Second Year Advanced CAD Project

1. STACY
THE NITRO RC CAR
Chris Ciambella
Cory Lazzarato
Jack Gillies
Joshua Molina
Jeremiah Gill
CATIA MODELING AND KINEMATICS PROJECT
FOR AUTOTECH 2AC3
INSTRUCTOR: LUCIAN BALAN

2. STACY
THE NITRO RC CAR
The Car
• Unknown Brand
• Bought “From China”
• 2 different cars – one to
take apart and model,
the other for assembly
reference
Group

3. STACY
THE NITRO RC CAR
Overview
• 219 components
• 300+ man-hours
• 65 “Final Assembly” Files
• 27 CATIA Crashes during
assembly
Group

4. STACY
THE NITRO RC CAR
How It Works
• 2-Stroke Nitro Engine
• Centrifugal Clutch Output
Gears
• 2-Speed Transmission with
Centrifugal locking for 2nd
gear
Group

5. STACY
THE NITRO RC CAR How It Works
• Universal drive shafts to front/rear differentials
• Universal shafts from differentials to wheels
• Servo-driven steering and throttle
• Brake applied to transmission shaft upon throttle
reverse
• Overall ratio of 6.7685 crankshaft turns per wheel
turn in first gear
Group

6. STACY
THE NITRO RC CAR
Group

7. STACY
THE NITRO RC CAR
Frustration
• 60+ hours for kinematics and assembly alone
• Save paths corrupted and work lost
• Many attempts to restart without success
Group

8. STACY
THE NITRO RC CAR
When There’s A Will…
• File of all rigid parts in assembly made called “The Gods”
• Moving parts inserted into The Gods and Kinematics added
Group

9. STACY
THE NITRO RC CAR
There’s a Way

10. STACY
THE NITRO RC CAR
• Front Differential
• Front Suspension
• Drive Axles
Responsibilities - Cory
• Steering Knuckles
• Coilover Suspension
Cory Lazzarato
“Never have I wanted less from
a program.”
-Cory
40 Parts

11. STACY
THE NITRO RC CAR Self Taught Parts
• Bevel gears generated from gear
sketch produced in class
Cory Lazzarato

12. STACY
THE NITRO RC CAR
Self Taught Parts..
• Coilover produced in the Generative Shape Design workbench
Cory Lazzarato

13. STACY
THE NITRO RC CAR
Difficulties
• Assembly of Differential/ Drivetrain Kinematics
Cory Lazzarato

14. STACY
THE NITRO RC CAR
The Engine
Chris Ciambella
Two Stroke Nitro Engine
42 Parts

15. STACY
THE NITRO RC CAR
The Block
Chris Ciambella

16. STACY
THE NITRO RC CAR
Wireframe & Surface
Design
Chris Ciambella

17. STACY
THE NITRO RC CAR
Wireframe & Surface
Design
Chris Ciambella

18. STACY
THE NITRO RC CAR
Wireframe & Surface
Design
Chris Ciambella

19. STACY
THE NITRO RC CAR
Chris Ciambella

20. STACY
THE NITRO RC CAR Joshua Molina
21 Parts

21. STACY
THE NITRO RC CAR
Top Component Frame
Joshua Molina

22. STACY
THE NITRO RC CAR
Sheet Metal Design Joshua Molina

23. STACY
THE NITRO RC CAR
Joshua Molina

24. STACY
THE NITRO RC CAR
Joshua Molina

25. STACY
THE NITRO RC CAR
Joshua Molina

26. STACY
THE NITRO RC CAR
Responsibilities - Jack
• Gas Tank Assembly
• Transmission
• Wheel & Tire
• Muffler Assembly
• Frame
• Bumper Assembly
Jack
“No, YOU’RE unnecessary”
-Jack
36 Parts

27. STACY
THE NITRO RC CAR Gas Tank Assembly
• Padded Body with
chamfered sides
• Padded extremities
• Shell Body
• In-Context design of lid
• Assembly
Jack

28. STACY
THE NITRO RC CAR
Transmission
• Brackets painstakingly measured
• Initially spur gears, changed to
helical gears
• Shaft made by…shaft command
• Functional shaft brake using cam
lever
• Omitted centrifugal clutch on 2nd
gear

29. STACY
THE NITRO RC CAR Transmission Jack

30. STACY
THE NITRO RC CAR Wheel/Tire
• Shafted components
• Spline groove cut to curve
rim ribs
• Tangent plane for tread
sketch
• Tread circular & rectangular
patterned
Jack

31. STACY
THE NITRO RC CAR
Muffler
• Revolved splines to
generate shape
• In context design of
bolt lips
Jack

32. STACY
THE NITRO RC CAR Out-of-Class Component –
Helical Gears
• “Twist” angle of one
sides profile generated
by helix angle value and
height of gear
• Profile projected, rotated
• Surfaces generated
• Surfaces filled
Jack

33. STACY
THE NITRO RC CAR
Rear suspension - Jeremiah
• 34 different
parts
• 3 sub
assemblies
Jeremiah

34. STACY
THE NITRO RC CAR
Symmetry Function
• Problem: part needed to be
mirrored, but I cannot mirror
and delete the original
Jeremiah

35. STACY
THE NITRO RC CAR Symmetry Function
• In the assembly workbench insert
the part
• Go to insert  Symmetry
Jeremiah

36. STACY
THE NITRO RC CAR
Symmetry Function
• Select a plane and the object to mirror
Jeremiah

37. STACY
THE NITRO RC CAR
Symmetry Function
• New part created symmetrical to the other
Jeremiah

38. STACY
THE NITRO RC CAR
Creating a spring
• Use wireframe workbench
• Draw a helix
Jeremiah

39. STACY
THE NITRO RC CAR
Creating a spring
• Use rib command and
make the sketch follow the
helix
• Create flat ends on the top
and bottom
Jeremiah

40. STACY
THE NITRO RC CAR
Questions?