drawing

Engineering Drawing : Engineering Drawing Taken from “Introduction to Engineering”, by Paul Wright

Line Conventions : Line Conventions Visible Lines – solid thick lines that represent visible edges or contours Hidden Lines – short evenly spaced dashes that depict hidden features Section Lines – solid thin lines that indicate cut surfaces Center Lines – alternating long and short dashes Dimensioning Dimension Lines - solid thin lines showing dimension extent/direction Extension Lines - solid thin lines showing point or line to which dimension applies Leaders – direct notes, dimensions, symbols, part numbers, etc. to features on drawing Cutting-Plane and Viewing-Plane Lines – indicate location of cutting planes for sectional views and the viewing position for removed partial views Break Lines – indicate only portion of object is drawn. May be random “squiggled” line or thin dashes joined by zigzags. Phantom Lines – long thin dashes separated by pairs of short dashes indicate alternate positions of moving parts, adjacent position of related parts and repeated detail Chain Line – Lines or surfaces with special requirements

Slide 3 : Source: http://www.genium.com/pdf/dmpc.pdf 1 2 3 4 5 6 7 8 9 10 14 13 12 11 Viewing-plane line Extension line Dimension Line Center Line Hidden Line Break Line Cutting-plane Line Visible Line Center Line (of motion) Leader VIEW B-B SECTION A-A Section Line Phantom Line

Lettering : Lettering Plain Gothic Italics are OK ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz

Sketching : Sketching Drawings made without mechanical drawing tools Free-Hand Ruler Simple drawing program Should follow standards and conventions From Course Text

Pictorial : Pictorial 3-dimensional representations One-point one vanishing point lines that are not vertical or horizontal converge to single point in distance Two-point or Three-point two or three vanishing points With two points, vertical or horizontal lines parallel, but not both With three-point, no lines are parallel Isometric Drawing shows corner of object, but parallel lines on object are parallel in drawing Shows three dimensions, but no vanishing point(s) Source: “Introduction to Engineering”, by Paul Wright

Slide 7 : Source: “Introduction to Engineering”, by Paul Wright One-point Two-Point

Slide 8 : Isometric From Course Text

Orthographic / Multiview : Orthographic / Multiview Draw object from two / three perpendicular views From Course Text / Orthographic What it looks like pictorially

Slide 10 : Top view Front View

Section Views : Section Views If three views are not enough, draw sections needed to completely describe the object.

Auxiliary Views : Auxiliary Views Used to show true dimensions of an inclined plane. Source: “Introduction to Engineering”, by Paul Wright

Slide 13 : Source: http://www.cleapss.org.uk/ Electrical Circuit Symbols For good websites with more symbols, type “Schematic Symbols” into a web search engine.

Slide 14 : Chemical Process Block Diagram From Course Text Online module on block diagrams