So, lets build one!!! We will hack a damaged toy car, assemble some junk pieces and add green silicone rubber, courtesy of Instructables and Sugru!
Step 1: Testing SUGRU.
I had to know if SUGRU was that good, if it was a good choice for the project, how much SUGRU I could find in a sachet and how many sachets I could use. And find out if I am allergic to SUGRU (luckily, I'm not).
In the contest I found a great instructable that gave me some lights:
But, nothing like the empirical experience. So, in a non-related experiment, I repaired the broken band of my favorite watch. I used one black sachet. The superglue was only for keep togheter the pieces while Sugru cures (Before this experiment, I tried to repair the watchband with superglue only, and it was a bad idea).
The result? SUGRU IS AWESOME! And I think it's enviromental friendly because, if you make a good work, you don't have to thrown away your damaged plastic stuff. Just fix it and it will last for some more years. I made this experiment two weeks ago, and the watchband don't show rupture signs.
I has one suggestion: it will be good more Sugru colours. Yellow, pink and red would be great.
Well, let's go to the main project.
Step 2: Recipe for World Domination!!!!
1 electric toy car (you will need one who rolls straight forward)
2 3D glasses (we will need the glasses 4 legs)
1 AC adapter plastic box
6 iron angles
1 long plastic bar (I used one from a printer. You will need to cut it in two equal bars)
1 rectangular plastic piece
1 Big LED
1 AA 2 batteries holder
1 conic plastic piece
3 green Sugru sachets
1 deodorant cap
1 facial cream cap
red and black wire
screws and bolts
Dremel Rotary Tool
And don't forget the classic building rules:
1. If you don't have it, replace it!
2. Use protective equipment (dust mask and goggles)
3. Beware of drilled and soldered hot surfaces
4. Work in a good ventilated area.
5. Always have junk in stock
Step 3: Hacking the toy car
Because of the fragile plastic cover of the gearbox, using screws to attach it to the adapter box wasn't the best idea. So, I have two options: superglue o black Sugru. Both are good enough, but each one has its advantages and disadvantages:
- Superglue: it's instantaneus and strong enough. On the other hand, it leaves white dust, it's eye-irritating and if you are a beginner, you could leave scraps of cyanoacrylate in the project or worst, stick permanently the gears.
- Sugru: when it cures is great, but you have to wait 24 hours before continuing with the project. And is a little bit bulky.
Step 4: Crank mechanism
But remember something important: one wheel must have its angle directed to the front. The other wheel must have its angle directed to the back. This configuration allow the alternate movement. This is a video of how works the crank mechanism:
If you do it wrong (both angles directed to the same side), the result will be a little bit... disturbing.
Step 5: The legs
Step 6: Electronics and closing the body
Step 7: The Invader!!!!!!!
Well... WHAT ARE YOU WAITING TO INVADE THE WORLD??? :-)
Step 8: The thing with the Sugru grip in the legs...
But you will never forgive me if I don't show proofs. So I put some Sugru on the legs, with two variants: Sugru in the four legs and Sugru only in the front legs (sillyzombie666's idea).
Four legs with Sugru
The video explains itself.
Why it's not working? Sugru can be an excelent rubber grip for walking robots, but not for this, because the front leg and the back leg are practically the same piece. If you look carefully the Intro videos, part of the normal movement includes a little slip when the front leg downs (and the back leg ups). With the rubber grips, we don't have the slip, and blocks the legs.
Front legs with Sugru
It's a little difficult to start, but has a better grip when gathers momentum.
The choice is yours!