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# Sheet Course: Engineering Graphics 1504 - PowerPoint PPT Presentation

Engineering Graphics 1504 Lecture 2 – Orthographic Sketches Objectives Recap of Orthographic Projections Lettering and title blocks In-class assignment Recap: Lines Strong contrast between drawing lines and construction lines Visible lines indicate all visible edges.

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Presentation Transcript
Engineering Graphics 1504Lecture 2 – Orthographic Sketches

Objectives

• Recap of Orthographic Projections

• Lettering and title blocks

• In-class assignment

Strong contrast between drawing lines and construction lines

• Visible lines indicate all visible edges.

• Hidden lines show surface, edge, or corner hidden from view

• Centerlines show holes and symmetric features

• Cutting plane used to designate where cutting plane takes place

• Extension & dimension lines used when dimensioning

• Break lines used to shorten view of a long part

• Section lines used to indicate the surface in a section view

“LIMITS”

“EDGES”

• evenly spaced dashes

• spaces  1/2 of dash length

• dashes commonly  1/8” long

• to show circle/arc center or axis of symmetry

• long lines separated by dash and two gaps

• dashes commonly  1/8” long

When a curved surface is tangent to a plane NO LINE IS SHOWN

• Select Front View

• Align View Bounding Boxes

• Sketch Features

• True Shapes Remain

• Project Between Views

• Label Vertices if Needed

• Universally Used -- Clock Face

• Shows Most Characteristic Shape -- the “U” shape of a horse shoe.

• Generates Fewest Number of Hidden Lines for Entire Drawing

• Front View

• Right Side View

• Top View

WIDTH

DEPTH

TOP

DEPTH

WIDTH

Miter line at 45°

HEIGHT

HEIGHT

FRONT

RIGHT

TOP

Miter line at 45°

Note: see figure 1.29 in text

FRONT

RIGHT

Vertical Gothic Style – All Capitals

A Lettering Template

These suggested lettering strokes may be helpful.

• Letter size should be at least 3mm high for clarity and reproducibility

• Decimal points must be clearly visible, solid, and in-line with bottom of text

• To be aligned with the bottom of the page (preferred) or with the right side of the page.

Don’t use equal spacing between letters

Instead, try to balance the area between letters.

The space between words should be equal to letter height.

The space between lines of text should be at least half the height of a letter and at most equal to the letter height.

• Extremely light horizontal lines regulate letter height

• Guidelines are not removed

• Vertical lines may be used to keep letters vertical (not used to space the letters)

• Note: strict adherence to these guidelines is not necessary, but …

• Make sure that all letters are in upper case, and construction lines are visible

• Vary in layout

• In this course must include

• Name

• Title or description

• Scale and units

• Drawn by:

• Date:

• Session identifier

(eg. Wed.)

• Using your workbook, complete questions 9,11,13,15

• Include a title block on the first page