ET 1100 Midterm S. Jenson

Engineering Graphics Fundamentals Sean Jenson

There are ___ principal orthographic views

six

Principle views hinge about the _____ view

front

True/False: Fully unfolded views must maintain their alignment

True

What do Front, Left, and Right views have in common?

height

What do Front and Top views have in common?

width

What do Top, Right, and Left views have in common?

depth

Visible/Construction Line

___________________________________

Section/Phantom Line

______ _ _ ______ _ _ ______ _ _ ______

Hidden Line

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Centerline

_______ _ ________ _ _______ _ _______

Perpendicular projection rays project geometry onto what?

plane of projection

45° line that helps layout and check your views

miter line

True/False: An individual orthographic view shows the depths of parallel planes

false

What do oblique surfaces have the same number of in all views?

sides and corners

What does a circular hole appear as on an inclined plane?

ellipse

3rd Angle (ANSI) Projection

Top

Front R Side

1st Angle (ISO) Projection

R side Front

Top

Multiview drawings

multiple orthographic views of a single object

Multiview drawings are easier to read with the addition of what?

pictorial isometric view

Isometric axes are always how many degrees apart?

120

Starting axes in the front bottom corner of an isometric view are how many degrees?

30

The minor axis of an isometric circle aligns with the what?

center line of the hole

Degree of the tangents on isometric cylinders

30

This partial auxiliary view shows only the what?

inclined surface

Short break line

freehand wavy line

Long break line

lightning bolt style

Slices the object in half to expose the interior detail

cutting plane

Left side of scale ratio

measurement on the drawing

Right side of scale ratio

actual measurement

Civil Engineering Scales

base ten

Mechanical Engineering Scales

based on the fractional inch

Architectural Scales

based on the foot with full feet marked off to one side of the zero and 12 inches to the other

Metric Scales

millimeter marks along their edges but the numerical markings differ, range from 1:20 to 1:100