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Okay, if you are looking to build a K'nex differential. Then I probably do not need to tell you what it does.

If you don't know what a differential is, watch this video.

Step 1: Gathering Materials

This is one of the smallest K'nex differentials. Also This doesn't use a lot of parts.

Following is a list of the required Parts

6x Blue 7 pins connector

6x Purple 4 pins connector

2x Yellow Half round connector

8x red quarter round connector

7x White round connector

2x orange 2 pins straight connector

2x Red rod (5 1/8 in)

10x yellow rod (3 7/16 in)

7x blue rod (2 1/4 in)

5x white rod (1 5/16 in)

20x Green rod (3/4 in)

8x light blue spacer

6x gray spacer

1x yellow gear wheel big

2x yellow gear wheel medium

2x grey gear wheel small

Total Part count: 94

Step 2: Building the Gear Room

Okay this is an easy step. I suggest First making the blue rod with the 2 yellow gears. Then building the housing around it.

Step 3: Axle Assembly

Now, time to make the two axles.

Step 4: Diff Stand

The last step is to make the stand so you can present it (for instance).

Step 5: Final Product

if you correctly followed my steps you should end up with something that looks like this

<p>what does it do?</p>
<p>Both driven wheels of the car need to be rotating at a different speed when going around a corner.</p><p>When you put the wheels on one axle, one would slide, because it cannot rotate at a different speed.</p><p>This device lets the wheels spin at different speeds while both powering them.</p><p>In the top of this instructable is a link to a youtube video explaining the function of a differential. <a href="https://www.youtube.com/watch?v=yYAw79386WI" rel="nofollow">Here</a> again the link to the video.</p>
great, thanks for the explanation, now i see why you won :)
<p>Congratulations on being a finalist!!! :D</p>
<p>Cool!</p>
<p>Fantastic job!</p>

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