Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 67 users online :: 5 registered, 0 hidden and 62 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Penetrating 1/4" plate steel

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

Unread postAuthor: thespeedycicada » Sun Sep 23, 2007 10:16 pm

you might need a little more power than 2500 ft/lbs even with a harder projectile a supersonic hybrid perhaps?
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: cdheller » Mon Sep 24, 2007 3:51 am

http://www.ramset.com/fasteners_powder.asp

ramset might have the tip you need.

they are made for penetrating into concrete and steel using a .22 blank pushing on a 3 or 4 in plunger.

tough metal , relatively cheap , already proven to work

1/4 and 3/8 threads to screw your sabot body on

[/img]
  • 0

Attachments
9100_thread.jpg
9100_thread.jpg (15.73 KiB) Viewed 561 times
1600_thread.jpg
1600_thread.jpg (30.81 KiB) Viewed 561 times
Last edited by cdheller on Mon Sep 24, 2007 4:44 pm, edited 1 time in total.
User avatar
cdheller
Donating Member
Donating Member
 
Posts: 126
Joined: Wed Oct 05, 2005 5:30 pm
Location: Austin Texas
Reputation: 0

Unread postAuthor: DYI » Mon Sep 24, 2007 3:47 pm

Although I would rather save this for when I actually post the launcher, it is large bore (by my standards), and is capable of muzzle energies upwards of 3500 ft/lbs in its current configuration, possibly over 7000 ft/lbs with a larger chamber and barrel. I am building a finned steel round now, made out of 1/4" steel rod which I will harden using _Fnord's method. If that doesn't work, I'll have to find some carbide or tool steel.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: dongfang » Mon Sep 24, 2007 4:50 pm

Hi,

How about just drilling a hole in front of the re-bar, and sinking a hardened tool, like a mandrel or a sharpened, good quality Phillips screwdriver bit, into it?

Regards
Soren
  • 0

User avatar
dongfang
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 448
Joined: Sun Aug 27, 2006 8:02 am
Location: Switzerland
Reputation: 0

Unread postAuthor: Matheusilla » Mon Sep 24, 2007 6:00 pm

How about a large center punch or a cold chisel? You could even sheath a large drill bit into a steel pipe or solid rod. Just leave the drill shank sticking out and sharpen it to a point.
  • 0


Matheusilla
Sergeant First Class
Sergeant First Class
 
Posts: 140
Joined: Tue Feb 13, 2007 7:43 pm
Reputation: 0

Unread postAuthor: thespeedycicada » Mon Sep 24, 2007 6:35 pm

you can get big tungsten slugs off e-bay for cheap (well at least for tungsten) that should do it with a hybrid at least.
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: DYI » Mon Sep 24, 2007 6:43 pm

There is only one hybrid that I know of that can achieve a higher muzzle energy than this gun, and that is Killjoy's FEAR. I don't have the facilities or money to build a hybrid that could equal or exceed the power of this launcher, or even come close.

I may not even be able to order anything from eBay, since I don't have PayPal, and can't get it.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Sponsored

Sponsor
 


Unread postAuthor: thespeedycicada » Mon Sep 24, 2007 7:57 pm

why dont you try an actual bullet its probaly not that much better than what you were doing before but its worth a try.
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: Killjoy » Tue Sep 25, 2007 1:35 am

^Unless its armor piercing at best it will just dent the steel plate, the copper and lead are just to soft and steel rounds will just smush like the rebar.

And DYI if I lived in canada I could have loaned FEAR to you. All this talk though is giving me the urge to try out armor piercing tests with FEAR.
  • 0

Stanford Class of 2012

"In the end our society will be defined not only by what we create, but what we refuse to destroy"- John Sawhill

Killjoy
Brigadier General
Brigadier General
 
Posts: 1053
Joined: Sun Nov 12, 2006 12:51 am
Location: New Mexico
Reputation: 0

Unread postAuthor: SpudBlaster15 » Tue Sep 25, 2007 1:57 am

Your best bet (with access only to readily available materials) is going to be a near point blank shot with a small diameter, saboted dart made from high carbon steel. The tip of the dart should be tapered to a gradual point. The dart should then be hardened by heating the steel until it is glowing red, then immediately quenching it in cold water. The result will be a very hard but brittle projectile. Upon impact, it may simply shatter, so you will need to temper it. Bring the steel surface down to bare metal, then slowly heat it. You will notice that a blue ring appears, and moves down the dart as it heats up. When the blue line reaches the opposite end of the dart from where you began heating, turn off the torch, and allow the dart to cool slowly. The resulting projectile will still be hard, but it will also have a degree of elasticity that will allow it to pierce the steel plate without snapping into several pieces.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: thespeedycicada » Wed Sep 26, 2007 10:42 am

Killjoy wrote:^Unless its armor piercing at best it will just dent the steel plate, the copper and lead are just to soft and steel rounds will just smush like the rebar.

And DYI if I lived in canada I could have loaned FEAR to you. All this talk though is giving me the urge to try out armor piercing tests with FEAR.
thats what i mean you may be able to find armor pierceing rounds that are inert somewhere or you could make a saboted tungsten dart out of this it seems to be near pure and it comes in small packs toohttp://www.uniweld.com/catalog/alloys/tungsten/tungston_main.htm
  • 0

current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: DYI » Thu Sep 27, 2007 5:18 pm

Pure tungsten is dense, but it may not be hard enough for this purpose.

@Killjoy: I'm surprised you havn't tried this already with FEAR. I'm working on the dart in my tech class now, because we're essentially free to work on whatever we want there, other than actual weapons.

@SB15: thanks for the tip on tempering the steel. It should come in handy in this project.

I have yet to find anywhere in Canada where I could by carbide / tool steel rods, so I guess that is out of the question.

Didn't _Fnord almost manage to shoot through 1/4" steel plate with his giant pneumatic?
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: Fnord » Thu Sep 27, 2007 5:23 pm

Oh yeah, I did! (almost)
I totaly forgot about that.
When I shot with my BGP, it punched a dent that was very close to cutting through the plate, but that was with a big blunt piece of 1/2 inch pipe, not a sharpened armor-piercing round.
  • 0

Image
User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: st.croixsurfer » Thu Sep 27, 2007 5:33 pm

may i suggest some sort of magnetic explosive round :twisted:
  • 0


st.croixsurfer
Specialist
Specialist
 
Posts: 42
Joined: Thu Sep 27, 2007 4:48 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Sep 27, 2007 5:33 pm

I don't see a problem with using steel to penetrate steel - before the invention of the tank, the world's navies had been lobbing steel sheels to penetrate steel ships for decades. Also, it's only well into world war 2 when muzzle velocities started to exceed 4,000 feet per second that it was found that steel shot was shattering and designers turned to harder materials like tungsten carbide.

One idea you might borrow from shell design is to "cap" your projectile with a softer metal like in this German 38cm shell as fired by the Bismarck - the idea is to protect the steel from shattering as well as "lubricating" the shot's passage through the plate.

You do realise and M1 Barret Rifle without amour piercing rounds will not penetrate clean through 1/4 steel plate,and that has I believe has a muzzle energy of 16,600 joules/12,200 ft/lbs,with a 45gram projectile.So you need not only high energy but a very hard projectile to actually penetrate the steel.So using extremely hard projectile such as tungsten is on your to do list.


very, very wrong.

Have a look at the available rounds for the Barrett:

At 200m, the AP round will penetrate a whole inch of steel. At 500m, the sabot round from the same cartridge will go through 1.34 inches of steel.

Edit: USMC demonstration video showing the Barrett terminal ballistics
  • 0

Last edited by jackssmirkingrevenge on Thu Sep 27, 2007 11:22 pm, edited 1 time in total.
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

PreviousNext

Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'