Engineering Graphics ch 1,2,3, and 6

Technical Drawings serve three purposes:

visualization, communication, and documentation.

Stages of Design Process

problem identification, ideation, refinement/analysis, and implementation/documentation.

Sequential Engineering

Manufacturing activities occur in a sequential order, leading to inefficiencies in time and money.

Concurrent Engineering

Integrates design and manufacture to optimize all elements in the product life cycle, enhancing efficiency and cost-effectiveness.

Lettering Standard

Hand-drawn notes typically use 3mm (1/8 inch) lettering; legibility and acceptable styles are crucial.

Surface Types

Surfaces can be planar, single curved, double curved, or warped.

Contours

Main outlines that separate an object from surrounding space, indicating positive and negative space.

Centerlines

Show axis of symmetry, indicate paths of motion, and locate bolt-hole circles.

Hidden Lines

Dashed lines representing features that are not visible

Edges

Interaction between two surfaces.

Vertices

Intersection of three or more surfaces.

Point

Represents a location in space with no dimensions.

Important Skills for Drawings

Accuracy, speed, legibility, and neatness are essential for effective sketches and drawings.

How many principle views are there?

6

Third-Angle Projection

Views are produced as if the observer is outside looking in; commonly used in the US.

Isometric Views

Offer a visual reference for parts described in orthographic views, may not show hidden lines.

Plane Surface Orientations

Can be normal, inclined, or oblique relative to the plane of projection.

How many principle dimensions are there?

3

What are the 3 regular views

Top, front, and right-side view

Which view shows the width and depth of an object

Top view

Which view shows the height and width of an object

front view

which view shows the depth and height of an object

right side

A hole that appears as a circle in the top view is indicated in the front view with___lines

2

The two distinct classifications of graphic representations are…

Artistic and technical

Accurate CAD drawings are usually produced in which of the following design stages?

Refinement/ analysis