dimension lines: shows the beginning and the end of the measurement. terminated by arrowheads. thin...
TRANSCRIPT
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Dimension lines:Shows the beginning and the
end of the measurement.Terminated by arrowheads.Thin line (dark) weight.Should be broken to allow for
the numbers to be inserted.Must be a minimum of .375" or
10mm away from the object.Must be a minimum of .250" or
6mm away from parallel dimension lines.
Extension Line
Dimension Line
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Extension lines:Extend the edge of the object.Thin line (dark) weight.There should be a visible gap
(.0625" or 1mm) between the object and the start of the extension line.
Extension lines should extend about .125" or 2.5mm beyond the last dimension line.
Extension Line
Dimension Line
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Leader lines:Are drawn from a note or dimension to place
where the note applies.Are drawn at an angle (usually 30°, 45°, or 60°).Should have a short (.125" or 3mm) shoulder that if
extended, would intersect the note at mid-height.
May end with an arrowhead or dot.Leaders should not cross over or through other
leaders or dimension lines.Avoid making leaders parallel or perpendicular to
visible edges..
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Arrowheads:Can be solid filled or open.Should be approximately .125" or 3mm long.Should be approximately 2.5 to 3 times as
long as wide.
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SPACE
EXTENSION LINE
SPACE
DIMENSION LINE
LEADER
2X R.25
1.00
2.00
Ø2.00
4.00
1.00
2.00
Ø1.00 THRU .25" (6MM) MIN BETWEEN DIMENSION LINES
.38" (10MM) MIN FROM VISIBLE LINE TO DIMENSION LINE
.03 (1MM)
.12 (3MM)
DIMENSIONING INCLUDES MEASUREMENTS, NOTES AND SYMBOLS 6
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11HEX BOLT
5
7
14
21
1.25
SECTION A-A12
A 4
15
9
103
A6
7.00
8
13
1. Phantom 2. Section 3. Hidden 4. Cutting/viewing
5. Leader 6. Hidden 7. Center 8. Visible/object
9. Extension 10. Break 11. Visible/object
12. Section 13. Extension 14. Break 15. Dimension
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Procedures for using decimal and metric measurement.
Decimal inches:Decimals are the ANSI standard.Decimals are easier to add, subtract, multiply and divide than
fractions.Preferably, decimals should be rounded to two decimal places.
Omit zero before the decimal point for values of less than one.
Fractional inches:Used where close tolerances are not important.The horizontal fraction bar is preferred.
Metric:Where linear measurement are less than 10,000 millimeters, the
millimeter is the standard unit of measure.The abbreviation for millimeters (mm) is usually omitted when
all dimensions are in millimeters.The period is used as a decimal point only in English speaking
countries, others use a comma.
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The number one rule of dimensioning is that of clarity.Place dimensions where the shape is best shown.Shortest dimensions placed closest to the object.Group and align dimensions when possible.Avoid duplicate and/or unnecessary dimensions.Try to avoid placing dimensions inside a view.Avoid crowding dimensions.Avoid dimensioning to hidden features.Place dimensions between the views to which they relate.Lines should be thin and contrast noticeably with visible lines.Dimensions should be included that describe both size and
location of features.
The diameter of cylinders is dimensioned in the rectangular view. The diameter of machined holes is dimensioned in the circular view.
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Cartesian Coordinate System
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Polar Coordinate System
Polar CoordinatesPolar coordinates used when you need to draw the next points at specify angle. Polar coordinates system in AutoCAD specifies distance length at which angle. Using polar coordinate, points entered by typing @distance<angle [Enter]
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Absolute Coordinate SystemRelative CoordinatesAfter first points entered, your next points can be entered by specifying the next coordinate compare/relative from the first points. The relative coordinate started with symbol “@” tell AutoCAD it was a relative coordinates. Using relative coordinate, points entered by typing @x,y [Enter]
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Boolean Commands.Union (+ or ) – adds parts together
Subtract or Difference ( ) – removes parts or features
Intersection ( * or ) – Intersects overlapping volumes into a single feature
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Purpose of a Sketch
• Quickly & easily get an idea on paper– Design sketches
– Freehand technical sketches
– Technical illustrations
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Design Sketch
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Technical Illustration
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Sketching Lines
• Vertical lines–Top to bottom
• Long straight lines–Series of short straight lines
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Sketching Circles & Arcs
• Begin by lightly constructing a square
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Sketching Angles
• Begin with 90° angle
°
°
°
Subdivide once Subdivide twice
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Sketching
• Types of Sketches
–Single-view
–Multi-view
–Pictorials
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Single-view Sketching
• Technical purposes
• Front view–Most descriptive features
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Multi-view Sketching
• Technical sketch
–Front view
–Top view
–Side view
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Pictorial Sketches
• Quickly communicate an idea
• Three dimensions in one view
–Width
–Height
–Depth
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Pictorial Sketches
• Three (3) types
–Isometric
–Oblique
–Perspective
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Isometric Sketch
WIDTH
DEPTH
HE
IGH
T
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Isometric Sketching
• Three equally spaced axes of 120°
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Isometric Sketching
• Receding lines–Typically 30°
off horizontal
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Isometric Sketching
• Circular shapes appear as ellipses
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Isometric Ellipses
• Correct ellipse orientation
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Isometric Sketching
• Non-Isometric lines–Locate
endpoints and connect
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Oblique Sketch
WIDTH
DEPTH
HE
IGH
T
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Oblique Sketching
• Front view is drawn true shape and size
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Oblique Sketching
• Receding edges are usually drawn at an angle of 30°, 45°, or 60°
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Oblique Sketching
• Circles and curves drawn on frontal plane will appear true shape and size
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Perspective Sketches
2-Point Perspective1-Point Perspective
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Perspective Sketches
• Objects appear as the eye would see them
• Most realistic type of pictorial sketch
• Most difficult pictorial sketch to draw
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Drafting Equipment
• Drawing board/table
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Drafting Equipment
• Drawing Horizontal lines
– T-square
– Parallel edge
– Drafting Machine• Arm/elbow type• Track type
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Drafting Equipment - Triangles
• 45° Triangle– Draw vertical lines and
lines @ 45°
• 30° x 60° Triangle– Draw vertical lines and
lines @ 30° and 60°
• Adjustable Triangle– Draw lines @ 0° to 90°
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Drafting Equipment - Leads
B
9H
6B 5B 4B 3B 2B
HARDUsed where extreme accuracy is required. Softer grades (right) used for line work on engineering
drawings. Draw very light lines.
HB F H 2H 3H
SOFTVery soft leads, smudge easily. Used for art work of various kinds and full-size details in architectural drawing.
8H 7H 6H 5H 4H
MEDIUM General purpose work. Softer grades (right) used for technical sketching,
lettering, freehand work. Harder grades (left) used for line work on machine &
architectural drawings.
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Drafting Equipment - Scales
• Engineer (Civil)
• Mechanical drafter
• Metric
• Architecture
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Drafting Media Types
• Vellum– Tracing paper treated to make it more
transparent– Most commonly used drafting media
• Polyester drafting films (mylar)– Very transparent, strong, and lasting– Strongest drafting media
• Bond– Standard printing and copy paper
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Drafting Media Sizes
E – 44 X 3448 X 36
D – 34 X 2236 X 24
C – 22 X 1718 X 24
B – 17 X 1112 X 18
A – 11 X 8.5 9 X 12
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Lettering
• Practice of adding clear, concise words on a drawing to help people understand the drawing
• Notes lettered on rough sketches are functional and important to operation
• Simple freehand lettering completes the idea captured in a sketch
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Lettering Composition
• Letter and word spacing should be about uniform– Space between words should equal the
approximate width of the letter “O”
• Background area between letters should appear equal
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Lettering
• Practice of adding clear, concise words on a drawing to help people understand the drawing
• Notes lettered on rough sketches are functional and important to operation
• Simple freehand lettering completes the idea captured in a sketch
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Lettering Composition
• Letter and word spacing should be about uniform– Space between words should equal the
approximate width of the letter “O”
• Background area between letters should appear equal
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Guidelines
• Horizontal guidelines keep letters the same height
• Vertical guidelines aid the eye in keeping letters from slanting
• Guidelines are drawn very light and very thin– Do not need to be erased
• Uniform vertical space should be left between lines of letters
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Types of Lettering
• ANSI (American National Standards Institute)
– Recognizes the use of single-stroke Gothic letters
• Letters are formed using a series of strokes
– Typically all capital letters are used
• Most common lettering on Engineering Drawings– Vertical, Uppercase, Gothic
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Lettering Standards
• Typically, most letters are .125” (3mm) tall
• Fractions are typically twice as tall as numbers
• Fraction bar is horizontal and does not touch the numbers 6 1
2
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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
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Drawing Lines at Standard Angles
15°
45°
30°
75°
60°45°
60°
75°
15°
30°
HORIZONTAL 0°HORIZONTAL 0°
90°
VER
TIC
AL
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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
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Reading a Mechanical Scale
160 1 2
FRACTIONAL INCH SCALE (FULL SIZE)
116
14
18
12
1 2 316
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Reading a Mechanical Scale
FRACTIONAL INCH SCALE (HALF SIZE)
0 144 42
240
312
3871
41 2
21
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Reading a Decimal Scale
DECIMAL INCH SCALE (FULL SIZE)
50(.02) 0
2 4 6 81
2 4 6
1.50.74 1.12
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Reading a Decimal Scale
DECIMAL INCH SCALE (HALF SIZE)
HALFSIZE
0 1 2 3 4 5 6 7 8
1.70.50 5.903.20
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Reading a Metric Scale
1:1 SCALE (1mm DIVISIONS)
mm1:1
0 10 20 30 40 50 60 70 80
42246 66
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Reading a Metric Scale
HALF SCALE (2mm DIVISIONS)
mm1:2
0 20 40 60 80 100 120 140 160
282 62 110
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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)
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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
.0625"
.125"
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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"
.0625".75" - 1.5"
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Alphabet of Lines
• Dimension, Extension, Leader Lines– Thin and dark– .020” (0.5mm)– Softer lead (F or HB)
6.125”
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Multiview Drawing
• Another name for orthographic projection is multiview drawing
• Involves visualization and implementation– Ability to see clearly in the mind’s eye an
object– Process of drawing the object
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Multiview Drawing
• A system that allows you to make a two-dimensional drawing of a three-dimensional object
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Viewing Objects
• A box is formed by six mutually
perpendicular planes of projection
that are located around the object
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Viewing Objects
• Lines are formed on the planes by projecting the edges of the object onto the planes
– These images are called “views”
– There are six views formed by the planes of a box
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Viewing Objects
• Unfolding the box produces an arrangement of the six views
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Choosing Views
• Most commonly used views– Front View– Top View– Right Side View
• Most descriptive view is typically designated as the Front View
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Choosing Views
• Complex objects require three views to describe its shape
• Simple objects can be described with two views– Ex: Soda Can
• Thin objects can be described with only one view– Depth is given in a note– Ex: Erasing Shield
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HEIG
HT
WIDTH
DEPTH
Object Dimensions
• All objects have 3 dimensions–Height
• Distance from top to bottom
–Width• Distance from side
to side–Depth
• Distance from the front to back
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TOP VI EW
FRONT VI EW R. SI DEVI EW
WI DTH
HEIG
HT
DEPTH
DEPT
H
Object Dimensions
• Front View– Shows width & height
• Top View– Shows width & depth
• Side View– Shows height & depth
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TOP VI EW
FRONT VI EWR. SI DE
Drawing Views of Objects
• Depth can be projected between views by using a 45° miter line
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Line Types - Visible
• Edges that can be seen in a given view areVisible or Object lines
• Visible lines are thick and dark– .028” or .7mm– F or HB lead
FRONT VI EW
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TOP VI EW
Line Types - Hidden
• Edges that cannot be seen from a given view are indicated by Hidden lines
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Line Types - Hidden
• Drawing hidden lines– .125” (3mm) dashes– .0625” (1mm) spaces between dashes– Thin: .020” (.5mm)– Dark: F or HB lead
.125"
.0625"
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Line Types – Center
• Center lines indicate axes of symmetry
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1.63 1.25
5.13
2.00
2.88
1.751.50
2.00
3.00
Ø2.22
TOP VI EW
FRONT VI EW R. SI DE VI EW
45°
SPECI AL CAM R. MI GLI ORATO 5/ 9/ 03 SCALE 1:1 16-52 12 NBHS
Placement of Views
• Views should be visually balanced within the working space
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FRONT VI EWR. SI DEVI EW
TOP VI EW
5.13 1.50 2.00
3.00
1.50
2.00
Steps for Centering a Drawing
• Draw in views using light construction lines
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Straight Edges
3
5
2
4
1A
B
6
• Edges that are perpendicular to a plane of projection appear as a point
6
6
55
2
2
4
4
3
1
1
B
B A
A A
1 2
4
5 6
B
2 31
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Straight Edges
• Edges that are parallel to a plane of projection appear as lines
• Edges that are inclined to a plane of projection appear as foreshortened lines
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Curved Edges
• Curved edges project as straight lines on the plane to which they are perpendicular
• Curved edges project as curved lines on the planes to which they are parallel or inclined
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Inclined Surfaces
• Inclined surfaces appear as an edge in two opposite principal views, and appear foreshortened (not true size) in all other principal views.
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Oblique Surfaces
• Oblique surfaces do not appear either as an edge or true size in any principal view.
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Angles
• Acute Angle– Measures less than 90°
• Obtuse Angle– Measures more than 90°
• Right Angle– Measures exactly 90°
• Vertex– Point at which two lines of
an angle intersect
Vertex
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Circle
• Radius– Distance from the center of a circle to its
edge
• Diameter– Distance across a circle through its center
• Circumference– Distance around the edge of a circle
• Chord– Line across a circle that does not pass at
the circle’s center
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Circle
• Has 360°
• Quadrant– One fourth (quarter) of a circle– Measures 90°
• Concentric– Two or more circles of different
sizes that share the same center point
90° 90°
90° 90°
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Triangles
• Equilateral– All three sides are of equal length
and all three angles are equal
• Isosceles– Two sides are of equal length
• Scalene– Sides of three different lengths
and angles with three different values
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Triangles
• Right Triangle– One of the angles equals 90°
• Hypotenuse– The side of a right triangle that is
opposite the 90° angle
HYPOTENUSE
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Quadrilaterals
• Square– Four equal sides and all angles
equal 90°
• Rectangle– Two sides equal lengths and all
angles equal 90°
• Trapezoid– Only two sides are equal length
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Quadrilaterals
• Rhombus– All sides are equal length and
opposite angles are equal
• Rhomboid– Opposite sides are equal length
and opposite angles are equal
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Regular Polygons
• Pentagon– Five sided polygon
• Hexagon– Six sided polygon
• Octagon– Eight sided polygon
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Regular Polygons
• Distance across flats– Measurement across the
parallel sides of a polygon
• Distance across corners– Measurement across
adjacent corners of a polygon
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Solids
• Prism
– Right Rectangular
– Right Triangular
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Solids
• Pyramid
• Torus
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Geometric Terms
• Circumscribe– Process of creating a
polygon that fully encloses a circle and is tangent to all of the polygons sides
• Inscribe– Process of creating a
polygon that is fully enclosed by a circle at its corners
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Geometric Terms
• Bisect– Divide into two equal
parts
• Tangent– A line and arc, or two
arcs that touch each other at one point only
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Geometric Symbols
Angle
Triangle
Radius
Diameter
Parallel
Perpendicular
Square
Centerline
R
CL
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Terms & Definitions
• Parliamentary Procedure– A set of rules for conduct at meetings which
keeps assemblies orderly and guarantees that all people have equal opportunity to express themselves
• Item of Business– A single matter to be discussed or acted on
by an organization
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Terms & Definitions
• Minutes– The official written record of what was said
and done in a meeting
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Terms & Definitions
• Standing– A regular committee which usually serves for
a one year period to plan/carry out activities that fall w/in a certain subject matter
• Majority vote– More than half the votes cast
• Two-thirds vote– Two-thirds or more of the legal votes cast
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Terms & Definitions
• Second– An indication by a member that he or she
wants to consider the motion just proposed by another member
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Terms & Definitions
• Minority– Less than half
• Majority– More than half
• Quorum– The number of members needed to be
present to legally transact business
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Motions & their Purposes
• Main motion– To present an item of business for
consideration and action by the assembly
• Amend– To change a main motion in some way; add
to, take away from, or substitute words for
• Postpone– To defer action of a motion until a later time
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Steps for Processing aMain Motion
• Obtain the floor– Be recognized by the Chair by standing and
saying Mr. Chairman
• Chair assigns the floor– The Chair recognizes one of the members by
pointing or nodding
• Member makes the motion– States “I move that …”
• Another member seconds the motion
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Steps for Processing aMain Motion
• Chair restates the motion to the assembly
• Motions is discussed/debated by the assembly
• Vote is taken on the motion
• Vote is announced and appropriate action is taken
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Order of Business
• Opening– Call to order, emblem ceremony, pledge to flag)
• Roll Call
• Reading of Secretary’s minutes
• Treasurer’s report
• Committee reports– Standing
– Ad Hoc
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Order of Business
• Unfinished business
• New business
• Program– Speaker, film, etc
• Adjournment
• Refreshments
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Raps of the Gavel& their Purposes
• One rap–Everyone should be seated
• Two raps–The meeting is called to order
• Three raps–Everyone should stand up