© Fall 2011 , ME102 – Engineering Design GraphicsDr. Jorge Luis Abanto-Bueno Lecture 5, Slide 1

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 2Dr. Jorge Luis Abanto-Bueno

Sections are used to reveal internal features that appear as hidden lines in the principal orthographic views

Why? Improve visualization

Clarify orthographic views

Facilitate dimensioning

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 3Dr. Jorge Luis Abanto-Bueno

Cutting plane

Section lines

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 4Dr. Jorge Luis Abanto-Bueno

Section lines

Cutting plane

Edge-view of cutting plane

Section lines

Sectional views do not have hidden lines except for very special cases (e.g., threaded holes or shafts)

© Fall 2011 , ME102 – Engineering Design GraphicsDr. Jorge Luis Abanto-Bueno Lecture 5, Slide 5

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 6Dr. Jorge Luis Abanto-Bueno

Flange

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 7Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 8Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 9Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 10Dr. Jorge Luis Abanto-Bueno

rib

Full Section View

Partial Principal Orthographic View

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 11Dr. Jorge Luis Abanto-Bueno

Step PulleyStep Pulley

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 12Dr. Jorge Luis Abanto-Bueno

Principal Orthographic Views Partial Orthographic View

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 13Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 14Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 15Dr. Jorge Luis Abanto-Bueno

SupportSupport

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 16Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 17Dr. Jorge Luis Abanto-Bueno

A

A

SECTION A-A

© Fall 2011 , ME102 – Engineering Design GraphicsDr. Jorge Luis Abanto-Bueno Lecture 5, Slide 18

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 19Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 20Dr. Jorge Luis Abanto-Bueno

Front View

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 21Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 22Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 23Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 24Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 25Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 26Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 27Dr. Jorge Luis Abanto-Bueno

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 28Dr. Jorge Luis Abanto-Bueno

Used to expose internal surfaces (hidden lines in principal views)

There are not hidden lines in sectional views (except for very special cases: threads)

Sectioning is used to present assemblies of parts (section lines at different angles)

In full sections the cutting plane crosses (vertically or horizontally) the entire object

Standard parts (e.g., bolts, rivets, set screws) do not require section lining even though the cutting plane passes through them

Ribs are not section lined unless you want to show their thickness

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 29Dr. Jorge Luis Abanto-Bueno

Use partial views for symmetric views

Use half sections for symmetric parts

Offset sections expose important features of the object that do not lie on an straight cutting plane

Cut formed by the intersection of the offset plane and the object is not shown (cutting plane is imaginary)

Revolved sections describe a part when its cross-section is revolved about an axis of revolution and place it on a view where the revolution occurred

Removed sections is a revolved section shown outside the view in which it was revolved

Use conventional revolutions as in the case of principal orthographic views

© Fall 2011 , ME102 – Engineering Design Graphics Lecture 5, Slide 30Dr. Jorge Luis Abanto-Bueno