Hi ... Im a Engineering Student and im currently working on a project involves very tiny robots ..
i want to know what kind of mechanism they used in here ,in these robots ...
Please watch this video ... VIDEO
Does Anyone know what kind of mechanism used to walk these robots ???
(deleted)
They look to use tiny servos in the body or something less than servos that moves stop to stop.
If you have 2 button magnets with a N-S gap between, a coil in that gap would jump to either side depending on which direction current was run through it. Over short distances it will be strongest. The legs are just lever arms....
spycatcher2k:
Micro Servos possibly.
Very micro 
...R
Those things are inches long. They look like flies but they're closer to chicken egg dimensions.
The "servos" still need to be very small because there must also be space for a battery and a microprocessor and maybe a wireless receiver.
...R
(deleted)
ESP8266 modules are tiny, have a 32-bit processor with 8 pins and wifi.
How big a battery to run how long? Not very big = not very long.
A servo needs to be able to move to and hold a position. Those legs don't. The driver can be simpler.
Feet that slip forward but hold to push when moved back..... or move in ellipses higher on the swing forward. It might be possible to drive each side with 1 motor and some mechanics. Watch Ralph Steiner's old short feature movie on youtube for inspiration.
Hi,
I'd say they are nothing like servos, the action is tooo fast.
Just three possibly two motors/solenoid pairs that pull an armature left and right.
No feedback required, no mid range positioning, just hard left or hard right.
Another Helipal video
I have a couple of the servos that @spycatcherK2 has, nice little units.
Tom...
A very short solenoid could accomplish the move close to a pivot.
spycatcher2k:
Used these for points on a model rail layout.
I have come across those, but I don't reckon 6 of them would fit in one of those 'bots
Just thinking some more ...
While I don't think even 6 of the motors from the little servos would fit in one of those bots they might form the basis for an interesting challenge to make a slightly bigger bot that works much the same?
Or, put another way, what is the smallest similar 'bot' that could be made from readily available parts and a 3D printer?
...R
As a supposed engineering student, you might first imagine something as simple as a motor and a cam system. 2 DC motors with nubs on the shaft are all that are needed. The toys move very obviously like cars that are divided left side and right side wheel control.
The rest of you folks surprise me. Tsk.
INTP:
As a supposed engineering student, you might first imagine something as simple as a motor and a cam system. 2 DC motors with nubs on the shaft are all that are needed. The toys move very obviously like cars that are divided left side and right side wheel control.
The rest of you folks surprise me. Tsk.
Hey were are all thinking outside the circle... (Or is it square? ? ?).... :o
The leg movement is more like;
Front and Back on left side working with Centre on right side.
Front and Back on right side working with Centre on left side.
Tom..
INTP:
As a supposed engineering student, you might first imagine something as simple as a motor and a cam system. 2 DC motors with nubs on the shaft are all that are needed. The toys move very obviously like cars that are divided left side and right side wheel control.
The rest of you folks surprise me. Tsk.
That did cross my mind but I don't think it is so simple. I think the legs on one side must move as a single and as a pair so I suspect a minimum of 4 motors is needed.
...R
It clearly operates like a tank. Each side can be operated forward or backward.
It either moves forward, backward or spins.
I like the 2 DC motor conclusion.
vinceherman:
It clearly operates like a tank. Each side can be operated forward or backward.
It either moves forward, backward or spins.
I like the 2 DC motor conclusion.
If you look closely the 3 legs on one side do not always move in unison.
...R
INTP:
As a supposed engineering student, you might first imagine something as simple as a motor and a cam system. 2 DC motors with nubs on the shaft are all that are needed. The toys move very obviously like cars that are divided left side and right side wheel control.
The rest of you folks surprise me. Tsk.
Try reply #7
"It might be possible to drive each side with 1 motor and some mechanics."
And nobody +1'd Steiner's short film, Mechanical Principles.
If I but a button magnet on an axle that's perpendicular to the magnetic poles (the faces) and free to spin then wrapped 2 coils around that so they cross at/around the axles then powering one of those coils will cause the magnet to turn and align itself with that coil, and it will happen quick. Other coil gets the current, magnet will turn to align with that coil. Both coils result in a field that points to neither. That motor can be quite compact and may already be patented.
Robin2:
If you look closely the 3 legs on one side do not always move in unison....R
1 motor doesn't have to move the legs on just one side.
There is no apparent speed control, very much a forward/stop/backward for each side. Except it doesn't even allow one side to stop while other moves, to get an additional degree of turning ratio. Stop is synchronized. This would allow the sides to always be in sync as far as 2 outers on one side working with mid of other.
So really, the only motion it is capable of is forward, backward, turn left, turn right, and stop.
The turns will always be the sides running opposite, never a one-side-stop situation.
The turns I see are all one set of legs running faster than the other. I don't recall any spin movements or backing up.
If 2 motors move 2 legs on one side and 1 on the other, running 1 motor faster than the other will make the bot turn.