Engineering graphics 1504 lecture 2 orthographic sketches
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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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Engineering graphics 1504 lecture 2 orthographic sketches l.jpg
Engineering Graphics 1504Lecture 2 – Orthographic Sketches

Objectives

  • Recap of Orthographic Projections

  • Lettering and title blocks

  • In-class assignment


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Recap: Lines

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


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Visible Line Functions

“LIMITS”

“EDGES”


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Hidden Line Conventions

  • evenly spaced dashes

  • spaces  1/2 of dash length

  • dashes commonly  1/8” long


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Centerline Conventions

  • to show circle/arc center or axis of symmetry

  • long lines separated by dash and two gaps

  • dashes commonly  1/8” long


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Tangent Surfaces

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


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Producing a Multiview Sketch

  • Select Front View

  • Align View Bounding Boxes

  • Sketch Features

    • True Shapes Remain

    • Project Between Views

    • Label Vertices if Needed


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Select Front View

  • Universally Used -- Clock Face

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

  • Generates Fewest Number of Hidden Lines for Entire Drawing



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Creating the Orthographic Projection Sketch

  • Front View

  • Right Side View

  • Top View


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Align View Bounding Boxes

WIDTH

DEPTH

TOP

DEPTH

WIDTH

Miter line at 45°

HEIGHT

HEIGHT

FRONT

RIGHT


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Sketch Features – View Projection

TOP

Miter line at 45°

Note: see figure 1.29 in text

FRONT

RIGHT


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Standard Letters (ASME Y14.2M-1992)

Vertical Gothic Style – All Capitals

A Lettering Template

These suggested lettering strokes may be helpful.


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Lettering Guidelines

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

  • Draw a construction line to help you judge lettering height.

  • 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.


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Spacing & Fractions

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.


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Lettering Example

  • 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)


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Lettering Cont.

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

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


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Title Block

  • Vary in layout

  • In this course must include

    • Name

    • Title or description

    • Scale and units

    • Drawn by:

    • Date:

    • Session identifier

      (eg. Wed.)


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Class Assignment

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

  • Include a title block on the first page


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