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 71 users online :: 4 registered, 0 hidden and 67 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Rifled copper barrel

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: Ragnarok » Sat Aug 16, 2008 4:09 pm

MaxuS the 2nd wrote::lol: Indeed, you will be made fun of.

Right! If that's the way you want it -- Cardinal! Poke him with the fun!

Image

Confess! Confess! Confess!

...Ahem.

That..Is a total moron.

Well to be fair, he was in charge of the economy for ten years of nothing but growth - not a single financial quarter was a loss. That had never been done before, and is unlikely to be repeated again soon.
Of course, he's made a lot of bad decisions since becoming PM, and the economy has now gone down the wotsit...

But enough of cluttering the thread with Monty Python references and bad jokes about Gordon Brown.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: jimmy101 » Sat Aug 16, 2008 5:30 pm

Pretty impressive. I'm surprised that grooves that shallow actually work on a spud.

Try hanging up sheets of news paper every 20 feet or so and shooting through them all at once. It's possible, though probably not very likely, that the spud is still tumbling but you got lucky and at that range it happens to be back to "nose forward" flight (or perhaps it's done n*180<sup>o</sup> tumbles).
  • 0

Image

jimmy101
Lieutenant General
Lieutenant General
 
Posts: 3127
Joined: Wed Mar 28, 2007 9:48 am
Location: Greenwood, Indiana
Country: United States (us)
Reputation: 7

Unread postAuthor: SpudFarm » Sat Aug 16, 2008 5:47 pm

i rifled my marble barrel like that right now.. i did so deep rifling that it almost cut through the barrel and it works..

it has like 100 turns through the barrel to
:oops:
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: al-xg » Sun Aug 17, 2008 4:43 am

I might try that if I cant find something to hang the sheets from :?
Im quite sure thay didn't tumble, just because the canon I used isn't very powerful and I can see the flight of the spud (sounds like a crappy film title ;)).

I did try putting a small nail in the nose of one of the slugs and It did left a mark, but I guess that is cheating as its putting its center of gravity forward and might have flown straight anyway.
Also It might leave a mark when flying backwards as the potato splaters on impact. :roll:

Il try filming a few shots.

Ooh, thats maybe a bit too much ?:) or you have a really long barrel ?
The prejectiles must be spinning very fast.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: Ragnarok » Sun Aug 17, 2008 5:01 am

al-xg wrote:I can see the flight of the spud (sounds like a crappy film title ;)).

*Puts on the Wagner*.
Dudalum, Dudalum, Dum dudah dah dum, dum dudah dah dum, dum dahudar dahhhh...

:D

Yeah, I chose Ride of The Valkyries over Flight of the Bumblebee, but Flight of the Bumblebee can't be put in onomatopœia so easily.


The prejectiles must be spinning very fast.

I'd be rather surprised if anything gripped rifling that steep at all - I'd more expect it to jump over the grooves.

Over rifling is not usually a good thing, usually a projectile that is spun too fast develops flight eccentricities.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: CasinoVanart » Sun Aug 17, 2008 5:08 am

Ragnarok wrote:
al-xg wrote:I can see the flight of the spud (sounds like a crappy film title ;)).

*Puts on the Wagner*.
Dudalum, Dudalum, Dum dudah dah dum, dum dudah dah dum, dum dahudar dahhhh...

:D

Yeah, I chose Ride of The Valkyries over Flight of the Bumblebee, but Flight of the Bumblebee can't be put in onomatopœia so easily.


The prejectiles must be spinning very fast.

I'd be rather surprised if anything gripped rifling that steep at all - I'd more expect it to jump over the grooves.

Over rifling is not usually a good thing, usually a projectile that is spun too fast develops flight eccentricities.


You should change your name then Rag, "OverRifle", has a nice ring to it!
  • 0

User avatar
CasinoVanart
1st Lieutenant
1st Lieutenant
 
Posts: 281
Joined: Wed Jul 30, 2008 1:10 am
Reputation: 0

Unread postAuthor: SpudFarm » Sun Aug 17, 2008 5:17 am

al-xg wrote:Ooh, thats maybe a bit too much ?:) or you have a really long barrel ?
The prejectiles must be spinning very fast.


it turned out like that because i have to adjust the speed of the drill up to get it to turn and then it suddenly started eating its way throug on about 500rpm..

they do rip themself through the rifing but it apears that it get some spin since i get round holes from really long slugs..

the barrel is about 1.6m since i cut of piecec to practice on
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Ragnarok » Sun Aug 17, 2008 5:17 am

CasinoVanart wrote:You should change your name then Rag, "OverRifle", has a nice ring to it!

Who said I had flight eccentricities? :?

Actually, I'll be honest, I'm not keen on flying or heights (which isn't very useful for a stage techie who has to spend lots of time up scaff towers and ladders :roll:) - would that count as a flight eccentricity?:P
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: al-xg » Sun Aug 17, 2008 5:24 am

Oh, right, I didn't use a drill when rifling my barrel as the tool's ridges set the rotation.

I pulled mine through and left the turning to the tool, intead of turning it and leaving the pulling to the tool :)


@ Rag, mmm might just not be enough, on the other hand something like this http://www.youtube.com/watch?v=h2sI8vIJQY8... :roll:
You lucky bastard !
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: SpudFarm » Sun Aug 17, 2008 5:27 am

i know but i had no way of pulling that far while holding the barrel stable when i was 2m from the barrel :D

i will give it one more try and lay some effort into it when i know that it works.
  • 0

"Made in France"
- A spud gun insurance.
User avatar
SpudFarm
Donating Member
Donating Member
 
Posts: 2563
Joined: Sat Nov 04, 2006 9:39 am
Location: Norway Trondheim area
Reputation: 0

Unread postAuthor: nakarti » Wed Oct 21, 2009 4:32 pm

String or cable to the end of the rifler and winch it through instead of push it through?

I now want to do inward-groove rifling on my next gun, but I have to build smoothbore first!
  • 0


nakarti
Private
Private
 
Posts: 10
Joined: Tue Sep 16, 2008 10:51 pm
Reputation: 0

Unread postAuthor: Brian the brain » Fri Oct 23, 2009 4:53 pm

Yo Psycix..see how close I was?!?!?!

All I had to do was apply tape to prevent the head from digging in!!

And to think I was so known as a kid to use scotch tape for everything my folks gave me a nick name
Plakband Japie
Wich translates to something like Scotch Tape Jake...


I'll rebuild my own method ( deeper grooves) soon.
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: ThegunGuy » Fri Oct 23, 2009 11:31 pm

Good job on that it looks great. The 1:8 twist on the rifling sounds about perfect. But you will probably need much deeper rifling for it to be accurate. The little tiny lines on that will slip a lot unless you are using over sized projectiles that are breach loaded. If you have ever seen the rifling in a muzzle loader rifle it has very deep rifling to catch hold of the projectile. The lands are as big as the grooves in a lot of the muzzle loaders I have seen and are very deep some are almost 1/16 of an inch deep. Pretty much all you need to do is widen the teeth on the rifling tool and make them sharper on the edges so it will shave metal off of the inside of the barrel. But you probably would have to sleeve the barrel with something to make it strong enough to withstand higher pressure.
  • 0


ThegunGuy
Corporal
Corporal
 
Posts: 62
Joined: Mon Oct 12, 2009 1:16 pm
Reputation: 0

Unread postAuthor: john bunsenburner » Sat Oct 24, 2009 7:16 am

Perhaps doing this with alli woudl be easier and would give better results.

And i agree to making the grooves deeper and wider.
  • 0

"Did you ever stop to think that out of the seven deadly sins envy is the only one which doesn't give the sinner even momentary pleasure"-George Will
User avatar
john bunsenburner
Major General
Major General
 
Posts: 1446
Joined: Sun Oct 19, 2008 5:13 am
Reputation: 0

Unread postAuthor: Ragnarok » Sat Oct 24, 2009 7:41 am

john bunsenburner wrote:I agree to making the grooves deeper and wider.

I don't. Copper already has very thin walls, so a groove can only be so deep without seriously compromising strength.

Like I have said for no short length of time, if I were rifling copper by cutting grooves , I'd pretty much insist on sleeving it.
Still, that's not the way I'm planning on doing it...
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

PreviousNext

Return to Construction Materials/Ammo Discussion

Who is online

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

Reputation System ©'