; Computer-aided design's role
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# Computer-aided design's role

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```									ENGR 2160 - Engineering Graphics

Chapter 3
OSNAP

   Remember the SNAP command allows users to snap
to points.

   However the Object SNAP command allows users to
snap to entities on the drawing.
   Endpoint of a Line
   Midpoint of a Line
   Intersection of two Lines
   Center Point of a Circle
   Etc.
Exercises
   PRACTICE (From Page 78)
 SP 3-1
 SP 3-2

   CLASSWORK (From Page 110)
 EX 3-1
 EX 3-2

 EX 3-3
GRIPS
   The GRIPS function is used to quickly identify and lock
onto convenient points on entities.
 For Example: End points of a line, Center point of a
circle.
   GRIPS are helpful when using some modify
commands:
 Turning GRIPS on and off (use Command Line)
For the following select the object and right click on
the convenient points.
 Extend
 Move
 Rotate
 Mirror
BLOCKS
   BLOCKS are group of entities saved as a single unit.
   Blocks are used to same shapes and groups of
shapes that are used frequently when creating
drawings.
 The idea is to save time by inserting pre-drawn
objects in the SAME DRAWING.
 Insertion allows positioning, scaling and rotation
   BLOCK Operations
 Create Block (Use Block Toolbar)
 Insert Block (Use Block Toolbar)
 Change Scale of Block (Use Block Toolbar)
 Explode a Block (Use Explode from Modify Toolbar)
WBLOCK
   WBLOCKS are group of entities saved as a single unit
that can be used in ANY DRAWING.
 The idea is to save time by inserting pre-drawn
objects in multiple drawings.
   WBLOCK Operations
   Create Block (Type WBLOCK in Command Line)
   Insert Block (Use Block Toolbar)
   Change Scale of Block (Use Block Toolbar)
   Explode a Block (Use Explode from Modify Toolbar)
Basic Information Included in a Drawing

 Projected  Views: Show as many sides as needed for
completeness.
 Cross Sections: A view that is good for showing
interior features.
 Table: Usually placed on the lower right corner,
consists of material information, part name,
designer etc.
 Dimensions: These are the most important and
most complicated part of the drawing. There is
more to it than just the numerical values!

Source: http://engineering.dartmouth.edu/mshop/pdf/introdr.pdf
Basic Information Included in a Drawing

Source: http://engineering.dartmouth.edu/mshop/pdf/introdr.pdf
TITLE BLOCKS

SUSHIL ACHARYA
SOFTWARE ENGINEERING
ROBERT MORRIS UNIVERSITY
TITLE:

EXERCISE NO.:
SCALE:     DATE:   REV:
ATTRIBUTES
   ATTRIBUTES are sections of text added to a block that
prompt the drawer to add information to the drawing.
 For Example a title block may have an attribute that
prompts the illustrator to add the date to the title
block as it is inserted into the drawing.
   ATTRIBUTE Operations
   Add an Attribute to a Block (Use Block Toolbar)
   Create a New block that includes Attributes (Use Block
Toolbar)
   Insert an existing block with attributes (Use Block Toolbar)
   Edit and Existing Attribute (Use Block Toolbar)
Exercises
   CLASSWORK (From Page 110)
 EX 3-1, EX 3-2, EX 3-3
 EX 3-30 (Attach Title Block to your drawing)

 EX 3-35 (Attach Title Block to your drawing)

 EX 3-36 (Attach Title Block to your drawing)

   HOMEWORK (Page 117)
   EX 3-34 (Attach Title Block to your drawing)

REMEMBER ONLY Submit the Homework by lab class next week.
End of Chapter - 3

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