In the last picture you can see how the firing speed improved. After unscrewing the screw which is holding the plunger head you will be able to change the spring.Remove the collar and spring from the plunger (as shown in the third picture).Remove the 10 screws marked in the first picture of this step.Start by removing the orange plastic piece on the plunger.To replace the spring, follow these steps: I tried a 7 kilo spring in one, and although it was strong, it resulted in a lot of mis-firing. In my opinion, a 5 kg spring works best (the original one is a two kilo spring). When you use battery packs with higher voltage, it will increase the firing rate, but not the strength of the shot. I recommend changing the spring at this point, but that decision is up to you. I finished the whole tilt axis with just a fret saw and a cordless drill which was far too weak to drill the 28mm hole (I used the fret saw instead). Things like a scroll saw and a powerful drill are useful, but not a 100% necessary. Drill (3, 5, 12, 28 (to fit the bearing) mm drill bits).3 mm lead pearls or something similar as a counter weight.Optional: Paint and plastic primer for the gun.5 kg replacement spring for the Vulcan ( e.g.Servo for the tilt axis: Hitec HS-805BB. ![]() 15 x spax/wood screws M4 x 40 mm 4 x screws M4 x 16 mm.20 x 40 x 45 mm and 20 x 40 x 128 mm rectangular block of wood (you can also use the 1.5 mm plywood).Please do not attempt this mod unless you are convinced that you will be able to do it otherwise you might destroy your gun. But, I managed to accomplish this without removing the barrel, and I’m really happy with how it turned out! A big thanks goes to Bob who authored an awesome write up on how to build a sentry gun. It is really fun to see how these plastic toys turn grown men into small boys! My main aim was for it to look awesome which was difficult to achieve without removing the front part of the gun. So far, I’ve managed to infect just about everyone around me with the Nerf virus. ![]() If you've been browsing through my other instructables, you might have noticed that I am obsessed with Nerf guns. I had this project in mind for a long time and finally managed to find the time to bring it to life. As an added bonus, this gun won't fire at anyone wearing a shirt with the instructables robot on it. ![]() In this instructable, I will show you how to modify a Nerf Vulcan to automatically aim and fire at targets.
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