Chapter 09 Section

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Chapter 8 Section Views

TOPICS:

TOPICS Introduction Terminology & common practices Kind of sections Dimensioning

Introduction:

Introduction

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Object GRAPHICS COMMUNICATION WITH ENGINEERING DRAWING Working drawing Clear ? Orthographic projection ( convention ) Section views convention Section Views Orthographic Projection Finish Yes No Dimensioning

PURPOSES OF SECTION VIEWS :

PURPOSES OF SECTION VIEWS Clarify the views by Facilitate the dimensioning. reducing or eliminating the hidden lines. revealing the cross sectional ’ s shape. Let See the example

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EXAMPLE : Advantage of using a section view.

Terminology and common practices:

Terminology and common practices

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Cutting plane CUTTING PLANE Cutting plane line Cutting plane is a plane that imaginarily cuts the object to reveal the internal features. Section lines

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Cutting plane line is an edge view of the cutting plane. CUTTING PLANE LINE Indicate the path of cutting plane.

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ANSI standard Thick line Thick line JIS & ISO standard Thin line CUTTING PLANE LINESTYLES Viewing direction Viewing direction Viewing direction This course

SECTION LINING:

SECTION LINING Section lines or cross-hatch lines are used to indicate the surfaces that are cut by the cutting plane. Section lines Drawn with 4H pencil.

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SECTION LINES SYMBOLS The section lines are different for each of material ’ s type. Cast iron, Malleable iron Steel Concrete Sand Wood For practical purpose, the cast iron symbol is used most often for any materials.

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SECTION LINING PRACTICE The spaces between lines may vary from 1.5 mm for small sections to 3 mm for large sections. COMMON MISTAKE

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SECTION LINING PRACTICE It should not be drawn parallel or perpendicular to contour of the view. COMMON MISTAKE

Kinds of Sections:

Kinds of Sections

KIND OF SECTIONS:

KIND OF SECTIONS 1. Full section 2. Offset section 3. Half section 4. Broken-out section 5. Revolved section (aligned section) 6. Removed section (detailed section)

FULL SECTION VIEW:

FULL SECTION VIEW The view is made by passing the straight cutting plane completely through the part.

OFFSET SECTION VIEW:

OFFSET SECTION VIEW The view is made by passing the bended cutting plane completely through the part. Do not show the edge views of the cutting plane.

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TREATMENT OF HIDDEN LINES Hidden lines are normally omitted from section views.

HALF SECTION VIEW:

HALF SECTION VIEW The view is made by passing the cutting plane halfway through an object and remove a quarter of it.

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HALF SECTION VIEW A center line is used to separate the sectioned half from the unsectioned half of the view. Hidden line is omitted in unsection half of the view.

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The view is made by passing the cutting plane normal to the viewing direction and removing the portion of an object in front of it. BROKEN-OUT SECTION VIEW

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A break line is used to separate the sectioned portion from the unsectioned portion of the view. BROKEN-OUT SECTION VIEW There is no cutting plane line. Break line is a thin continuous line ( 4H ) and is drawn freehand.

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EXAMPLE : Comparison among several section techniques

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Revolved sections show cross-sectional features of a part. No need for additional orthographic views. This section is especially helpful when a cross-section varies. REVOLVED SECTION VIEW

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REVOLVED SECTION VIEW Basic concept

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REVOLVED SECTION VIEW Basic concept

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Given Step 1 a. Assign position of cutting plane. b. Draw axis of rotation in front view. Steps in construction REVOLVED SECTION VIEW Edge view of cross-section

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Steps in construction Given a. Transfer the depth dimension to the front view. REVOLVED SECTION VIEW Step 2

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Steps in construction Given REVOLVED SECTION VIEW a. Draw the revolved section. Step 3 b. Add section lines.

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Steps in construction Given REVOLVED SECTION VIEW FINAL PICTURE

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Placement of revolved section 1. Superimposed to orthographic view. Superimposed Break 2. Break from orthographic view. REVOLVED SECTION VIEW

6. Removed section:

6. Removed section Removed section is revolved section. Used where space does not enough for revolved section Can be located elsewhere on a drawing with properly labeled REMOVED SECTION VIEW Section view is shown outside the view.

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Example : Revolved vs. removed sections. Revolved section Removed section REMOVED SECTION VIEW

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Example : Situation that removed section is preferred. REMOVED SECTION VIEW Preferred Poor Too messy !!

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Example : Multiple removed section views REMOVED SECTION VIEW A A B B SECTION A – A SECTION B – B

Dimensioning in Section View:

Dimensioning in Section View

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In most cases, dimensioning of the section views follows the typical rules of dimensioning. GOOD POOR

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GOOD POOR f 50 10 f 50 10 DIMENSIONING

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For a half-section view, use dimension line with only one arrowhead that points to the position inside the sectioned portion. f 50 DIMENSIONING

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