Transcript chapter 5 - Ivy Tech -

2D Drawing Representation
Chapter 5
Objectives
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Represent curved surfaces in multiview
drawings
Show intersections and tangencies of
curved and planar surfaces
Represent common types of holes
Show fillets, rounds, and runout in a 2D
drawing
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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Objectives (cont.)
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Use partial views
Apply revolution conventions when
necessary for clarity
Draw removed views and projected
views
Show right and left hand parts
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Objectives (cont.)
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Project curved surfaces by points
Show and label an enlarged detail
Show conventional breaks
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Manufactured Features
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Certain features are part of many
engineering designs
Learning their names and shapes helps
you visualize and communicate about
them
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Manufactured Features
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Fillet – a rounded interior blend
between surfaces
Round – a rounded exterior blend
between surfaces
Counterbore – a cylindrical recess
around a hole, usually to receive a bolt
head or nut
Technical Drawing 13th Edition
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Manufactured Features
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Countersink – a conical-shaped recess
around a hole, often used to receive a
tapered screw head
Spotface – a shallow recess like a
counterbore used to provide a good
bearing surface for a fastener
Boss – a short raised protrusion above
the surface of a part
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Manufactured Features
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Lug – a flat or rounded tab protruding
from a surface usually to provide a
method for attachment
Flange – a flattened collar or rim
around a cylindrical part to allow for
attachment
Chamfer – an angled surface used on
cylinders to make them easier to handle
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Manufactured Features
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Neck – a small groove cut around the
diameter of a cylinder, often where it
changes diameter
Keyway/Keyseat – a shaped depression
cut along the axis of a cylinder or hub
to receive a key, used to attach parts to
a cylinder so they won’t turn on it
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Common Manufactured Features
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Knurl – a pattern form on a surface to
provide for better gripping or more
surface area for attachment
Bushing – a hollow cylinder that is often
used as a protective sleeve or guide or
as a bearing
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Common Manufactured Features
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Conventional Representations
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Standard orthographic projections don’t
always show complex shapes as clearly
and simply as you may wish
Simplified conventional representations
that deviate from true orthographic
projection may be used to enhance
economy and clarity in a drawing
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Intersections and Tangencies
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A plane surface can intersect or be
tangent to a contoured surface
When a plane intersects a contoured
surface, a line is drawn to represent
that edge
When a plane surface is tangent to a
contoured surface, no line or a thin
phantom line is drawn
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Intersections and Tangencies
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Removed Views
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It is not always possible to show all of
the drawing views in alignment on a
sheet
When this is the case, a removed view
can be used and is indicated by:
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A viewing indicator arrow showing direction
of sight or
A viewing plane line
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Removed Views
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Intersections and Tangencies
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Where a curved surface is tangent to a
plane surface, no line is drawn
When a curved surface intersects a
plane surface, an edge is formed
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Intersections and Tangencies
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Intersections of Cylinders
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Runouts
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Small curves called runouts are used to
represent fillets that connect with plane
surfaces tangent to cylinders
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Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Conventional Edges
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Because the true projection may be
misleading, there is a conventional way
of showing rounded and filleted edges
for the sake of clarity
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Partial Views
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A view may not need to be complete in
order to clearly describe an object
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If the view is symmetrical, you can draw a
half-view on one side of the centerline
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Showing Enlarged Details
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Enlarged views
may be added
that show details
at a larger scale
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Conventional Breaks
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To shorten the view of a long object,
you can use break lines
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Alignment of Views
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Always draw views in a standard
arrangement to be sure that the
drawings are not misinterpreted
The front view should show the shape
of the object clearly
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Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Removed Views
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A removed view is a complete or partial
view removed to another place on the
sheet so it is no longer in direct
projection with any other view
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Removed views show features of an object
more clearly
Be sure to label removed views and
provide a scale if necessary
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Removed Views
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Right-hand & Left-hand Parts
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Often parts function in pairs of similar
opposite parts
The two parts are mirror images and
are not interchangeable
Ordinarily, you draw only one of two
opposite parts and label them
appropriately
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Right-hand & Left-hand Parts
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Revolution Conventions
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Regular multiview projections are
sometimes awkward, confusing, or
misleading
To prevent confusion, features may be
revolved to line up vertically and project
true length to make symmetry clear
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
30
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.
Revolution Conventions
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Hole Features
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
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© 2009 Pearson Education, Upper Saddle River, NJ 07458.
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Common Features
Technical Drawing 13th Edition
Giesecke, Mitchell, Spencer, Hill Dygdon, Novak, Lockhart
33
© 2009 Pearson Education, Upper Saddle River, NJ 07458.
All Rights Reserved.