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Robotic Fish

I havn't done anything with the fighting robot or the fish for years. But amazingly the fish still runs!


Below is the robot fish in phase 'B', a kind of catch up stage between the degree and the the masters. The main part of this stage has been to get the robot in water and fit it with an extra microcontroller.

The next stage was phase 'C', the masters degree. This involved looking into moving around an aquatic enviroment and geting some feedback from it. Artificialy inteligent is pushing it a bit, but as a project it does need to be able to hold itself at a constant depth.
I'm all fished up at the moment, so its on top of the wardrobe awaiting a good testing session.



Is a robot fish for you? I'm not even sure its for me! As a degree topic its a bit of a rush in 24 weeks (along with the other modules). It has been a fascinating subject to research and then copy in metal. The main mission statement is to think about being water tight from the first pen stroke. Any deviation and you are quite literally sunk!

Whats the design Process ?
Step 1: Have a good look at real fish.
Step 2: Search the web for other robot fish.
Step 3: Read how fish move.

Step 4: Plan out the required parts.

Step 5: Design on computer the bits that need making.

Step 6: Print off the drawings and start turning out parts.

Tools and Materials

Absolutely not doable without a mig welder, lathe, milling machine, taps and dies. This is more like an aquatic watch than a robot and its got to be right or everything elecricky will go pop.

Masters degree work: An additional body segment and sensing whiskers.

Robotic Fish With Petcoral Fins

The robot fish is seen above seperated 'opened out' on the building jig. This makes it look much longer than it is. One of the design features of the fish is that it is oval and parallel with the same bolt pattern. Because of this, a segment 60mm long segment could be popped into the robot between head and body. This holds four servo motors that rotate and flap the pectoral fins. The fins are built in the same style as the tail fin.