Engineering project

microbiek

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

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.

marco murphy

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

WHat about ordinary level, the tractor. Any ideas?

microbiek

thanks sean

im...LOST

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

It just has to be released periodically.

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.

james_abbeylad

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

Thomas_S_Hunterson

james_abbeylad wrote:

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

Eh google

And you should be doing your homework yourself!;)

JackKelly

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