Using Center Lines Center lines represent axes of

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Using Center Lines Ø Center lines represent axes of symmetry. → They are important

Using Center Lines Ø Center lines represent axes of symmetry. → They are important for interpreting cylindrical shapes. Copyright © 2006 by K. Plantenberg Restricted use only

Using Center Lines Ø Center lines represent axes of symmetry. → They are also

Using Center Lines Ø Center lines represent axes of symmetry. → They are also used to indicate circle of centers, and paths of motion. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Center Lines Ø Rule 1: → Center lines should start and end with

Creating Center Lines Ø Rule 1: → Center lines should start and end with long dashes. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Center Lines Ø Rule 2: → Center lines should intersect by crossing either

Creating Center Lines Ø Rule 2: → Center lines should intersect by crossing either the long dashes or the short dashes. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Center Lines Ø Rule 3: → Center lines should extend a short distance

Creating Center Lines Ø Rule 3: → Center lines should extend a short distance beyond the object or feature. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Center Lines Ø Rule 4: → Center lines may be connected within a

Creating Center Lines Ø Rule 4: → Center lines may be connected within a single view to show that two or more features lie in the same plane. • CAUTION! Center lines should not extend through the space between views. Copyright © 2006 by K. Plantenberg Restricted use only

Using Phantom Lines Ø Phantom lines uses: → They may also be used to

Using Phantom Lines Ø Phantom lines uses: → They may also be used to indicate adjacent positions of related parts. Copyright © 2006 by K. Plantenberg Restricted use only

Using Phantom Lines Ø Phantom lines uses: → Used to indicate repeated detail. Copyright

Using Phantom Lines Ø Phantom lines uses: → Used to indicate repeated detail. Copyright © 2006 by K. Plantenberg Restricted use only

Using Phantom Lines Ø Phantom lines uses: → Used to indicate alternate positions of

Using Phantom Lines Ø Phantom lines uses: → Used to indicate alternate positions of moving parts. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Phantom Lines Ø Rule 1: → Phantom lines should start and end with

Creating Phantom Lines Ø Rule 1: → Phantom lines should start and end with a long dash. Copyright © 2006 by K. Plantenberg Restricted use only

Using Break Lines Ø Break lines are used to show imaginary breaks in an

Using Break Lines Ø Break lines are used to show imaginary breaks in an object. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Break Lines Ø There are two types of break lines. → If the

Creating Break Lines Ø There are two types of break lines. → If the distance to traverse is short the series of connecting arcs is used. Copyright © 2006 by K. Plantenberg Restricted use only

Creating Break Lines Ø There are two types of break lines. → If the

Creating Break Lines Ø There are two types of break lines. → If the distance is long the thin straight line with a jog is used. Copyright © 2006 by K. Plantenberg Restricted use only

Line Precedence Ø If two lines occur in the same place, the line that

Line Precedence Ø If two lines occur in the same place, the line that is considered to be the least important is omitted. Ø Lines in order of precedence/importance are as follows; → → Cutting plane line Visible line Hidden line Centerline Copyright © 2006 by K. Plantenberg Restricted use only