This document provides guidelines and examples for creating section views in technical drawings. It discusses the proper use of section lines, cutting planes, hidden lines, and different section types including full, offset, half, removed, revolved, aligned, broken-out, and webs. The key points are that section lines should indicate cut material, all edges should be shown, hidden lines are only needed for features, and section lines must be consistent in adjacent views.

1. ME 123
Full Section
Visualization and CAD Hard to
visualize.
Compare with
right side in
section for
Section Views readability
Left side view Front view Right side view
in Full Section
General Guidelines Lines in Sectioning
• Use section lines to indicate “cut” material
• Show all edges, not just “cut” material
• No hidden lines except as needed for feature
• Use object lines, not hidden lines, to outline
“cut” material
• Section lines same direction on each part
• Cutting plane line in adjacent view
• Section lines normally at 45o
(a) (b) (c) (d) (e)
CORRECT INCORRECT INCORRECT INCORRECT
Hidden Lines in Section Views Direction of Section Lines
CORRECT INCORRECT INCORRECT
Normaly the section lines are at 45 degrees,
(A) (B) but not if a feature of the part is at 45
degrees.

2. Section Hatch Section Types
Section lines at Same part, same
varying angles for angle • Full
different parts
• Offset
• Half
• Removed
• Revolved
• Aligned
• Broken-Out
Three Parts Two Parts
Full Section Offset Section
Offset
Top View
Cutting Plane
Edge View of Cutting Plane
Section
Line of Sight Removed Portion
Lines Top View
Offset Line Not Shown
Animation Front View
Front View
Return to Section Types Return to Section Types
Half Section Removed Section
B
Cutting Plane A
Section A-A
A
Remove One Quarter B
Edge View of
Cutting Plane
Center Line
(Hidden lines omitted unless
used for dimensioning
Return to Section Types Return to Section Types

3. Revolved Section Aligned Section
Top View D
Revolved 90o
D
Pictorial View
Front View
Broken Around Section in View
Section
Return to Section Types Return to Section Types Section D-D
Broken-Out Section Webs in Section
Cutting Plane
(c) CORRECT
A
Break Line
Broken-Out Portion
B B
Front View with
Broken-Out Section
(a) CORRECT (b) INCORRECT
A
Return to Section Types
Full Section Example Half Section Example

4. Offset Section Example
The holes go through