Procedure 

  • Problem 3-19 & 3-20 are in Inches, problem 3-21 is Metric.
  • Do as many drawings below as you can in the time available.  
  • Follow the same procedures as the previous tutorials.  
  • Dimension these drawing.
  • For a closeup open problem3_19_to_3_21.pdf and zoom in as needed.
  • Center the drawings, scale, print, staple together and hand in to be marked.
  • See Hint For Problem 3-19 at Bottom Of This Page!

Hint for 3-19 – How to find the center of arc “R” 

  • First draw as much as you can.
  • From the center of the 0.25 radius arc (center mark on the left) draw a 1.88 radius circle.
    • 1.88 is derived from adding the 0.25 and 1.63 arcs
    • 0.25 + 1.63 = 1.88
  • From the center of the 4.18 diameter circle (center mark on the right) draw a 0.96 radius circle.
    • 0.96 is derived from finding the radius of the 4.18 diameter circle and dividing by 2 to get the radius then subtracting for the 1.13 radius arc
    • 4.18 ÷ 2 – 1.13 = 0.96
  • The “R” radius arc is drawn from the center to the TANGENT of the R3.0 circle.
  • The R1.13 radius arc is drawn from the center to the TANGENT of the 4.18 diameter circle.