Class 10_1

• Section views• Practice drawing, sketching• Computer model HW due today

Questions about DP?

Engineering models!

Not easy, but you get better with practice.Essential to true engineering design.I hope you are starting to get a feel for how it is done.Don’t get discouraged, keep practicing.

Next stage: build and test prototype

The lab (CAMP 148) is open.

Advice from previous students: “Leave lots of time for testing!”

Review

• Introduction to the nature and purpose of technical drawings

Typical “projections”

•  Orthographic projection (the fundamental engineering drawing)

• Isometric projection (a pictorial view)• Oblique projection (another pictorial view)

Stages in making a sketch

• Block-out the outline with “construction lines”• Block-out the major features• Refine shapes• Darken part lines

• Tips: Use construction lines liberally, draw big (use entire page), pay attention to proportions, relax and practice.

Lines

Line types (e.g., part, hidden, center)Line values (e.g., thick, intermediate,

construction)

It is important to use the proper line type and line value in your drawings. It communicates important information and makes drawings easier to understand.

Example of lines

Section views

• Section views “cut-away” part of the object so that internal details can be revealed.

Section views

• Section view are also used to show assembly details

Section view conventions

• Cut surface is filled with a “hatch”• Part lines behind cutting plane are shown• Hidden lines behind cutting plane are

generally not shown• Section view can take the place of one

orthogonal view or can be auxiliary views

Section view types

• Many section view types. A few examples…

Review: section view conventions

• Cut surface is filled with a “hatch”• Part lines behind cutting plane are shown• Hidden lines behind cutting plane are

generally not shown• Section view can take the place of one

orthogonal view or can be auxiliary views

Drawing practice

• Freehand sketches• Draw two views of the object, one of which

is a full section view• Remember: block out the entire drawing

using construction lines, pay attention to proportions, use proper section view conventions