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hi,yes axes are ineffective, you cant really get somthing powerfull enough to do damage in the 150g weight limit...i tried a pneumatic axe one, was awsome and made nice holes...but left me 9 grams for drive, wheels, armor batterys etc (basicly all the electronics) that being said however it can still give you a nasty cut if it hits your finger (i know from experiance) and it does encourage the judges to give you the damage/aggresion marks if you have a sort of "Active weapon" rather than just a plain old rambot...and yes, it does have a shell, its made of polycarbonate and titainium, you can see it slightly in the top of the frame for most of the video, and then you can see it fully towards the end when valliant pushes it around a bit id like to show you a picture but unfortunetly im about 400 miles away from the robot on holliday :/ will put one up when i get back...jackhttp://teamorr.com/
i actualy had a walking robot for a bit... (those are the legs) it had a brushless spinner for its weapon...however like most walkers it was quite unstable/slow thus i prefer wheels...however i am thinking of building a gyro-walker (the disk gets pulled left and right by servos and move the feet)...best seen here: Maker Faire 2010 Day 2: Warpig vs Gyrobot FINAL it looks quite good...and should still be entitled to the weight bonus the main point of valliants axe was simply the joy of having a moving weapon (it was back when i first started) and to perhaps swing the fight with the judges if we were against another rammer, its main weapon was really it's pushing poweri have a few really good sponsors, (that can be found on the sponsors page of my website wouldnt ya know ) including a cnc milling company and a plastic providor (which i still have to put on the site *mental note to self*) however most of the robots i finance myself, my father helps out where he can but usualy its me who puts in the cash/finds what parts are best. a summer job really helps! ^^jackhttp://teamorr.com/
i don't know how i like the idea of using servos and microswitches in the last video to control a robot when one could just use a microcontroler to read the output from the controler