axes in a small space (and weight)

hey guys, i am building a new 4wd feather, and i remembered how weaponless feathers are fowned upon by some peoples so i wanted to add a basic weapon. thought about doing a lifter but decided against it, i decided on an axe/hammer.
i want to mount the whole motor gearing and axe on the top of the bot so i can put a polycarbonte surround on bits that need it. im looking for a fairly cheap not to power hungry system for this to swing a 2kg axe. ideally it has to fit on a 25 by 40cm rectangle and be under 3kg.
the layout of my robot is like this but with another 2 motors the other side and another battery pack.

http://i947.photobucket.com/albums/a...uin/003-37.jpg
thanks very much

http://www.robowars.org/wikka/ElectricAxeWeapons

thanks, ill have a look in to that

How about using car fan motors instead of the scooter motor?

Also, what's the easiest system to build where you have a on/off switch which activates the system where an axe fires and returns in series without any other input?

micro switch check out my vid for it http://www.youtube.com/watch?v=cDLGGTpE7Cw

cool. thanks.

can car radiator fan motors be reversed?

yes

Anyone ever tried a friction drive axe?

Quote:

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Originally Posted by Danjr1

Anyone ever tried a friction drive axe?

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Having used friction drive on a feather I'd say they do work but you'd be looking at a real prcision piece of engineering to make it work consistently and reliably.

Belt or chain drive would be far easier to achiev and probably more reliable. They would also be cheaper.

Andy