Instructables
In this Instructable, I will show you how to make a grenade from 2 halves of a knex ball(sold in the 250 piece set with 150 bonus parts, and maybe some others, but this is where I got it ), and a spring. I got mine in a nerf gun. Also, a red rod will be helpful.
Let's get started!
 
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Step 1: Assemblance

Picture of Assemblance
The red rod is just here to help, you don't really need it, though it is fairly difficult without.
Also, shrapnel may be added, just put it vertically so All the shrapnel won't fall out of one of the halves, then press the two halves together.

Step 2: Done!

Picture of Done!
Wowie! We're done already! To detonate just throw it. Please don't be harsh. This is my first instructable, and I hope you like it!
Whaleman6 years ago
Nice, I had had this Idea for a long time, but no spring that would work =(
i got mine from an old game cube turbo controler
Me too :( Only elastic bands.

If you have a spring donation then please post it to ..18 Sodsbury Terrace, Hooverhampton, Bingoland.
Bingoland, eh? Can't say I've ever heard of that place before.....
It is also known as Mecca :P
Ain't that where Muslims are supposed to face when they prey five times a day?
Prranavan5 years ago
It is good but if you fill the inside of the ball with blue spacers and green rods, it will be a lot better
i did that too:)
eneergcam5 years ago
i thought of this when i was like 10.
Nice idea. I would like to try it but i have no ball, what set do you get them from?
u can get it from the "BIG BALL FACTORY" set
you can get the ball pieces in the wind up motor set with a red small bin. theyre kinda easy to find so I think you wouldnt miss it in the toys section.
Bradley1000 (author)  Mr Tenacious6 years ago
I said in my intructable where to get the ball, It comes with the 250 piece set with 150 bonus pieces. I found that set on amazon.com for about 20 dollars.
jakesllama6 years ago
great now all you need is a GRENADE LAUCHER!!! good work
build this http://knexinnovation.net/forums/viewtopic.php?f=49&t=157 but please know that this is not mine
andrew136 years ago
Now fill it with airsoft BBs and its an airsoft grenade!
dude this is sweet! I came across an idea that instead of picking up all the scattered pieces fill with baby powder. im doin that this morning
yeah, um it detonates for me as soon as it leaves my hand! maybe i've used it to many times. Its awesome though! +1
xero16 years ago
not bad nice idea
altaria19936 years ago
finally a good use for those darn balls :D
AHEM... Ball machines...
i ment in a way of arms and stuff :P
True. You could always launch them with a giant cannon...
i was thinking about that too :P
nerfer1926 years ago
you sould fill this with airsoft pellets
Simple, but it actually seems to work... impressive.
wtf
nerfer1926 years ago
sick idea but i dont have the right peices :-(
go to knex.com for the ball
KILLERK6 years ago
SR-v1 coming soon!
Pax4156 years ago
Cool instructable