ieng 248 d. h. jensen 5/1/2015engineering graphics & 3-d modeling1 lecture 05 sectional views
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IENG 248
D. H. Jensen04/18/23 Engineering Graphics & 3-D Modeling 1
Lecture 05
Sectional Views
IENG 248
D. H. Jensen04/18/23 Engineering Graphics & 3-D Modeling 2
New Assignment: HW 05
MGC: Reading
Finish CH6
HW 05:Sketch section for 6.4 - j only on p. 244.Sketch the necessary views for 6.5, p. 245 (no
dimensions necessary) Sketch the necessary views for 6.19, p. 247 (no
dimensions necessary); include the (1) broken-out and both (2) revolved sections
Lab: Start Solidworks Tutorial: Lesson 1We will complete Lessons 1 – 3 next week
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Lab & Homework Grading
Each print / sketch / set of questions is graded on a 10 point basis 10 points – Near perfect 9 points – Better than average 8 points – Average 7 points – Needs much improvement 6 points – Great improvement required,
credible attempt 2 points – Something submitted
Additional penalties for late/incomplete work
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Sectional views show hidden detail clearly- a very important method!
Cutting planes are depicted in an adjacent view as lines with perpendicular arrows showing the viewing direction for the section
Cutting plane lines are patterned, thick, dark:
A A
Sectional Views
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Types of Sections
Full Sections fully cut with a single plane
Half Sections cut to a center line with a single plane
Broken-out Sections cut to a break line with a single plane
Revolved Sections cut with a single plane, revolved in place
Removed Sections cut with a single plane, removed from position
Offset Sections (usually prismatic parts) cut using multiple, offset planes
Aligned Sections (usually rotational parts) cutting plane is bent to pass through other features
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Creating a Section View (Offset Section)
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Partial Section Views
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Revolved Sections
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Keys in Drawing Sections
Visible lines behind the cutting plane are shown
Hidden lines are not typically shown
Sectioned areas are cross-hatched and always bounded by visible lines, only
Within an individual part, all cross-hatch lines are parallel
Cross-hatch lines in adjacent parts run oblique (often perpendicular) to cross-hatch lines in other parts
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Cross-hatch Patterns
Differing materials may be shown with distinct cross-hatch patterns (Fig. 6.18 on p. 228)
Cross-hatch lines should be: thin dark evenly spaced complete* to, but not over, the visible lines
Draw at 45o unless nearly parallel to an edge
* can use outline hatching for large areas
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Std Material Cross-hatch Patterns
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Odd Details
Ribs (webs) and projecting lugs are not cross-hatched
Rotated / angled features that are off-plane with the cutting plane are shown sectioned as if they were aligned with the cutting plane (Fig. 2.26, p.231)
Some intersections (particularly small holes) are not shown as truly projected
(Fig. 6.42, p. 238)
Isometric/Oblique cross-hatches are 60o, typically.
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Showing Ribs in Section Views
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Conventional Break Lines
Short break lines are thick, dark, solid, rough Round Solid
drawn as a gap and an ‘s-break’ on each end
Round Tube unsectioned - hollow s-break sectioned - similar to regular sectioning,
with a regular, rough break line
Rectangular Metal - use a regular, rough break line Wood - exaggerate break line to look
sharp, jagged, splintered
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