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Basic Drafting Skills

VIEWS: 4 PAGES: 27

									Career &
Technical




            Basic Drafting Skills


                       003.03
        Demonstrate correct drawing procedures
Aligning & Taping Paper
 Align paper on parallel edge (or T-square)
 Fasten top two corners with strips of drafting
  tape
 Lower parallel edge (or T-square) and fasten
  bottom two corners with strips of drafting tape
Drawing Lines
 Use parallel edge (or T-square) to draw
  horizontal lines
      Lean pencil at about 60°
 Use triangles to draw vertical and inclined lines
Drawing Lines at Standard Angles




                90° VERTICAL




HORIZONTAL 0°                  HORIZONTAL 0°
Drawing Parallel Lines
 Move parallel edge (or T-square) and triangle
  to line up with given line AB
 With parallel edge (or T-square) held firmly in
  place, slide triangle into position and draw
  required line
Drawing Perpendicular Lines
 Move parallel edge (or T-square) and triangle
  until a side of the triangle lines up with the
  given line AB
 With parallel edge (or T-square) held firmly in
  place, reposition triangle across line and draw
  required line
Drawing the Border
                               11.00
  .38                  10.25                              .38


                                                                .50




        Recommended layout for
        A size sheet


                                                                       8.50


                                                                7.63




                                       TITLE BLOCK AREA




                                                                .38
Drawing the Title Block
 Title block contains information such as drafter, date,
  and scale
      Dimensions shown are recommended and may be varied to
       accommodate the user’s requirements

                                                  3.88
                                                         2.38           .38

                                               COMPANY NAME
                                                AND ADDRESS
        INFORMATION RELATED
        TO PREPARATION OF   TITLE
        DRAWING INCLUDES
        NAME OF DRAFTER,                                                                    2.00
        ENGINEER, CHECKER,
        ISSUE DATE, ETC.                                                                  1.38
                            SIZE CAGE CODE   DWG NO.                    REV
                                                                                    .63
                            SCALE                        SHEET                .25
                                                                 1.75
                                                        3.25
                                                 4.25
                                     6.25
Centering a Single View Drawing

        1.75   1.75          1.75   1.75




                                           1.50


                      3.00




                                             5.50




                             8.75
 Centering a Single View Drawing
Step 1


                  2.75




           4.38          4.38




                  2.75
 Centering a Single View Drawing
Step 2
                1.75   1.75   1.75   1.75




         1.50



                                            3.00
 Centering a Single View Drawing
Step 3
 Centering a Single View Drawing
Step 4
Scale Drawings
 Measurements can be full size or in
  some exact proportion to full size
 Triangular scales are typically used to
  allow for more scales per stick
 Scales are noted on drawings as
   Drawn units = actual units
   Drawn units : actual units
Reading a Mechanical Scale


          1 1 11
               1   2   3
          4 2168       16


 16
      0            1        2




 FRACTIONAL INCH SCALE (FULL SIZE)
Reading a Mechanical Scale


             11    21 37
              4     2 8


  1           44           42       40
  2                             2        3
         0           1




 FRACTIONAL INCH SCALE (HALF SIZE)
Reading a Decimal Scale


              .74   1.12   1.50



 50       2    4      6      8        2   4   6
(.02) 0                           1




      DECIMAL INCH SCALE (FULL SIZE)
Reading a Decimal Scale


       .50 1.70 3.20       5.90


HALF
SIZE
       0     1         2    3     4   5   6   7   8




       DECIMAL INCH SCALE (HALF SIZE)
Reading a Metric Scale


           6    24   42    66

 mm
 1:1
       0       10    20   30    40   50   60   70   80




               1:1 SCALE (1mm DIVISIONS)
Reading a Metric Scale


           28
            2        62        110


 mm
 1:2
       0        20        40     60   80   100   120   140   160




           HALF SCALE (2mm DIVISIONS)
Measuring Angles w/ a Protractor
 Angles are measured in units called degrees
 A circle is divided into 360 parts (360°)
      Each part is 1°
 An angle of 43° is measured with a protractor



         43°
Alphabet of Lines
 Construction lines
      Thin and light
      .020” (0.5mm)
      Hard lead (4H)

 Visible lines
      Thick and dark
      .028” (0.7mm)
      Softer lead (F or HB)
Alphabet of Lines
 Hidden lines
     Thin and dark
     .020” (0.5mm)
     Softer lead (F or HB)
     .125” (3mm) long dashes w/ .030”
      (1mm) spaces in between

                  .125"


                               .0625"
Alphabet of Lines
 Center Lines
     Thin and dark
     .020” (3mm)
     Softer lead (F or HB)
     .125” (0.5mm) dash in center w/ .030”
      (0.1mm) spaces between longer lines

                         .125"


           .75" - 1.5"           .0625"
Alphabet of Lines
 Dimension, Extension, Leader Lines
     Thin and dark
     .020” (0.5mm)
     Softer lead (F or HB)



                       6.125”
Alphabet of Lines

                                    Thickness
                        Thick             Thin
                        (.028”/.07mm)     (.020”/.05mm)
                                          Hidden Lines
                                           Center Lines
            Dark
                        Visible Lines    Dimension Lines
            (F or HB)
                                         Extension Lines
 Darkness                                 Leader Lines

            Light                       Construction Lines
            (F or HB)                      Guidelines
Single View Drawing Assignment
 On a clean sheet of paper, construct a border
  by the given handout.
 Then construct figure 4-36 on pg 129. You
  will have to center this yourself in the given
  space inside the border you have drawn.

								
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