FINAL DOCUMENT

Possible technical glitches

The screw motors amy withdraw more than 5A of current leading to burnout of the power transistors on the H-Bridge circuit if proper system for heat removal is not provided.

If using a USB to serial convertor for communication the circuit should be switched on before the convertor is plugged into the computer.

A delay has been used for switching the gearbox motor for allowing it to switch between "Land" and "Water" modes.This delay may vary from time to time.It is thus advisable to use current sensors to detect whether the gears are engaged properly instead of assuming a fixed time delay.
Cost

The total cost of the project was close to 20,000 INR , inclusive of the cost of arena preparation.The total budget approved for this project was 60,000 INR . In beginning we roughly estimated our budget hoping we would get the screws, gearboxes, bellows,etc made .But due to the fact that manufacturers disagree to give two or three screws, made up of UHMWPE, we made almost every system,the cost dipped .We used motors that were not as powerful as the ones we proposed because practical tests showed that there was no need for such powerful motors.We also did not use batteries as all of them were heavy than what was acceptable.

Inventory list




Sr.No. Item

1. Acrylic sheet 6mm


2 PVC pipes 70 and 90mm


3 Polypropellene rods different sizes


4 Aluminium L-Clamps



5 Gears 60mm and 30mm module1


6 GA sheet 0.5mm


7 High torque motors 100,30rpms


8 Long Scrwes


9 Air-tight plastic container


10 12V-5Amps Eliminators


11 Wiper Motors TVS-Lucas SW60


12 Nuts and bolts


13 Ball bearings


14 Fevicol SR


15 Anabond 666T silicone (gasket)sealant


16 PTFE tapes


17 Anabond 111


18 Glass fiberes and Epoxy resin


19 Rustoline


20 Spray paint


21 A water-proof membrane supposingly umbrella cloth


22 Aluminium Plates


23 Aluminium Strips 5mm thick


24 Polypropellene Sheets


25 Electronics



26 Big Plastic sheets of various dimenisons


27 Alum


28 Poster



[edit] See Also

* Archimedean Screw

[edit]
[edit] External Links

* http://thearcham.blogspot.com/2008/04/archimedean-amphibian.html
* http://www.shaastra.org/2008/Events/Archimedes
* http://en.wikipedia.org/wiki/Archimedean_screw