When do you include theprojection angle symbolon plans? When you are working on plans that will be used in Europe or Asia.
ELLIPSE TEMPLATESThese ellipse guides are usually designated by the ellipse angle, theangle at which a circle is viewed to appear as an ellipse.
DRAWING A FOCI ELLIPSE Major axis = long axis of ellipse Minor axis = short axis of ellipse The foci of the ellipse are two special points E and F on the ellipses major axis and are equidistant from the center point. The sum of the distances from any point P on the ellipse to those two foci is constant and equal to the major axis ( PE + PF2= 2A ). Each of these two points is called a focus of the ellipse.
DRAWING A FOCI ELLIPSE Let AB be the major axis and CD the minor axis To find foci E and F, draw arcs R with radius equal to half the major axis and centers at the end of the minor axis Between E and O on the major axis, mark at random a number of points. Using a random point (point 3), with E and F as centers and radii A-3 and B-3, draw arcs to intersect at four points 3’. Use the remaining points to find four additional points on the ellipse in the same manner. Sketch the ellipse lightly through the points
Drawing an Ellipse Draw a major axis 5” long and a minor axis 2.5” long. Draw an ellipse by the foci method with at least five points in each quadrant
DRAWING AN ARC TANGENT TO TWO LINES AT ACUTE OROBTUSE ANGLES Given two lines not making a 90° Draw lines parallel to the given lines at distance R from them to intersect at C the center From C, drop perpendiculars to the given lines to locate tangent points, T With C as the center and with given radius R, draw the required tangent arc between the points of tangency
DRAWING AN ARC TANGENT TO TWOLINES AT ACUTE OROBTUSE ANGLES Draw two intersecting lines at an acute angle, each 2.5 inches long Draw a 1.5 inch radius arc tangent to the two lines
How Many Questions areon the Test? 50 You have the entire class period to complete the test
How are the questionsformatted? True and False Multiple Choice Fill in the Blank Essay Questions Drawing
What can I bring? All of your drawing utensils A Calculator This is NOT an open book exam. Other electronic devices can not be used in place of a calculator
What do I need to knowhow to draw? Circles Squares Bisect an angle Perpendicular Bisect a line Triangles Orthographic Sketches Alphabet of Lines Lettering
What Chapters in theBook Will be Covered? Chapter 1 Chapter 2 Chapter 3 (Sections 1-5) Chapter 4 Chapter 5
What Should I Use toStudy? Class Notes (Power Points on Blackboard) Class Notes you took Homework Textbook
Potential Topics on Test Identify and Describe the five phases of the design process Identify what technical drawings are used for Identify why drawing by hand is still useful Identify who creates technical drawings and what professions use them Draw & Identify the Alphabet of Lines
Potential Topics on Test Apply civil engineering scales to sketches of simple objects Apply architectural scales to sketches of simple objects Scale a drawing up or down using scale ratios (ex 1:2, 2:1) Apply standard lettering practice and standards to sketches Identify negative space
Potential Topics on Test Describe Prisms Describe Cylinders Describe Pyramids Describe Cones Describe Spheres Describe a Torus Describe Ellipsoids
Potential Topics on Test Describe Parallelograms Describe a Trapezoid Describe a Trapezium Describe a Regular Polygon up to 8 Sides Describe a Circumference of a Circle Describe Diameter of a Circle Describe Radius of a Circle Describe a Quadrant of a Circle Describe a Chord of a Circle Describe Concentric Circles Describe Eccentric Circles Identify the point at which a line is tangent to an arc Identify the pint at which an arc is tangent to an arc
Potential Topics on Test Differentiate between the 1st and 3rd Angle Projection Name and position the 6 primary views Create orthographic sketches of simple objects Transfer dimensions Apply hidden line conventions to sketches Apply line precedence conventions to sketches
What are you confused about? Write down a question that you still have about a topic that will be covered on the test. Share the question and topic with your group As a group determine the answer to the question Still stumped? Ask a neighboring group Classroom stumped? Save the question for the end and ask me
Stand up and Stretch . . . It’s time for a review game!
Information Domination Which Team Will Dominate? Winning team will each receive 5 extra credit points. Pick a team name Team members pick a category and answer the next question in that category All question are answered in order starting with 1 then 2, etc. If the team answers correctly, they get 2 points If they have to use their text to answer, they only get 1 point If nobody on the team is able to answer the question correctly, they can say “pass.” The next team gets a chance to answer for 1 point.
VIEWS OF SURFACESThere are terms used for describing a surface’s orientation to the plane ofprojection. The three orientations that a plane surface can have to the planeof projection are normal, inclined, and oblique. Note how a plane surface that is perpendicular to a plane of projection appears on edge as a straight line
Inclined Surfaces An inclined surface is perpendicular to one plane of projection It is inclined or tipped to adjacent planes Inclined edge is parallel to one plane of projection and appears true length on this plan (appears as angled line) Inclined edge appears as a foreshortened line on adjacent planes (appears as horizontal or vertical line)
“Inclined” Group Project Each group gets a right triangular prism Draw the three necessary views What was different about drawing the inclined planes versus the normal planes (with the blocks)?
Oblique Surfaces An oblique surface is tipped on all principal planes of projections It does not appear on edge or true size in any standard view An oblique edge appears foreshortened and at an angle in every view
“Oblique” Group Project As a group, try to think of any oblique surfaces you have seen at home, work, or on your way here tonight. Sketch up a few and present to class
ANGLESIf an angle is in a normal plane (a plane parallel to a plane of projection) it willshow true size on the plane of projection to which it is parallel.