General Sketching - Memorial University of Newfoundland

General Sketching - Memorial University of Newfoundland

Engineering Graphics 1504 Lecture 2 Orthographic Sketches Objectives Recap of Orthographic Projections Lettering and title blocks In-class assignment Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 1 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 Course: Engineering Graphics 1504

Memorial University of Newfoundland Sheet 2 Visible Line Functions LIMITS EDGES Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 3

Hidden Line Conventions evenly spaced dashes spaces 1/2 of dash length dashes commonly 1/8 long Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 4

Centerline Conventions to show circle/arc center or axis of symmetry long lines separated by dash and two gaps dashes commonly 1/8 long Course: Engineering Graphics 1504 Memorial University of Newfoundland

Sheet 5 Tangent Surfaces When a curved surface is tangent to a plane NO LINE IS SHOWN Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 6

Producing a Multiview Sketch Select Front View Align View Bounding Boxes Sketch Features True Shapes Remain Project Between Views Label Vertices if Needed Course: Engineering Graphics 1504

Memorial University of Newfoundland Sheet 7 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 Course: Engineering Graphics 1504 Memorial University of Newfoundland

Sheet 8 Glass Box Approach Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 9 Creating the Orthographic Projection Sketch

Front View Right Side View Top View Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 10 Align View Bounding Boxes DEPTH WIDTH TOP DEPTH

Miter line at 45 HEIGHT HEIGHT WIDTH FRONT Course: Engineering Graphics 1504 RIGHT Memorial University of Newfoundland Sheet 11 Sketch Features View Projection

TOP Miter line at 45 FRONT Course: Engineering Graphics 1504 RIGHT Memorial University of Newfoundland Note: see figure 1.29 in text Sheet 12 Standard Letters (ASME Y14.2M-1992) Vertical Gothic Style All Capitals

A Lettering Template These suggested lettering strokes may be helpful. Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 13 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 inline with bottom of text To be aligned with the bottom of the page (preferred) or with the right side of the page.

Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 14 Spacing & Fractions Dont 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. Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 15

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) Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 16 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 Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 17 Title Block

Vary in layout In this course must include Name Title or description Scale and units Drawn by: Date: Session identifier (eg. Wed.)

Course: Engineering Graphics 1504 Memorial University of Newfoundland Sheet 18 Class Assignment Using your workbook, complete questions 9,11,13,15 Include a title block on the first page Course: Engineering Graphics 1504 Memorial University of Newfoundland

Sheet 19

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