Picture of Brushbrobot
(18+ category) I'm 40 years old and I've constructed (with some help from my daughters!) this vibrobot (for those who do not know how they work, vibrobots shake due to the imbalance created purposefully in the shaft of their motors). I chose to call it Brushbrobot because it's a bristlebot, but big. 
This is much easier to construct than a small bristlebot and has better performance (bigger pieces, no need for a special vibrating motor, more standard battery, longer autonomy, on-off switch added). It also allows for a rechargeable battery (highly recommended).

Remove these adsRemove these ads by Signing Up

Step 1: Materials

Picture of Materials
Nail brush
9V motor (lower voltage motors could work too)
9V battery (rechargeable recommended)
9v battery clip
Crocodile clip
Piece of wire (any color. I got mine cutting in half the red wire from the battery clip in half, which was long enough)
Unipolar on/off switch 

Step 2: Tools

Picture of Tools

Soldering iron
Solder wire
Wire clipper
Hot glue gun
Glue bar

Step 3: Attach the wire to the switch

Picture of Attach the wire to the switch
Solder the wire to one of the switch's legs. If they have holes, you can thread and twist the wire, but keep in mind that the vibration may yank it loose.

Step 4: Attach the battery clip to the switch

Picture of Attach the battery clip to the switch
Solder the red wire of the battery clip to the other leg of the switch (again, you could twist it if the leg has a hole, but it's better to give it a stronger grip).

Step 5: Attach the motor

Picture of Attach the motor
Solder to the motor the free wires from the battery clip and the switch (does not matter which goes where).

Step 6: Attach the battery

Picture of Attach the battery
Attach the batery to the battery clip.

Step 7: Glue the motor and the battery

Picture of Glue the motor and the battery
Glue the motor and the battery to the top of the brush. Make sure the extreme of the motor´s shaft extends well beyond the edge of the brush.

Step 8: Glue the switch

Picture of Glue the switch
Glue the switch to the brush.

Step 9: Attach the crocodile clip

Picture of Attach the crocodile clip

Attach the crocodile clip to the motor shaft adding glue on and between its teeth (this is to avoid the clip from being ejected due to the vibration of the shaft as it revolves). If the shaft is wide enough or has a plastic cover, the clip may attach firmly without the need for gluing). BE SURE TO KEEP YOUR FACE AWAY WHEN YOU TURN THE BRUSHBROBOT ON.

It's done!

madhurdheer2 years ago
can u send me the scientific principle of it as fast as u can ?/
mad10000 (author)  madhurdheer2 years ago
Do you mean the principle behind the vibrobots? It's the vibrating motor. This kind of motor is explained and shown briefly here:


Basically, an offset counterweight in the shaft creates an imbalance which produces vibrations.
Of course this is a technical principle more than a scientific one, because this doesn't explain WHY an imbalance produces vibrations: if I remember well, this has to do with the speed at which the wider part of the shaft turns compared to the thinner part. The wide part moves slower than the thin part because any point on its surface has to travel a longer radial distance as they are farther away from the axis. Thus, the centripetal and centrifugal forces generated by that end of the shaft can not be nullified by the other end, resulting in a vibration (but you'll have to check all this with a more authoritative physics source).

Danny14333 years ago
why r 18
mad10000 (author)  Danny14333 years ago
I don't know if I fully understand your question, but the contest was divided in three categories. I won in the "above 18" years old category the "Simplest bot" prize.
thats simple and cool so i voted you on the nrw contest .
mad10000 (author)  keithosmarferrer4 years ago
Thank you!