDING E D G E — .
-BORDER L E N G T H -
B OR A3 -•-.25 O R 1.00 50
— . 3 7 5 O R 1.00
;——r FOR BINDING
D OR A l
INCH D R A W I N G S I Z E S
DRAWING SIZE A B C D E BORDER SIZE* 8.00 X 10.50 10.50 X 16.5016.25 X 21.25 21.00 X 33.00 33.00 X 43.00 OVERALL PAPER SIZE 8.50 X 11.00 11.00 X 17.00 17.00 X 22.00 22.00 X 34.00 34.00 X 44.00
-.50 O R 1.00
— . 5 0 O R 1.00
NOTE: INCH DRAWING PAPER SIZES S H 0 W N . METRIC DRAWING PAPER A L L O W S 20 m m FOR BINDING EDGE A N D 10 m m FOR REMAINING B0RDER SIZES.
METRIC DRAWING SIZES (MILLIMETERS)
DRAWING SIZE A4 A3 A2 A1 AO BORDER SIZE* 190X 267 277 X 390 400 X 564 574 X 811 821 X 1159
OVERALL PAPER SIZE 210 X 297 297 X 420 420 X 594 594 X 841 841 X 1189
Standard drawing sizes.
42 in. wide. They can be cut from these standard rolls with a mínimum of waste (Fig. 3-1).
Metric Metric drawing sizes are based on the AO size, havíng an área of 1 square meter (m ) and a length-to-widthratio of 1:V2. Each smaller size has an área half of the preceding size, and the length-to-width ratio remains constant (Fig. 3-2). These limits will be determined by the space that the object to be drawn will require. For example, a full-scale
single-view drawing of a small object will require only a small drawing size. A larger drawing size will be required to prepare a full-scale multiviewdrawing of a larger object. There are several standard drawing sizes from which to choose. A n alternative to this procedure would be to draw to full scale and then scale down the finished plot and insert it into an appropriate paper size.
A general format for drawings is shown in Fig. 3-3, page 34, which illustrates a drawing trimmed to size. It is recommended that...