GEAR CONCEPT MODELS HILHI ROBOTICS Mr. Domes

BUILD THIS BASE FIRST NAME______

4 BUMP AXLE & BUSHING

40 TOOTH GEAR

1. DIRECTION OF ROTATION – 20 POINTS______

___ LOOK UP AND WRITE A DEFINITION OF TORQUE______LOOK UP AND WRITE A DEFINITION OF RATIO ______LOOK UP AND WRITE A DEFINITION OF ROTATION______USE YOUR FINGERS TO ROTATE THE DRIVER AND FEEL THE TORQUE ON THE FOLLOWER GEAR. ___ DRAW ARROWS TO SHOW DIRECTION OF ROTATION FOR EACH GEAR.

FOLLOWER

DRIVER

The gear ratio is the number of rotations of the driver gear compared to rotations of the follower gear. Turn the driver gear and observe rotations of the follower gear. Use a transparency pen to color the teeth where both gears meet. This will help you keep track when you count rotations. ___ WRITE THE ROTATIONS OF THE DRIVER______and FOLLOWER ______gears. ___ NOW WRITE THE GEAR RATIO AS driver : follower _____ : _____

WRITE THREE OBSERVATIONS: ___1 ___2 ___3

of 4 GEAR CONCEPT MODELS HILHI ROBOTICS Mr. Domes 2. GEARING UP – 10 POINTS ______DRAW ARROWS TO SHOW ROTATION.

8 TOOTH FOLLOWER

40 TOOTH DRIVER

___ COUNTING GEAR ROTATIONS, WHAT IS THE GEAR RATIO?_____ : _____

___ COUNT THE NUMBER OF TEETH ON BOTH GEARS: FOLLOWER _____, DRIVER ______HOW DO THE NUMBER OF TEETH RELATE TO THE NUMBER OF ROTATIONS? ___ CAN YOU USE THE NUMBER OF TEETH TO DETERMINE GEAR RATIO? ___ WHICH GEAR TURNS FASTER? SLOWER? WRITE THREE OBSERVATIONS: ___1 ___2 ___3

3. GEARING DOWN – 10 POINTS ______DRAW ARROWS TO SHOW ROTATION.

FOLLOWER

DRIVER

___ WHAT IS THE GEAR RATIO? _____:_____

___ WRITE THREE OBSERVATIONS: ___1 ___2 ___3

of 4 GEAR CONCEPT MODELS HILHI ROBOTICS Mr. Domes 4, IDLER GEARING – 10 POINTS ______

___ DRAW ARROWS TO SHOW ROTATION

FOLLOWER

DRIVER

___ DOES THE SPEED CHANGE?

___ DOES THE DIRECTION OF ROTATION CHANGE? ___ WRITE THREE OBSERVATIONS: ___1 ___2 ___3

5. AT AN ANGLE – 10 POINTS ______DRAW ARROWS TO SHOW ROTATION

24 TOOTH CROWN GEAR ASSEMBLE THESE PIECES THEN PUSH DOWN ONTO BASE

8 TOOTH GEAR FOLLOWER

DRIVER

___ WHAT IS THE GEAR RATIO? _____:______WRITE THREE OBSERVATIONS: ___1 ___2 ___3 Page 3 of 4 GEAR CONCEPT MODELS HILHI ROBOTICS Mr. Domes

6. COMPOUND GEARING – 10 POINTS ______USE TWO 40 TOOTH GEARS AND TWO 8 TOOTH GEARS ___ PLACE 8 TOOTH GEAR ON ONE END AND 40 TOOTH GEAR ON OTHER END OF AXLE ___ DRAW ARROWS TO SHOW ROTATION

8 TOOTH 40 TOOTH FOLLOWER

DRIVER

___ WHAT IS THE GEAR RATIO _____:_____

___ WRITE THREE OBSERVATIONS: ___1 ___2 ___3

7. DESIGN A COMPOUND GEAR RATIO OVER 50:1. – 30 POINTS ______MAKE A PREDICTION AND SHOW YOUR INSTRUCTOR (MAKE A SKETCH OF WHAT YOU WANT TO BUILD), THEN BUILD IT ____ COUNT THE ROTATIONS TO VERIFY THE GEAR RATIO ____ : ______EXPLAIN HOW THIS WORKS TO ANOTHER PERSON ____ SHOW IT TO YOUR INSTRUCTOR – HAVE THE INSTRUCTOR INITIAL HERE______