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Steel round bar

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Steel round bar

Unread postAuthor: daccel » Tue Dec 23, 2008 7:10 pm

Just had to share an awesome find.

It's a broken pin off an excavator. Dimensions are 1.75"x9". Some kind of hardened steel, not sure what exactly, hopefully I can track that down. And best of all it was free!

Time to start reading up on hybrids and get a tap/die set to go with my new drill press, me thinks. :twisted:
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Unread postAuthor: starman » Tue Dec 23, 2008 7:38 pm

Not sure you what you're planning to do with this piece...looks like a broken hydraulic arm. Maybe one heck of an ammo slug....
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Unread postAuthor: jonnyboy » Tue Dec 23, 2008 7:58 pm

He wants to make it into a hybrid.I think your better off just buying some steel pipe and use that for ammo.
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Unread postAuthor: twizi » Tue Dec 23, 2008 8:03 pm

if it is hardend steel wouldent be really hard to drill into?? and you want to make into a hybrid? you might need alot of drill bits
i would just use it for a hybrids slug that would do some damage :twisted: :twisted:



but overall very nice find
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Unread postAuthor: Hotwired » Tue Dec 23, 2008 8:53 pm

There's a very good reason you do your machining before hardening the steel.



I have a small pile of ruined hacksaw blades intended for metal which failed miserably against what only appeared to be a brass lock bolt.

Needless to say it wasn't just a brass bolt and hacksaw teeth were all over the floor.


One of these days I'll get that door open.
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Unread postAuthor: skyjive » Tue Dec 23, 2008 8:55 pm

get some fins, a sabot, and a 4" barrel :D
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Unread postAuthor: raptorforce » Wed Dec 24, 2008 12:13 am

nice all you can buy is weldable steel

does any one know what kind of steel is used for nails like the big ones
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Unread postAuthor: cheeseboy » Wed Dec 24, 2008 12:40 am

raptor force please search, I found the answer on a quick Google search. depending on quality steel nails can be made of standard stainless (10% chromium) or high quality tool steel (1.0% carbon, 5.0% chromium, and 5.0% molybdenum).
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Unread postAuthor: daccel » Wed Dec 24, 2008 3:05 am

It was a pin that held a thumb on the arm, but maybe it was from a hydraulic cylinder originally, I'm not sure. Apparently there was a regulator missing and the pressure was too high, which is how it managed to shear through almost 2" of steel :shock:.

Did a small test drill this evening, it doesn't actually seem that hard, so it should be workable.

As much as I would enjoy seeing what a slug this size could do, I'm more interested in small launchers. If the low x prototype I'm working on is successful, this will likely turn into version two of a bolt action cartridge hybrid.
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Unread postAuthor: raptorforce » Wed Dec 24, 2008 3:06 am

cheeseboy wrote:raptor force please search, I found the answer on a quick Google search. depending on quality steel nails can be made of standard stainless (10% chromium) or high quality tool steel (1.0% carbon, 5.0% chromium, and 5.0% molybdenum).


how would you know which one the nails were like 1.60 so i don think there high quality

does anyone know a good way to make a sabot round for a nail to fit a 3/4 pvc pipe.

doesn't have to be sabot just anything would work as long as its efficient powerful and uses basic wood working tools as i have no fancy stuff
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Unread postAuthor: psycix » Thu Dec 25, 2008 7:39 am

Now thats one awesome rod you got there.
If its workable then a hybrid chamber would be awesome.
Besides, for a perfect projectile, you dont need massive steel. You need a core of lead to increase the weight, and a hardened steel tip at the front.
Massive steel is heavy, but massive lead is even more. And lead can be molten easily.

If its hardened, may by you could heat it up and cool it down on the proper speed so it becomes machinable. Later on, you can always harden it again.
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