Mount Royal University - Department of Math, Physics, & Engineering
ENGR 1271
DRAWING
CLASS 2
JANUARY 20, 2012
Outline
1. Line styles and descriptions (construction, object, hidden, and centre lines)
2. Multiview (Orthographic) projection
3. Glass box theory
Homework (Due in class 3) – Isometric and Multiview Drawings
Draw correctly proportioned isometric and three-view multiview drawings (front, top
(or bottom), and right (or left) views) of the 3 cardboard objects assigned in class.
Choose the most descriptive view for the front views. Show all visible features of
each object in the isometric drawings using object and appropriate centre lines and
all visible and hidden features in the multiview drawings using object, hidden, and
centre lines. Use a scale of 1/2 (1 unit on the drawing = 2 units on the object). Print
the scale (SCALE 1:2) and the multiview titles (FRONT, TOP (or BOTTOM), and
RIGHT (or LEFT)) on the drawings using upper case, printed text. Include the third
angle symbol on the multiview drawings. Do not erase construction lines.
Marking Criteria for Isometric Drawings (3 drawings x 6 marks each = 18)
 Most descriptive view of the object is shown
 Proportions are correct (True sizes drawn to scale)
 Features of the object are identified and drawn correctly
(Correctness involves line type and placement, 30° inclination of horizontal
edges, parallelism of parallel edges, elliptical shapes of circular features)
Marking Criteria for Multiview Drawings (3 drawings x 10 marks each = 30)
 Most descriptive view of the object appears as the front view
 Views are laid out and oriented correctly
 Proportions are correct (True sizes drawn to scale)
 Features of the object are identified and drawn correctly
(Correctness includes line type and placement)
Marking Criteria for Notes and Text on Drawings (2 marks)
 Titles, scale, and third angle symbol are indicated correctly
/ .5
/ .5
/ 5
/ .5
/ 1
/ .5
/ 8
/ 2
Reading Review
Chapter 4, “Multiviews“, pages 348-355, Engineering Design and Communication 1,
Dym and Leake.