Look No Batteries
Due to the recent interest in oddbots competition what follows are some ideas to help.
I was given a robot (tin-clockwork) recently - which drove forwards for 10seconds on one wind, which got me thinking about an old wax and rubberband Motor i used to make.
So i adapted it to a 10cm tall papercard robot and by winding it up 50 turns it will turn for over 5 minutes - longer than most batteries :-)
Please Note - the Videos are not time lapsed animations
At the end of the first Video you can see him walking.....
Showing Robot version 2
Now with ability to rotate both arms independant of each other.
Very Silent Motors.
(higher quality video).
Not so silent when he cracks his head on the piano.
With a trusty "Swiss Army knife"
the pieces are cut too precision.
Glued with stickglue - not exactly too precision.
Fill the hollow arm rings with wax, making sure the wax forms a bubble like thingy pround of the top.
Then make a hole through the center of the wax and card.
An Elastic band is passed through arms and shoulders and secured with a cut ear-cleaner stick.
You can also see for this model i also threaded the elastic band through a drinking straw - which gives the chest more stability - and you can wind it up a lot more without squashing the ribs and leaving the robot breathless.
Laughing his head off......
Next wax Joint is the Hip joint.
Just drip wax and build up a layer 2-3mm thick.
whilst it is still a little warm but set - turn it up side down and flatten it on the table - just so that the surface is a flat as possible.
Using Keyhole surgery - as we all have multimeter probes .....
the elastic band can be pulled through the whole model.
Details of hip joint.
I have now found out that if you make the top surface out of PolyMorph then it gives a much smoother drive.
Secure his spine elastic-band.
arrange it so it cannot rotate.
Robot complete ready to be wound up and let loose.
The Robot allowed me permission to make a full body X-Ray just to check to see if everthing was in the right order........
As i layed him on the keyboard (operating table) he raised his arm over his head -------------as if to say "Goodbye World"
+""*ç%&/&/()))== - Flash...................................
The Xray plate shows the positioning of the Elastic bands and Wax Joint.