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Engineering project

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  • 24-10-2006 8:41pm
    #1
    microbiek
    Closed Accounts Posts: 93 ✭✭


    i just got my engineering project a table tennis serving machine anyone got any ways of making this you can only use a 9V battery and it has to hold atleast 10 balls and you need an electronic indicator to show when all the balls have been fired..................Just need a few ideas


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    #2
    Thomas_S_Hunterson
    Closed Accounts Posts: 6,151 ✭✭✭Thomas_S_Hunterson


    For the propulsion end of things::::

    Balls are fed from hopper, into a channel just long enough to accomodate then.

    Inthe channel, there are two wheels either side being spun by the 9V motor in opposide directions, such that when the ball reaches them, it will be propelled forward at speed (to do this, the wheels should probably be coated in ruber so as to accomodate the roundness of the ball and to fit it snugly.

    The ball should be shot from the end of the channel which is aimed just right to make it bounce on the table, or whatever way you wish.

    Hope i explained that OK.


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    #3
    marco murphy
    Closed Accounts Posts: 3,715 ✭✭✭marco murphy


    Ive seen that idea a times sean. It sounds concrete enough.

    WHat about ordinary level, the tractor. Any ideas?


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    #4
    microbiek
    Closed Accounts Posts: 93 ✭✭microbiek


    thanks sean


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    #5
    im...LOST
    Registered Users Posts: 1,784 ✭✭✭im...LOST


    Note that it does not actually say that te ball needs to be shot out.

    It just has to be released periodically.


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    #6
    dingding
    Registered Users Posts: 4,931 ✭✭✭dingding


    Can you put a switch which measures when there are no balls left. or some sort of photo sensor, this could light a LED via a transistor.

    A table tennis ball iw white and would reflect light, where as no table tennis ball would not reflect any light.


    Look at JA26D on Maplin, this combines the light source and reciever.

    Full size sketch here.

    http://www.radioandtelly.co.uk/shop/Photo_Reflector_SY-CR102_6354/Photo_Reflector_SY-CR102_6354.htm


    This project might give you a good starting point.

    http://www.jeffree.co.uk/Pages/speedmeasurement.html


    Would agree with Sean regarding the spinning wheel to drive the balls out.

    :)


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    #7
    james_abbeylad
    Closed Accounts Posts: 1 ✭james_abbeylad


    amcan any1 help me on the basic design????


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    #8
    Thomas_S_Hunterson
    Closed Accounts Posts: 6,151 ✭✭✭Thomas_S_Hunterson


    james_abbeylad wrote:
    amcan any1 help me on the basic design????
    Eh google

    And you should be doing your homework yourself!;)


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    #9
    JackKelly
    Registered Users Posts: 3,225 ✭✭✭JackKelly


    em, I'm pretty sure the point of these is to do them yourself and not have other people give you the answer.


This discussion has been closed.
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