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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).


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 
 
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:

http://www.namiki.net/product/vibration/motor/tech.html

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).

Regards
Danny14334 years ago
why r 18
mad10000 (author)  Danny14334 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!