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2. Basic Geometric Elements - Points
„ A point: Represents a location in space or on a drawing
and has no width, height, or depth.
„ A point is represented by the intersection of 2-lines, a
short crossbar on a line, or by a small cross.
3. Basic Geometric Elements - Lines
A line is defined by Euclid as “ That
which has length without breadth" A
straight line is the shortest distance
between two points and is commonly
referred to simply as a “line”
„ If the line is indefinite in extent, the
length is a matter of convenience, and
the end points are not fixed „ If the
end points are significant, they must be
marked by means of small mechanically
drawn crossbars. „ Horizontal lines
have constant distance from the lower
edge of the drawing sheet, vertical lines
have constant distance from the right
side and left side edges of the sheet.
4. Basic Geometric Elements - Lines
„ Straight lines or curved lines are
parallel if the shortest distance
between them remains
constant. The symbol means
parallel lines.
-perpendicular lines might be
marked with a box to indicate
perpendicularity, the symbol ⊥
means perpendicular lines.
The symbols and ⊥ and might
be used on sketches, but not on
production drawings.
„ Other common forms of
lines are arcs and free
curves.
5. Basic Geometric Elements - Angles
„ An angle is formed by two
intersecting lines. The
symbol ,, < means an angle.
„ There are 360º in a full circle.
„ A degree is divided into 60
minutes, 60'. A minute is
divided into 60 seconds, 60".
„7º 30' 17" is read 27 degrees, 30
minutes and 17 seconds
„ When minutes are alone
indicated the number of
minutes should be preceded by
0º. e.g., 0º 30'.
6. Basic Geometric Elements - Angles
„ 2-Angles are
Complementary if
they total 90º.
„ 2-Angles are
Supplementary if
they total 180º.
7. Geometric Construction - Triangles
„ A triangle is a plane
figure bounded by
three straight sides.
„ The sum of the
interior angles is
always
„ Any triangle
inscribed in a
semicircle is a right
triangle if the
hypotenuse
coincides with the
diameter.
8. Geometric Construction - Quadrilaterals
„ A quadrilateral is a plane figure bounded by 4-straight sides. „ If the
opposite sides are parallel, the quadrilateral is also called parallelogram
9. Geometric Construction - Polygons
„ A polygon is any plane figure bounded by straight
lines. „ Regular Polygons have equal sides and angles
„ Regular Polygons can be inscribed in or circumscribed around a circle.
10. Geometric Construction - Circles & Arcs
„ A circle is a closed curve with all points at the same distance from a point
called the center
Circumference is referred to the circle or to the distance around the
circle. Circumference = Diameter x π
11. Geometric Construction - Polyhedra
„ A polyhedron is a solids bounded that is bounded by plane surfaces.
These surfaces are called faces
„ A regular Polyhedron is a solid with faces equal a regular polygon
12. Geometric Construction - Polyhedra - Prisms
„ A prism is a polyhedron with two parallel equal polygon bases, three or
more lateral faces, which are parallelograms.
„ If the bases are parallelograms, then the prism is called parallelepiped „ If
one end is cut off to form an end and not parallel to the bases, the prism is said
to be truncated
13. Geometric Construction - Polyhedra - Pyramids
„ A pyramid is a polyhedron with a polygon for a base and triangular lateral
faces intersecting at a common point called the vertex.
„ If a portion near the vertex has been cut off, the pyramid is truncated, or it
is referred to as a frustum
14. Geometric Construction - Cylinders
„ A cylinder is a solid generated by a straight line, called the generatrix, moving
in contact with a curved line and always remaining parallel to its original position
or to the axis.
„ Each position of the generatrix is called element
15. Geometric Construction - Cones
„ A cone is a solid that is generated by a straight line moving in contact with
a curved line and passing through a fixed point, the vertex of the cone.
„ Each position of the generatrix is called element
16. Geometric Construction - Spheres
„ A sphere is a solid that is generated by a circle revolving about one of its
diameters. The diameter becomes the axis of the sphere. The ends of the
axis are poles.
17. Bisecting a line or a circular arc
„ From A & B draw equal
arcs with radius greater
than half AB
„ Join the intersections D
& E with a straight line to
locate the midpoint.
18. Bisecting a line with a triangle & T-Square
„ From endpoints A & B, draw construction lines at 30, 45, or 60 degrees
with the given line.
„ Then through their intersection, C, draw a line perpendicular to the given
line to locate the center C
19. Bisecting an angle
„ Angle BAC is to be
bisected „ Strike large arc R
„ From intersection points C &
B, strike equal arcs r with
radius slightly larger than half
BC, to intersect at D
„ Draw line AD, which bisect
the angle
20. Transferring an angle
„ Angle BAC is to be transferred to the new position A' B' „ Use
any convenient radius R, and strike arcs from centers A and A'
„ Strike equal arcs r, and draw side A' C'
26. Drawing a line through a point and perpendicular to a line
When the point P is not on the line AB
Method (a)
„ Draw from P any convenient inclined line as
PD. „ Find the midpoint C of line PD.
„ Draw arc with radius CP. The line EP is
the required perpendicular.
Method (b)
„ With P as center, strike an arc to intersect AB
at C and D.
„ With C and D as centers, and with a
radius slightly greater than half CD, strike
arcs to intersect at E. The line PE is the
required perpendicular.
27. Drawing a line through a point and perpendicular to a line
When the point P is on the line AB
Method (a)
„ With P as center and any radius, strike arcs to
intersect AB at D and G.
„ With D and G as centers, and radius slightly greater
than half DG, strike equal arcs to intersect at F.
The line PF is the required perpendicular.
Method (b)
„ Select any convenient unit of length, for example 5
mm. „ With P as center, and 3 units as radius, strike an
arc to intersect the given line at C.
„ With P as center, and 4 units as radius, strike arc DE
„ With C as center, and 5 units as radius, strike an arc
to intersect DE at F. The line PF is the required
perpendicular.
28. Drawing a line through a point and perpendicular to a line
Whether P is on or off line AB
Method (c)
Preferred Method
„ Move the triangle and T-
square as a until one leg of the
triangle lines up with AB.
„ Slide the triangle on the T-
square until its other leg passes
the through the point P, and
draw the required
perpindicular.
29. Drawing a triangle with sides given
„ Draw one side, as C, in desired position, and strike arc
with radius equal to side A.
„ Strike arc with radius equal to side B.
„ Draw side A and B from intersection of arcs, as shown in III.
30. Drawing a right triangle with hypotenuse and one side given
„ Given sides S and R, with AB as a
diameter equal to S, draw a
semicircle.
„ With A as a center and R as a
radius, draw an arc intersecting
the semicircle at C.
„ Draw AC and CB to complete
the right triangle
31. Drawing a right triangle with hypotenuse and one side given
„ Many angles can be laid out directly with the triangles
or with the protractor
„ Tangent method relies on tangent tables.
„ Sine method and chord method rely on sine
tables.
32. Laying out an angle
„ Many angles can be laid out directly with the triangles
or with the protractor
„ Tangent method relies on tangent tables.
„ Sine method and chord method rely on sine
tables.
37. Drawing a circle tangent to a line at a given point
„ At P, erect a perpendicular to the line
„ Set off the radius of the required circle on the
perpendicular „ Draw a circle with radius CP
38. Drawing tangents to two circles
„ Move the triangle and T-square as a
unit until one side of the triangle is
tangent, by inspection, to the two
circles.
„ Then slide the triangle until the other
side passes through the center of one
circle, and lightly mark the point of
tangency.
„ Then slide the triangle until the slide
passes through the center of the other
circle, and mark the point of tangency.
„ Finally, slide the triangle back to the
tangent position, and draw the tangent
lines between the two points of
tangency. Draw the second tangent line
in a similar manner
39. Drawing an arc tangent to a line or arc and through a point
44. Drawing an arc tangent to two arcs enclosing one or both
45. Conic Sections
„ A cone is generated by a straight line moving in contact with a
curved line and passing through a fixed point, the vertex of the
cone. This line is called the generatrix.
„ Each position of the generatrix is called element
„ The axis is the center line from the center of the base to the vertex
46. Conic Sections
„ Conic sections are curves produced by planes intersecting a right circular
cone. 4-types of curves are produced: circle, ellipse, parabola, and
hyperbola.
„ A circle is generated by a plane perpendicular to the axis of the cone.
„ A parabola is generated by a plane parallel to the elements of the cone. „
An ellipse is generated by planes between those perpendicular to the axis of
the cone and those parallel to the element of the cone.
„ A hyperbola is generated by a planes between those parallel to the
element of the cone and those parallel to the axis of the cone.
47. Drawing an ellipse by the pin and string method.
„ An ellipse can be generated by a point
moving such that the sum of its distances from
two points (the foci) is constant. This property
is the basis of the pin and string method for
generating the ellipse. „ An ellipse may be
constructed by placing a looped string around
the foci points and around one of the minor
axis end points, and moving the pencil along
its maximum orbit while the string is kept taut.
The long axis is called the major axis & the
short axis is called the minor axis. „ The
length of the major axis is equal to the
constant distance from the foci of the ellipse.
48. Finding the Foci points of an ellipse
„ The foci points are found by striking arcs with radius equal to half the
major axis & with center at the end of the minor axis (point C or D)
49. Drawing an ellipse by the four-center method
„ Given major and minor axes, AB and CD, draw line AD connecting the end points
as shown.
„ Mark off DE equal to the difference between the axes AO - DO.
„ Draw perpendicular bisector to AE, and extend it to intersect the major axis at K
and the minor axis extended at H.
„ Mark off OM equal to OK, and OL equal to OH. The points H, K, L and M are the
centers of the required arcs.
„sing the centers, draw arcs as shown. The four circular arcs thus drawn meet in common
points of tangency P at the ends of their radii in their lines of centers.
50. Drawing an ellipse by the concentric circles method.
„ If a circle is viewed at an angle, it will appear as an ellipse. This is the basis
for the concentric circles method for drawing an ellipse.
„ Draw two circles with the major and minor axes as diameters. „ Draw
any diagonal XX to the large circle through the center O, and find its
intersections HH with the small circle.
„ From the point X, draw line XZ parallel to the minor axis, and from the point H,
draw the line HE, parallel to the major axis. Point E is a point on the ellipse.
„ Repeat for another diagonal line XX to obtain a smooth and symmetrical
ellipse.
51. Drawing an ellipse by the trammel method.
„long the straight edge of a strip of
paper or cardboard, locate the points O,
C, and A so that the distance OA is equal
to one-half the length of the major axis,
and the distance OC is equal to one-half
the length of the minor axis.
„lace the marked edge across the axes so
that point A is on the minor axis and
point C is on the major axis. Point O will
fall on the circumference of the ellipse.
„ove the strip, keeping A on the minor
axis and C on the major axis, and mark
at least five other positions of O on the
ellipse in each quadrant.
„sing a French curve, complete the
ellipse by drawing a smooth curve
through the points.
52. Parabolas
„ A parabola may be
generated by a point
moving so that its
distance from a fixed
point is equal to its
distance from a
straight line. The
point is called the
focus, and the straight
line is called the
directrix.
53. Drawing a parabola by the pencil and string method
„ Given a focus F and a
directrix AB, fasten the
string at F and C as shown.
Its length is GC.
„ Draw the parabola by
sliding the T square to move
through different points P,
keeping the string taut and
the pencil against the T
square as shown.
„ Point C is selected at
random, its distance from G
depends on the desired
extent of the curve.
54. Drawing a parabola by the parallels to directrix method
„ The parallel directrix method is based on
the fact that for each point on a parabola,
the distance from the focus is equal to the
distance from the directrix.
„ Given a focus F and a directrix AB,
draw line DE parallel to the directrix at
any distance CZ from it.
„ With center at F and radius CZ, strike arcs
to intersect the line DE in the points Q and R,
which are points on the parabola.
„ Determine as many additional points as
are necessary to draw the parabola accurately,
by drawing additional lines parallel to the
directrix and proceeding in the same manner.
55. Drawing a parabola by the distance squared method
„ This method is based on the fact that the
parabola may be described by the
equation y=ax2.
„ Given the rise AB, and span AD of the
parabola, bisect AB at O and divide AO
into a number of equal parts.
„ Divide AD into a number of equal parts
amounting to the square of the number of
divisions of AO.
„ From line AB, each point on the parabola
is offset by a number of units equal to the
square of the number of units from point O.
For example, point 3 projects 9 units.
„ This method is generally used to draw
parabolic arcs.
56. To locate the focus of a given parabola
„ Given points P, R and V on a parabola,
to find the focus, draw tangent at P and
locate A, making a = b.
„ Draw perpendicular bisector of AP,
which intersects the axis at F, the focus
of the parabola.
57. Joining two points by a parabolic curve.
„ Let X and Y be the given points. Assume any point O, and draw tangents
XO and YO.
„ Divide XO and YO into the same number of equal parts, number the
division points as shown, and connect the corresponding points.
„ These lines are tangents of the required parabola, and form its envelope.
Use to sketch a smooth curve.
58. Hyperbola
„ A hyperbola is a
generated by a point
moving so that the
difference of its distance
from two fixed points is
constant.
„ The two points are called
A B
the foci, and the constant
difference in distance is
called the transverse axis
of the hyperbola.
59. Drawing a hyperbola by the pencil and string method.
„ Let F and F' be the foci
and AB the transverse
axis, fasten the string at
F' and C. Its length is
FC - AB.
„ Fasten the straight
edge at F. If it is
revolved
about F, with the pencil
moving against it, and
with the string taut, the
hyperbola may be drawn
as shown.
„ Point C is selected at
random, its distance from
G depends on the desired
extent of the curve.
60. Drawing a hyperbola by the geometric method.
„ Select any point X on the
transverse axis.
„ With centers at F and F',
and BX as radius, strike the
arcs DE.
„ With same centers and AX as
radius, strike arcs to intersect
the arcs first drawn in the
points Q, R, S and T, which are
points on the required
hyperbola.
„ By selecting a different
location for the point X, find
as many additional points as
necessary to draw the curve
accurately.