Rack-and-pinion gears are used to change rotational movement (the yellow and gray gears with the rubber band going around it) to linear movement (the side-to-side movement going across the white pieces or racks). The steering system in cars is a good example of rack-and-pinion gears at work.
Parts I'm using today:
I'm making do with what I have. I'm pretty sure they'll work fine. If not, we'll just have to figure things out as we go.
Let's build:
1st design for the motor support.
In this state, it wasn't the white rack that moved from side-to-side, but the gears moving awkwardly.
So, I removed some support pieces, and stuck the motor on a bigger, anchoring piece. But this still moved things enough that the video didn't turn out very well. So, when I was recording the video, the gray platform had to be held down.
It was still neat to watch.
Here's a video. Enjoy!
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