Step 6: Trigger system

This is the trigger system. It is relatively complicated, probably the most so on this cannon. It has to be able to hold a great deal of weight in two stages. First, while you are loading, the elastics are wrapped around the red rods at the back, so the must be very secure. Once the bullet is at the back and locked in, all the elastic pull is put on it, so it too, has a very secure holding mechanism. It is released by simple bulling back the large knob on top. If you didn't get that, don't worry, there will be better explanations later on.

This step has been split up into a few smaller substeps for your convenience.
1: What you are about to make
2: Build this little part
3: Then make this
4: Another view of that thing. There are blue spacers on every yellow rod
5: A view from the bottom. Make sure that all the rods are lined up
6: Build this
7: And tape it up. Make sure the tape is not obstructing the hole
8: Make this little guy
9: That thingy upside-down
10: Another view....
11: A view from the back...
12: From the top...
13: Add the pin to that weird thingy with a blue rod and a blue cap (can be tan)
14: Put the handle on top
15: A view of that connection. Make sure all the rods are lined up and attached in there correct places
16: Put it on that thing you made first
17: Now make this. It is the upper part of the back of the slide
18: A view of the end
19: And from below
20: A view from a different angle. Remember the whites on the end
21: The lower back slide. Prettymuch the same
22: A view from the end
23: A view from an angle again
24: The biggest chunk of this mechanism. Your about to make it
25: Make this back part. Remember those pieces inside
26: A view of the back of the back part
27: Looking inside it for a better view
28: Looking inside the top for a better view of that
29: the other part of the main mechanism. There are blue and white rods on all of the yellow connectors.
30: Just so you can see that
31: A close up of the front
32: A close up of the top (upside down)
33: The top from the back (still upside down)
34: The bottom (close up and upside down)
35: Just so you can see the whites
36: The back part and the main part
37: And that connected. Yay!
38: Added the knob thingy
39: Added the bottom slide...
40: That connection....
41: Added the top slide
42: And a close up of that connection
43: Looking down that barrel
44: Add an elastic on top. It should only be strong enough to pull the knob all the way down, no more.

Sorry about that step being atrotiously long. Lol.
<p>im ordering the parts to make it</p>
<p>Aint nobody going to rob my house tonite!</p>
<p>Very nice cannon. I bet very few people have the pieces to build it. Since I build ball machines, though, I most definitely have enough.</p>
<p>This inspired me to building on instructables</p><p>I dont have NEARLY enough peices though. not even enough to make the handheld one</p>
<p>add a white rod to the front of the shell to make it more aerodynamic. Also, DEFINITELY USE IN KNEX CTF.</p>
<p>yes they are</p>
I love this gun i made this gun about 3 months ago and already i demolished a plant pot,exploded my knex box and a solid piece of wood!?? Best thing I've ever made
<p>reading the comments i'm not so sure if it's safe to build this thing...</p>
<p>Don't worry about that, it is very safe. As long as you be careful, because of it's structural integrity you will be fine. It's scary at first, but don't worry about it, just go ahead and do it! =D</p>
<p>I'm not worried about destroying something i'm worried about breaking my knex pieces XD</p>
<p>I built this at a friends house over the holidays, fired the first shot which promptly went through a window, had to take it to pieces again :( </p>
<p>Pretty much tripling the size of this, and it is HUGE, and it is almost done! =D</p>
<p>Screw rubber bands! I use surgical tubing! IT IS INSANE, FOR I HAVE MADE A BIG MOD. &gt;=) It shoots around 200-300 feet... I need more blocks of wood, nuff said.</p>
<p>Here is a pic of the one i built from this instructable.</p>
<p>I just finished this build and love it!</p>
Who has built this cannon yet? If anyone has built this yet please put a pic up.
I built it years ago. I have a picture somewhere but on a different computer.
It is so amazing how you can just sit down and make this from scratch... or your imagination.... but imagination sounds wrong...
Cheers my friend :-) My origional ideas generally need quite a lot of refining before they are presentable though..
Well, it does feel good to sit down with your K'nex and make something from scratch and get it right the first time.
Certainly, but for me at least, that doesn't happen often.
I gonna build this thing and i have al de peaces, i am sure of that. But i don't no what he meens with the light and grey connectors and te tan cap things. Please help me somebody. With pictures is the handiest.?
Wich part do you meen with the tan cap, the light grey connectors andvthe dark grey connectors???
I wanna build it as its epic but I haven't got the pieces
who has has built this cannon yet?
In the parts list you havent included white connectors? Hom many would i need?
Ahh, I always miss something.. My guess would be around 20 or 30.. If you have enough yellow and 3d connectors, you WILL have enough white connectors though I am certain.
how smart are you
Same I'm on this step
My fingers are killing me right now
Wow, cool gun! I am going to build it sometime soon if i have the pieces, -_-. 5 Stars!
Cheers! Let me know if you do end up building.. Best of luck!
I am going to build it sometime when i count and inventory my K'nex pieces so i know how many of every kind of piece i have so i can figure out if i can build things a lot faster.
almost finnished with this gun i am still building the trigger though this gun is heavy
arent red and tan rods the same thing?
No, the tan rods are reinforced versions of the red length rods.
its like a MORTER
i doubled the size....
Photos please!
photo six on step 6: most difficult peice on the planet to build XD
Ah, the good old days. You know, I think I still have a chunk of this monster's trigger mech laying around almost 4 years later and I've not yet found the need or motivation to try and break it up.
Thats awesome :-p I know the feeling. <br> <br>I'ma build another one sometime.
I look forward to seeing it!
This is awesome! 5 stars.
I built a cannon that is similar to your cannon.

About This Instructable


100 favorites


Bio: K'nex is my thing!
More by I_am_Canadian: Knex Ball Machine Element - The Elliptica Turnabout - A K'nex windmill Knex Ball Machine - TurnPike
Add instructable to: