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
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
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
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
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