STACY

THE NITRO RC CAR

Chris CiambellaCory Lazzarato

Jack GilliesJoshua MolinaJeremiah Gill

CATIA MODELING AND KINEMATICS PROJECTFOR AUTOTECH 2AC3

INSTRUCTOR: LUCIAN BALAN

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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

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THE NITRO RC CAR

Overview

• 219 components

• 300+ man-hours

• 65 “Final Assembly” Files

• 27 CATIA Crashes during assembly

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THE NITRO RC CAR

How It Works• 2-Stroke Nitro Engine

• Centrifugal Clutch Output Gears

• 2-Speed Transmission with Centrifugal locking for 2nd

gear

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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

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THE NITRO RC CAR

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THE NITRO RC CAR

Frustration

• 60+ hours for kinematics and assembly alone

• Save paths corrupted and work lost

• Many attempts to restart without success

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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

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THE NITRO RC CAR

There’s a Way

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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

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THE NITRO RC CAR Self Taught Parts

• Bevel gears generated from gear sketch produced in class

Cory Lazzarato

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THE NITRO RC CAR

Self Taught Parts..

• Coilover produced in the Generative Shape Design workbench

Cory Lazzarato

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THE NITRO RC CAR

Difficulties

• Assembly of Differential/ Drivetrain Kinematics

Cory Lazzarato

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THE NITRO RC CAR

The Engine

Chris Ciambella

Two Stroke Nitro Engine

42 Parts

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THE NITRO RC CAR

The Block

Chris Ciambella

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THE NITRO RC CAR

Wireframe & Surface Design

Chris Ciambella

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THE NITRO RC CAR

Wireframe & Surface Design

Chris Ciambella

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THE NITRO RC CAR

Wireframe & Surface Design

Chris Ciambella

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THE NITRO RC CAR

Chris Ciambella

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THE NITRO RC CAR Joshua Molina

21 Parts

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THE NITRO RC CAR

Top Component FrameJoshua Molina

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THE NITRO RC CAR Sheet Metal Design Joshua Molina

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THE NITRO RC CAR

Joshua Molina

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THE NITRO RC CAR

Joshua Molina

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THE NITRO RC CAR

Joshua Molina

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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

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THE NITRO RC CAR Gas Tank Assembly

• Padded Body with chamfered sides

• Padded extremities

• Shell Body

• In-Context design of lid

• Assembly

Jack

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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

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THE NITRO RC CAR Transmission Jack

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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

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THE NITRO RC CAR

Muffler• Revolved splines to

generate shape

• In context design of bolt lips

Jack

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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

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THE NITRO RC CAR

Rear suspension - Jeremiah

• 34 different parts

• 3 sub assemblies

Jeremiah

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THE NITRO RC CAR

Symmetry Function• Problem: part needed to be

mirrored, but I cannot mirror and delete the original

Jeremiah

STACY

THE NITRO RC CAR Symmetry Function

• In the assembly workbench insert the part

• Go to insert Symmetry

Jeremiah

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THE NITRO RC CAR

Symmetry Function

• Select a plane and the object to mirror

Jeremiah

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THE NITRO RC CAR

Symmetry Function• New part created symmetrical to the other

Jeremiah

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THE NITRO RC CAR

Creating a spring

• Use wireframe workbench

• Draw a helix

Jeremiah

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

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THE NITRO RC CAR

Questions?