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Thread: Techfest 2005 - prototype design example

  1. #1
    Administrator T-1000 vikas's Avatar
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    Default Techfest 2005 - prototype design example

    Hello

    I read the techfest specification and as i can not take part i thought why not help

    others .
    So here is the first prototype design for the competition ( By me )...

    About the design

    The objective is simple ( fast , high mobility line following robot )

    So here is somethings about the design ...
    - The robot is all aluminium
    - The wheels are inflated and have an circumfrence such that no part of robot touches

    ground in any way ( So when it jumps the wheels take the shock ).
    - There are four aluminium plates which make up the structue to which the Gearing ,

    motors and overall robot is attached , The batteries are also shown ( seprate for uC

    and motors )
    - The 4 aluminium plates will be held together by steel rods .
    - The robot uses diffretial drive for motion ( very high on mobility )
    - Line sensing part can be mounted on bottom of one side . ( even if it flips you are

    given time to touch robot before the autonomus round )
    - The gearing ratio is provided to be powerfull yet fast ( I had one such in my robots and its quite fast enough ) .
    - Motors can be simple power ful DC motors .
    - a simple mechanism for handling the blocks will soon be coming up ( next design ... any suggestions )

    Here is the design ....


    You can also download the movie ... [ http://www.roboticsindia.com/public/...riki/robot.avi ]
    - movie is in DivX 5.0.1 codec

    Also here are the Direct X model files ... [ http://www.roboticsindia.com/public/...riki/robot.zip ]


    Hope this help

    Vikas

  2. #2
    Member Advanced User
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    Default my design ideas :D

    i was thinking something similar...

    there is a guy who provides belts for belt drive.. apparently very good...frm mumbai...

    i think belts wud be better than gears as they will handle shock better

    inflated tyers and springs (lots of them) will be good.. what say?
    . was also thinking of having this thin sheet of plastic or cloth at the top which acts like a parachute...
    dunno how feasible

    tell what u think..

    mandar

  3. #3

    Default Vikas

    Yes
    belts will be better if you find good ones . about parashut ( for 1 m ) not siutable ....

  4. #4
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    Default

    hey... for differential drive how do u achieve turning..
    only 2 things come to my mind.. motors and electromagnets
    have got an idea for electromagnets.. chucking extra motor idea due to wt constraints,...
    heres how elec-magnet works... when u switch it on, a gear is pulled away frm its position disengaging it and so one side of wheels stops moving...
    when switched off, a spring puts the gear back in place

    found a ring shaped electromagnet on solarbotics.com .... gives 1 milihenry field... is it enuf?... well there are nice soft iron cores also available.. they might be useful too

    what say?
    mandar

  5. #5
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    Default

    a differential drive works just like a battle tank.

    suppose u want to move right,u stop the right side and move the left drive forwards.----or-----u can move the right drive back and left drive forwards.

    Differential drive is preffered for robots,because u get exact or around "ON the central axis" turn with little or no turning radius.

    U don't need to disengage ur motors from the drive fo rthis type.
    Though u can use ur ides if u wish to gear down or gear up[just like an ordinary vehicle]
    liked ur idea anyway ,mandar,

    -ice
    //gerry

  6. #6

    Default Design

    Nice design dude!

    How did u make it so quickly ? What software.. some tips please...

  7. #7
    Administrator T-1000 vikas's Avatar
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    Default ok

    Ok daaBrat Ill be soon posting an article to how to make 3D models for what you have in Mind .

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