Lecture 3

Question 1

When was the first numerical manufacturing system?

Answer 1

1957

Question 2

Pros of CAD deign.

Answer 2

The move from paper drawings to using a computer is
relatively simple
• Electronic sketches and drawings are much easier to share
• Digital 2D CAD designs are much easier to amend,
accommodating changes in the design.

Question 3

Cons of CAD design

Answer 3

• Many 2D tools are designed for creating engineering
drawings rather than concept design work
• 2D CAD drawings cannot be relied on for digital prototyping
and they cannot be used at all for rapid prototyping.

Question 4

What is a geometric constraint?

Answer 4

Non-numeric geometric relationships that the user

assigns to sketched elements

Question 5

Dimensional Constraints

Answer 5

• Distances between objects
• Sizes of arcs and circles
• Angles between objects