Chapter 5 2D Drawings

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Chapter 52D Drawings
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Common Manufactured Features

• Certain features are part of many engineering
  designs
• Learning their names and shapes helps you
  visualize and communicate about them

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Common Manufactured Features
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Common Manufactured Features
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Common Manufactured Features

• Fillet a rounded interior blend between
  surfaces
• Round a rounded exterior blend between surfaces
• Chamfer an angled surface used on parts to make
  them easier to handle
• Boss a short raised protrusion above the
  surface of a part

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Common Manufactured Features

• Counterbore a cylindrical recess around a hole,
  usually to receive a bolt head or nut
• 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

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Common Manufactured Features

• 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

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Common Manufactured Features

• 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 wont
  turn on it

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Common Manufactured Features

• 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

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Common Manufactured Features
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Common Manufactured Features
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Common Features
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Common Features
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Conventional Representations

• Standard orthographic projections dont 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

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Intersections and Tangencies

• 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

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Intersections and Tangencies
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Intersections and Tangencies
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Intersections and Tangencies
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Fillets and Rounds

• A rounded interior corner is called a fillet.
• A rounded exterior corner is called a round.
• SolidWorks uses the name fillet for both rounds
  and fillets.
• Sharp corners are usually avoided because they
  are difficult to produce and can weaken the part
  by causing stress concentrations.

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Conventional Edges

• Because the true projection may be misleading,
  there is a conventional way of showing rounded
  and filleted edges for the sake of clarity

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Tangent Edges
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SolidWorks In a drawing right click on the
part. Select Tangent Edge Select Option
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More Conventional Edges
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Necessary Views

• When drawing an orthographic projection you must
  include the appropriate number of views to fully
  describe the true shape of the part.
• You may use a fewer number of views if you can
  fully describe the part in the given views.

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One View Drawing
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Two View Drawing
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Three View Drawing
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Partial Views

• A view may not need to be complete in order to
  clearly describe an object
• If the view is symmetrical, you can draw a
  half-view on one side of the centerline

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Showing Enlarged Details

• Enlarged views may be added that show details at
  a larger scale

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Conventional Breaks

• To shorten the view of a long object, you can use
  break lines

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Removed Views

• 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
• Removed views show features of an object more
  clearly
• Be sure to label removed views and provide a
  scale if necessary

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Removed Views
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Right-hand Left-hand Parts

• 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

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Right-hand Left-hand Parts
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Revolution Conventions

• 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

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Revolution Conventions
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Revolution Conventions
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Revolution Conventions
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Common Hole Features

• Common Hole Features are defined in drawings
  using a standard notation in hole callouts.
• Countersink w
• Counterbore - v
• Spotface - v
• Depth - x

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Hole Callouts
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Hole Callouts