Instructables

Remote Controlled Basket Ball Robot - HARLEM GLOBETROTTERS -

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Picture of Remote Controlled Basket Ball Robot - HARLEM GLOBETROTTERS -
Here I will show you how to build a remote controlled basketball robot. That's right, no joke! I have built a similar ball for the HARLEM GLOBETROTTERS and now you can build your own.

Here's a list of supplies you'll need.

Petsmart:
7" Hamster Ball

Sports Shop:
Basketball

www.servocity.com:
High Torque Metal Gear Servo. I used the HS-645MG
Aluminum Servo Shaft Horn 250HS
(3) Aluminum Hubs 3463H
RZ12-90-128RPM Gear Motor
Servo Mounts
Gear Motor Mount
(2) 1/8 ID Bearings
1/ 4 ID Bearing

Any Hobby Shop:
2 channel radio and receiver set (More channels are fine)
Gyro
(8) Elite 1500 batteries
Cheap ESC (Electronic Speed Control)

Hardware Store:
3/ 4" Aluminum Flat Stock
3/ 4" Steel Flat Stock
Misc Nuts and Bolts
Double Stick Tape
Lead weights (Or steel)
Great Stuff Expanding Foam
 
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Step 1: Sketch / Plans for the Ball

Picture of Sketch / Plans for the Ball
Here are rough drawn plans for the ball. It has a Gyro for stability control, a servo for steering and a gear drive motor for propulsion. This ball moves only because the weight at the bottom moves. So, the idea is to get as much weight as far below the centerline as possible. Led or steel weights are added to help.

Step 2: Attach Drive Hub To Ball

Picture of Attach Drive Hub To Ball
Ball602.JPG
Attach the aluminum hub from servocity to the ball using screws as shown. Take care to make sure it's on the centerline.

Step 3: Make the Chassis

Picture of Make the Chassis
Ball604.JPG
Ball605.JPG
Ball606.JPG
Ball607.JPG
Next make the chassis. You can make it out of one piec of Aluminum if you prefer or bolt together 3/4" flat stock. The important thing to remember is to keep all servo splines, bearings, motor shaft in the same plane. Other than that everything can fudge a little.

Take a look at all the pics and you'll get a good idea of what you need to do.

Attach another one of the aluminum hubs to the gear motor drive shaft. Screw some bolts into it and sand them down so they fit nicely in the hub that you just mounted to the ball.
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aikramer25 days ago

What is the degree of motion of your servo? 90, 180 or continuous?

prabbit22m (author)  aikramer25 days ago
The steering servo is 90 degrees. I experimented with continuous and it wasn't good.
jake_lee10 months ago
This is awesome, definitely going to make one to trick my dog
This is awesome! I think Sphero has a mechanical design something similar to this? Anyways I will definitely be making one..
doshh3 years ago
Are those geared motors u mentioned for the ball brushed or brushless? tnx ^^
imran_bhoot3 years ago
what does Gyro basically mean? Would you please lighten ma ignorance? :-/
eulaliaaaa!4 years ago
It would be easier just to put a toy truck in the hamster ball and drive that around...
What happens if it flips over?
True.
Unless you put wheels also on the top, then it might work
Or you could get one of those cars with huge wheels that can do flips on walls and stuff.
About how much could I expect a project like this to cost? Not counting the multi-channel transmitter, I suppose, since that would drive the cost up considerably.
toxicwolf5 years ago
I used your concept and made a tennis ball size version
I'm really curious to see your remote controlled tennis ball! I've been thinking that an RC soccer ball or something similar would be a great toy for my dog, but a tennis ball that I can bring back to myself if she decides she doesn't want to fetch it? That's effing brilliant!
with built in camera
prabbit22m (author)  toxicwolf5 years ago
Can we see some pictures or video?
sorry but I don't have any pics and I sold it but ill make another and do an Instructable on it but it might take a while before I can make it though
i wanna see this.
5 weeks away from finishing just got to find the right type of board to control it
It is longer that 5 weeks.
And this looks very cool!
dude i totaly forgot been so busy with school and other projects i try to finish         i havent check this account in a long time
Bogus.
ive officially given up every time i worked on it something went wrong ;something went wrong my nephew broke it twice and my camera was at my friends when his house burned down
Dang talk about bad luck.
I think he is lying...
O my god I've been trying to do the same thing. How ever did you get it so small ( the robot i mean) you have to post an indestructible on it
sorry, this is going to be stupid, but

could this be applied to a much larger sphere 2.5 m diameter
and what size motor would you need and how much would the counter weight have to weigh to get a good speed (min 20 kmh 30-40 kmh good)

and is there a formular for calculating the speed.
it would in theory need circumfrance, counter weight mass and lenght of the arm,
and motor strength i think?
Tobor 2.04 years ago
try making it small enough to fit in a tennis ball and post the instructions. if you already have and i missed it pleas say so.
gradof6b4 years ago
When this spins is the whole internal thing, like the weight and stuff that's spinning or are they stationary as the ball spins?
hintss gradof6b4 years ago
stationary, weights move the ball because they're always down
how much did it cost to make this?
were you fill up air did you put some kind of rechargeable power socket 
ElvenChild4 years ago
 If I put this inside a soccer ball I could cheat I mean coach easier
 More details on how it is made, please!  These instructions seemed somewhat vague.
platinum975 years ago
Hey I love ur idea. This would freak my friends and my parents out but I'm not that advanced and I don't have most of those things, so can iu help me make a simpler version of this just by using a dc motor and a smaller ball to put it in?
bocaj8125 years ago
If this were an actual robot built using a micro-controller you could program the steering arm to be electronically forced to go back and stay in the center of the ball when not in steering action. I love the instrucwble though. I plan on building one myself.
Actually thats not true i myself am building this robot from scratch using a micro controller for a school project. on this guys robot the arm has centered itself. the gyro is used to dampen the rocking motion not to centre the arm.
necropolian5 years ago
very supercalifragilisticexpialidociously cool! can you play basketball with it whitout destroying the inner technologies? 5*
prabbit22m (author)  necropolian5 years ago
First of all the ball won't bounce. Second, it would probably destroy the steering servo pretty quick. When taking this ball to the park I have to say it's VERY hard to walk with a ball in your hand and not bounce it. -Peter
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