Let's Make Robots!

Nano Sumo (Mechanical)

Eliminates the opponent inside the Nano-Sumo ring

  This is our Nano-Sumo robot. I say "our" because it is a team effort between Patrick McCabe and myself. Here is the link to Patrick's Electronics post. We talked a while and decided to create a bot based upon a team effort. The Nano-Sumo idea was used as it was small... yeah, very small, and we wanted a good challenge since it was a team effort.

  I started the mechanical design back in July. It was decided that I will do the design and build 2-identical Nano-Sumo bots. Patrick was to create the electronics and we would send the parts to each other for the final assembly. I am just posting the mechanical part and you can see Patrick's Nano-Sumo post for the electronics and the completed robot video.

 


 

 The Nano-Sumo rules are for a 25mm x 25mm size robot. I looked around for a while and the only gearbox I could find that would fit my working envelope was the SolarBotics #GM-15. Check the datasheet for all the details.

 Here is what you get. 6.0mm diameter x 20mm length planetary gearbox with a pager motor. The output shaft is made for a drive belt. The motor's output shaft comes out on each side of the robot gearbox holder.

  This photo below shows the 2-Nano-Sumo bots exploded. The black part holds the gearboxes and wheels. The rubber o-rings are the tires. They are 12mm diameter x 1.5mm cross section. The axles ride in the brass bushings and are retained by E-type retainer rings. Everything is held together by #2-56 flat head screws.

 


 

  The wheels are machined from aluminum with the drive belt grooves also machined as one piece. Axles are 2.39mm diameter steel.

 


 

So here is the completed mechanical Nano-Sumo bot .

 As I said earlier in this post, see Patrick McCabe's post of the Nano-Sumo for a complete description af all the electronic components and a video.

 Thanks for looking at our Nano-Sumo robot!

 

 

 

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Love this tiny bot.

But where did you find those small plugs (headers) for the motor power cable?

Thanks Geir for the comment! Actually the motors came with the header attached. Only down side is the 2mm pin spacing. Everything else uses the 2.54mm spacing so I can't just plug them in.

These are very cool!

This is amazing! can i ask what the black box is, potting box?  I want to see two battle it out :D

 The "black box" is just a plastic (Delrin) case that was machined to hold the (2)-motors and the axle bushings. I had a piece available and it is easy to machine. The color is just the natural color of this type of Delrin.

  When I get my electronics done I plan to send the bot to Patrick so they can battle each other.

I  dont understand how this nano sumo bot will turn left or right ,i can see one motor only ,how it will turn with one motor only?

flokos, the bot has 2-motors. Look at my primary photo. It shows 2-sets of red & black wires. One set for each motor. Each motor powers one axle and wheel. The motors output shaft is on each side of the robot.

Yes you are wight i thought that the other set of cables were for  a sensor or something else.

Although only one motor is shown in the pictures, the info at the top of the post shows : 2x Solarbotics #GM-15 Motor/Planetary Gearbox.

I have to say that Gary really impressed me with his mechanics on this. Would not have been possible with out his design and machining work. Great job Gary!