Permo Posted July 3, 2018 Posted July 3, 2018 "KILLROY" Autonomous robo sniper. Inspired by this google search; https://www.google.com/search?q=autonomous+military&client=firefox-b&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjv_5XK94LcAhWJM-wKHVm3BEsQsAQIKQ I wanted to build something autonomous styled that does not look like a tank too much, the main design being about "effectiveness" I've been experimenting with a pneumatic Lego gun for a while and got it to shoot quite a nice distance with some tinkering and added a laseraim system to it with quite good results, killshot after killshot. It is powered by the standard PF system using 2x V2 and 1x V1 IR receiver on a third party 11.1V LiPo battery, wich is housed in a Lego build batteryholder. It has a fair bit of power by 4x L motor on portal hubs driving the sprocket wheels, 2 per side, it is quite fast and has a lot of torque and climbs steep hills with no problems dispite it's weight being 2100 grams. As you might notice I put bits of neoprene selfadhesive tape on the tracks, on my first testrun I was unpleasantly surprised how loud this thing was on my laminate floor, oh my, the next day my downstairs neighbour asked if I was sanding the floor lol... "No, that was just a tank" It also improves grip on a smooth floor and protects the tracks from getting scratched. The gun has remote tilt and rotation wich is very slow / geared down using wormwheels so it allows for very accurate aiming, movement is limited by the cables and hose running to the gun from the chassis but it's range is large enough to not have to worry about it. The laser fires from the same controller as the actual airgun, so take aim first, pressurize the system, and launch... and hit. The gun really improved when I got 16 of these barrel parts from a brickstore, these allow for a nice strong and straight airtight barrel. Also the airswitch has to sit directly on the servo, adding a mechanism to it to correct for 90° rotation of the servo compared to the 45° of the switch will render it too slow and you'll get a pffffffffffffffffffffffffffffffffff instead of a puff! ... having it sit directly on the servo is no problem though as the servo autocorrects it's position when it gets stalled. Some inside structure; It can deliver a 60 psi punch ! This is Roy... He's dead now.... I wish I had a cat.... Quote
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