Mindstorms NXT - Arachno 2

Here is the second version of my spider robot. It carries two motors on its back, but no brick. It can effectively turn to avoid obstacles (unlike V1), by using the ultrasound sensor to detect proximity.

The brick is dragged along by the cables (they are three and kept together to prevent damage to either the cables, the brick, or the spider). It uses three caster wheels in order to allow it to follow the spider in any direction it may take. Problems arise when it has to turn a sharp corner, as the cable may get tangled, and it may run into the brick.

I tried to design it with the brick on its back, but there were only two ways to do it:

1 - With the motors on the sides of the brick. This caused the legs to be too far apart, and not be able to maintain the weight.

2 - With the motors side to side below the brick. I thought this one may work, so I tried it. Problem was again the weight, which caused the legs to angle inwards and cause gear clicking.

Overall, Although the brick tagging along behind isn't very good, it solves all the problems that it had while being on top, and didn't cause as many problems.

Please leave any comments / ideas / suggestions. Tell me what you think, what I should do, whether you like this or V1 more :)

Category:

Entertainment

Tags:

• spider
• robot
• mindstorms
• nxt
• walker

[Nanometer45]

pretty cool

[Kruthorgaren]

Thank you! : )

[computermedic64]

I agree with carpenoctem, I had to make a solid center to carry the mindstorm brick, that took a ton of technic beams and pins.

[carpenoctem1973]

That's a very nice spider. But i think you can manage to carry the brick by enforcing the center of the body. Take a look at my walkers, they may give you some ideas. I made a bracket for the legs on the top of the body which gives more stability to the walker and enables bigger steps. Hope that helps.