The only previous "experience" i have with combat robots are all my 1kg RC lego battlebots (featuring witch doctor, carbide, pulsar and killerhurtz replicas, you can find a bit more on my yt and twitter), and i first wanted to build a rubber-band powered flipper, but the mechanism would become too complex to be realized with the means i have (a dremel, electric solder, handdrill with points till 3.0mm and a site where i can order 3dprints) so i decided to start a 9kg crusher bot.
the original idea was to have a full iron and and a winch mechanism powered by a 1000:1 pololu motor, to have some great crushing power, but then i read that those motors will break on stall, meanwhile i was choosing the final shapes i've built some test chassis since my ant will be arduino powered and i need to code it, here the first result:
![Image](http://www.brickshelf.com/gallery/PKW/Sumobots/antcrush/ant1.jpg)
that was a good one but with grabber-grade power, also the 6.0v voltage regulator i was using for the servo has a a minimum input voltage that will make the servo die even at 60% battery charge, and that wasn't good, so i ordered some 3D prints and build the real main weapon (with a 298:1 motor):
![Image](http://www.brickshelf.com/gallery/PKW/Sumobots/antcrush/ant.jpg)
size comparison:
![Image](http://www.brickshelf.com/gallery/PKW/Sumobots/antcrush/ant2.jpg)
small vid with half charge AA batteries (more than double the power with the 7.4v lipo):
https://twitter.com/PKW_ITA/status/845365706216685568
but then something bad happened, i assembled drive together again and i start testing an iron point but the arm got stuck, i've found that winch axle wasn't really aligned and this (on stall) caused a gear tooth to break, also the motor itself stop randomly also during no load and no geabox rotation so i just gave up with the idea of the motor powered winch...
last image:
![Image](http://www.brickshelf.com/gallery/PKW/Sumobots/antcrush/ant3.jpg)
so then i really need your help, what i want to do is to find a good moddable servo (at least 5kg*cm) to use in place of the motor, if a 7.4v tolerant i'll just use the servo motor and remove all electronics, if there will be only 6.0v tolerant then i want to use servo electronics and solder the arm potentiometer to is, use my 6.0v regulator and at leas have a sort of lipo/wepon cut-off on low battery power.
what do you think? THANKS in advice!