chapter 4 drafting media and reproduction methods
TRANSCRIPT
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Chapter 4
Drafting Media and Reproduction Methods
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Introduction• Manual drawings
– Prepared on precut drafting sheets• Contain printed graphic designs for company logo
and information, borders, and title blocks
• Computer-aided drawings – Created using a template
• Contains a border, title block, and graphic designs for the company
• Stored in files and reproduced on media
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Paper and Films• Factors influencing choice and use of
manual drafting media:– Durability– Smoothness– Erasability– Dimensional stability– Transparency– Cost
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Paper and Films (cont’d.)• Vellum
– Drafting paper specially designed to accept pencil or ink
• Lead on vellum is the most common combination
– Least expensive– Good smoothness and durability
• Not as durable or stable as some materials
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Paper and Films (cont’d.)• Polyester film (trade name Mylar)
– Plastic manual drafting material– More expensive than vellum– Excellent durability, erasability, dimensional
stability, and transparency– Drawing is best accomplished using ink or
special polyester leads
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Paper and Films (cont’d.)• Polyester film (cont’d.)
– Single- or double-matte surface• Matte is a surface texture that is not glossy• Manual drafting is done on a matte surface• Double-matte has texture on both sides• Single-matte has a matte surface on one side and a
slick surface on the other
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Manual Drawing Reproduction• Reproduction
– Most important factor in media selection– Combination achieving best reproduction:
• The blackest, most opaque lines or images on the most transparent base or material
– Especially important with sepias• Second- or third-generation originals
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Manual Drawing Reproduction (cont’d.)
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Sheet Sizes, Sheet Format, Title Blocks, and Borders
• Sheet sizes– Drafting materials come in standard sizes
• Determined by manufacturers’ specifications and based on national standards
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Sheet Sizes, Sheet Format, Title Blocks, and Borders (cont’d.)
• Zoning– System of numbers along top and bottom
margins, letters along left and right margins• Allows a drawing to be read like a road map
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Sheet Sizes, Sheet Format, Title Blocks, and Borders (cont’d.)
• Architectural drafting title blocks– Normally preprinted
• Generally placed along the right side of the sheet• Some companies place them across the bottom
• Drawing borders– Thick lines that go around entire sheet
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Sheet Sizes, Sheet Format, Title Blocks, and Borders (cont’d.)
• Information found in almost all blocks:– Drawing number– Company name, address, and phone number– Drawing name– Scale– Drawing or sheet identification– Date
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Sheet Sizes, Sheet Format, Title Blocks, and Borders (cont’d.)
• Information found in almost all blocks (cont’d.):– Drawn by– Checked by– Architect or designer– Revisions
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Sheet Sizes, Sheet Format, Title Blocks, and Borders (cont’d.)
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How to Fold Prints
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Diazo Reproduction• Also known as blue-line prints
– Historically one of the most common methods for reproducing original manual drawings
• Refer to the Student CD: DIAZO REPRODUCTION, for more information
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Photocopy Reproduction• Photographic reproduction of printed or
graphic material– Architectural drawing photocopies
• Commonly made on large-size engineering copy machines
• Prints can be made on bond paper, vellum, polyester film, colored paper, or other translucent materials
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Photocopy Reproduction (cont’d.)• Features:
– Almost any large original can be converted into a smaller-sized reproducible print
– Mixed-scale drawings can be enlarged or reduced and converted to a standard scale
– Halftone illustrations, photographs, and solid or fine line work have excellent resolution and density
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Microfilm• Film containing a reduced image of a
drawing or other printed material – Used for compact storage and future access,
viewing, and reproduction• Refer to the Student CD: MICROFILM, for more
information