Stability Issues with Building the T-R3X Dinosaur

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I was having stability issues with Daniel Benedettelli’s T-R3X Dinosaur robot as featured in his book: THE LEGO MINDSTORMS EV3 LABORATORY. When he walked he was quite unstable, especially during turns, or long straight runs where he suffered from the speed wobbles. I build him to entertain some lower Primary School Students, so I had to get him stable on his pins to avoid thier bad press.

T-R3X Dinosaur

I decided to add some weight to his legs, just above the feet, but all my LEGO Boat Weights are being used in other Robots. So I decided to head to the local Gun Supplies Store just down the road for some Lead Ingots. It turned out that these where a little hard to locate, but they had a substitute which would fit neatly into T-R3X’s Legs.

It turned out that they had had a carton of faulty 12 Gauge Shotgun Slugs. These were not the usual balls of lead, but the Lead Slug meaured 20mm in diameter, 25mm long and weigh 85g. And where as aerodynamic as a house brick. They where used for descaling Cement Power Tanks, as well as Cement Truck Bowls.  Defiantly not a job I would want, although I have the hearing for it…..I attached a 12 Gauge Shotgun Slugs to each Leg with a cable tie and the stability issues where resolved.

Dinosaur Leg Weights

The 12 Gauge Shotgun Slugs where fitted too his lower legs and held in place with some Cable Ties. With the first test, he was no longer getting the speed wobbles and falling over all the time. Success!



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