spur gears essential characteristics: what things are absolutely necessary for something to be a...

6

Upload: flora-greene

Post on 30-Dec-2015

218 views

Category:

Documents


1 download

TRANSCRIPT

Page 1: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some
Page 2: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some

SPUR GEARSEssential Characteristics:

What things are absolutely necessaryfor something to be a spur gear?

Non-essential Characteristics What are some things about a spur gear?

Examples Provide examples of a where a spurgear is used or found.

Non-examples Provide examples what is not a spurgear.

Page 3: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some

Essential Non-essential

Examples Non-examples

SPURGEARS

PULLEYS

WHEELS

ROLLERS

DIFFERENT SIZES

SHAPE OF TEETH

CLOCKWISE / COUNTER

WORK WITH WHEELS/AXLES

ELECTRIC SCREWDRIVER

OSCILLATING SPRINKLER

WINDUP CLOCKS

WASHING MACHINE

BICYCLE WHEELS

CIRCULAR

TEETH (EVEN)

USED FOR SPEED

AT LEAST TWO NEEDED

PARALLEL SHAFT

Page 4: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some

WHAT ARE GEARS?Gears are simple machines that are used to transfer motion from one place to another.

By changing the size of the gears you can also change the force required to turn the gears.

They can be used to speed up, slow down, or just transfer the motion (in the form of rotation).

Page 5: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some

A gear is a wheel with teeth around the outer rim.

A gear train requires that two or more gears be

connected with same sized teeth that are the same distance on each gear.

A gear ratio is when you compare the number of teeth

on the gear on which the force is being applied (the drive) with the number of teeth on the gear

being turned.

Page 6: SPUR GEARS Essential Characteristics: What things are absolutely necessary for something to be a spur gear? Non-essential Characteristics What are some

Build a TANKBOT using grey instruction duo-tangs.

Modify your TANKBOT to use the tires and gears rather than the treads.

Perform each of the three trials specified in Gears Exercise.

After each trial record your information on your sheet then the projector table.

Compare the results of each gear ratio and the time it took to travel 1 meter.

On your Group Table sheet record your prediction of the fastest gear ratio and explain your choice.

REMEMBER

Take turns at the timing stations.

Work cooperatively in your group and as a class.

Encourage – this is a CHALLENGE not a CONTEST!!!