• Basic Drafting

    This class is where you will learn the basics of mechanical drafting, a skill valuable to people in many construction, engineering and manufacturing fields. .
     
    Topics covered in Basic Drafting are:

    1. Basic Drawing Tools        2. Basic Measuring and Math 

    3. Geometric Constructions         4. Orthographic Drawings    

    5. Dimensioning       6.  Sectioned Views     7.   Pictorial Drawing

     

    Thought(s) for the day:

     
    Light travels faster than sound.  This is why some people 
     
    appear bright until they speak.
     
     
    Why do we park on a driveway and drive on a parkway?
     
     
     

     
    Current Assignments 
     
     
    Geometric Constructions  (GC's)   
     
     GC #4:  Divide a Line into 7 equal parts (1st Method) pg 136; Divide a Line into 5
     
    equal parts (2nd Method) pg 136; Construct an Ellipse (Concentric Circle
     
    Method) pg 137; Construct an Ellipse (4 Center Method) pg 139; SWITCH TO
     
    MECHANICAL DRAWING BOOK!!  Construct a Circle on 3 Given Points (Figure 4-
     
    23) pg 111; Construct an Ogee Curve (Figure 4-32) pg 115.
     
     
     
     
    GC #3:  Focus is Arc Tangencies!!  Draw an arc TANGENT to two straight lines
     
    (pg 133)  Right, Obtuse, & Acute (ALL 3) using a 3/8" tangent radius;  
     
    Arc Tangent to Right Angle Pg 134; Construct an Arc Tangent to Arc and Straight
     
    Line (USE a 1/2" tangent radius) Pg 134; Draw Tangent Arcs to 2 Circles
     
    Pg 135 (USE a 3/4" tangent radius).
     
     
    GC #2:  Construct a Square (Given Side) Pg 128;   Construct a Regular Hexagon
     
    (1st Method) pg 130; Regular Hexagon (2nd Method) pg 130; Construct an
     
    Octagon using a circle pg 132; Construct an Octagon using a square pg 132;
     
    Construct a Pentagon pg 129.
     
     
     
    Drawing 2 & 3:  Your CHOICE!  Pick 2 from the following and follow the directions for each.
          Pg 92; 3-68, 3-70, 3-71 use "B" size paper.  Or 3-73 on "A" size paper. 
     
    Drawing 1:  Pg 91 "H" on B size paper. 
     
     
     
     V-BLOCK
     
    The V-Block is to be made of cast iron and
     
    machined on all surfaces.  The overall sizes are 2 ½
     
    inches high, 3 inches wide and 6 inches long.  A V-
     
    shaped cut with an included angle of 90 degrees is to
     
    be made through the entire length of the block.  The
     
    cut is to be made with the block resting on the 3” x 6”
     
    surface.  The V-cut is to begin 1/4 inch from the
     
    outside edges.  At the bottom of the V-cut, there is to
     
    be a relief slot 1/8” wide by 1/8” deep.
     
     
     
     
     
     
     
     
    Vocabulary
     
    ...is an important part of learning a technical skill. Below are terms needed for success in fields related to drafting and engineering.
     
     
     
     

    Decimal Equivalency Chart

    DecimalFraction
    DecimalFraction
    0.016  1/640.516 33/64
    0.031  1/320.531 17/32
    0.047  3/640.547 35/64
    0.063  1/160.563  9/16
    0.078  5/640.578 37/64
    0.094  3/320.594 19/32
    0.109  7/640.609 39/64
    0.125  1/80.625  5/8
    0.141  9/640.641 41/64
    0.156  5/320.656 21/32
    0.172 11/640.672 43/64
    0.188  3/160.688 11/16
    0.203 13/640.703 45/64
    0.219  7/320.719 23/32
    0.234 15/640.734 47/64
    0.25  1/40.75  3/4
    0.266 17/640.766 49/64
    0.281  9/320.781 25/32
    0.297 19/640.797 51/64
    0.313  5/160.813 13/16
    0.328 21/640.828 53/64
    0.344 11/320.844 27/32
    0.359 23/640.859 55/64
    0.375  3/80.875  7/8
    0.391 25/640.891 57/64
    0.406 13/320.906 29/32
    0.422 27/640.922 59/64
    0.438  7/160.938 15/16
    0.453 29/640.953 61/64
    0.469 15/320.969 31/32
    0.484 31/640.984 63/64
    0.5  1/211     

     

     

    TITLE BLOCK INSTRUCTIONS

    For "B" Size Paper

    1. Tape your paper down on the drafting desk horizontally parallel with a properly placed t-square.

    2. Put a ½ “ border around the entire paper.

    3. Draw another line 5/8” inside the right border.

    4. Divide the resulting smaller rectangle into three parts by centering a 4” middle section.

    5. Draw light guidelines lines every 1/8" in the title block (4 lines)


    For "A" Size Paper

    1. Tape your paper down in the drafting board horizontally parallel with a properly placed t-square.

    2. Put a 1/4“ border around the entire paper.

    3. Draw another line 5/8” above the bottom border.

    4. Divide the resulting smaller rectangle into three parts by centering a 4” middle section.

    5. Draw light guidelines lines every 1/8" in the title block (4 lines)

     

     

    TITLE BLOCK INFORMATION

     

    The information in the title block should lettered in the second and fourth lines (NOT THE BOTTOM MIDDLE OR TOP) as follows:

     

    Left block: Top; SOUTH HIGH (centered)

                       Bottom; SALINA, KANSAS (centered)

     

    Middle block: Top; ASSIGNMENT #3-65 (centered)

                            Bottom; (Left justified) SCALE: 1/4” = 1” ;   (right justified) PAGE: 255

     

    Right block: Top; DRAWN BY: Your name in INK (centered)

                          Bottom; (left justified) DATE:  8-12-14  (right justified) BLOCK: 6  

Last Modified on September 15, 2014