Posted: Fri Jan 11, 2008 8:52 am
What's the minimum calibre you can rifle?
Earth's largest potato gun resource
https://www.spudfiles.com/
First off let me apologize for the obvious mistake; That should have read 6 lands and grooves, too many beers before writing a post I suppose .Ragnarok wrote:Sounds impressive, but until someone successfully rifles copper pipe, I'm going to have to wait. I'm not too fussed about accuracy, if I can hit it reliably from a safe firing distance, that's more than good enough for me, but I wouldn't mind trying a rifled barrel some time and seeing how it improves things.
What I have to ask is... how do you think that Joel might have got 5 lands and 6 grooves in his rifling? Unless I'm greatly mistaken, that's completely impossible - the numbers have to be the same.
I also compliment you on your writing ability, I'm sure one day I'll be wandering around here and find the corpse of the murdered english language hidden behind one of the threads in the combustion showcase.
I have done 1 inch barrels, but it is a real pain in the A@@! I prefer to go no smaller than 1.5 inches however, as I said before, if I make this a full time venture, I will most likely do barrels from 1 inch to however large someone wants.jackssmirkingrevenge wrote:What's the minimum calibre you can rifle?
In brief, I use a miniature router to cut the grooves. Please see my earlier post for more details.SpudMonster wrote:omg wtf guys? its not liek were in englsh classs so shut the he11 up! y do u have to be so bithcy and shyt?/ your so stupid lol sorry if i dont spend 10 extra minutes checking spelling and grammar, i just type it and enter it, if it bothers u so much u shouldnt even be on this site. im annoyed bcuz instead of ppl answering my ?s they just go on about my spelling when i only mispelled 2 words
Damn. After typing that I feel like I need to scrub my brain with turpentine and a wire brush.
How do you make the rifling lands different profiles? Do you have to make a different cutting head for each profile? I regret not purchasing a rifled barrel from Joel way back when, so I might wind up purchasing one now.
In brief, I use a miniature router to cut the grooves. Please see my earlier post for more details.SpudMonster wrote:omg wtf guys? its not liek were in englsh classs so shut the he11 up! y do u have to be so bithcy and shyt?/ your so stupid lol sorry if i dont spend 10 extra minutes checking spelling and grammar, i just type it and enter it, if it bothers u so much u shouldnt even be on this site. im annoyed bcuz instead of ppl answering my ?s they just go on about my spelling when i only mispelled 2 words
Damn. After typing that I feel like I need to scrub my brain with turpentine and a wire brush.
How do you make the rifling lands different profiles? Do you have to make a different cutting head for each profile? I regret not purchasing a rifled barrel from Joel way back when, so I might wind up purchasing one now.
I have done 1 inch barrels, but it is a real pain in the A@@! I prefer to go no smaller than 1.5 inches however, as I said before, if I make this a full time venture, I will most likely do barrels from 1 inch to however large someone wants.jackssmirkingrevenge wrote:What's the minimum calibre you can rifle?
Well, I think part of the difficulty lies in the thin walls, which you can't cut deep enough into. The best idea I currently have is some how creating some lands that sit inside the barrel, rather than cutting grooves.As for copper barrels, I have been getting into these as well and have thought about how to rifle them.
That sounds interesting, but the difficultly is that I live in the UK, and my launchers are created to fit UK metric copper sizes. That problem along with shipping means I'll have to regretfully decline your offer.What size barrels do you typically use? Maybe I could make a prototype or two and you could "pay" for them by firing (and logging) hundreds of rounds to test accuracy differences.
I would agree, but my username wasn't chosen after the Ragnarok mech from the game (my personal favourite mech is the Star Adder from Mechassault 2 - pity you only get to use it in the single player for less than half a level, and the Blood Asp simply isn't as good in my opinion). My username is just because I like Viking mythology.P.S. Mech Assult Rules!!!
I agree.Ragnarok wrote:Rifled 1" pipe would be a good thing. Rifling would be best on a low calibre launcher in the style of a rifle, and 1.5" is getting too large for that in my opinion. They have been done, but it seems too much to me.
Actually, you can buy brass tubing that fits very nicely inside a piece of copper pipe. The fit is not snug but not too loose either. My suggestion:SpudGunGuy wrote:As for copper barrels, I have been getting into these as well and have thought about how to rifle them.
Ragnarok wrote:Well, I think part of the difficulty lies in the thin walls, which you can't cut deep enough into. The best idea I currently have is some how creating some lands that sit inside the barrel, rather than cutting grooves.
SpudGunGuy wrote:What size barrels do you typically use? Maybe I could make a prototype or two and you could "pay" for them by firing (and logging) hundreds of rounds to test accuracy differences.
Ragnarok wrote:That sounds interesting, but the difficultly is that I live in the UK, and my launchers are created to fit UK metric copper sizes. That problem along with shipping means I'll have to regretfully decline your offer.
Ragnarok wrote:It would be nice to have a rifled launcher though, and you've swayed me towards trying to do it myself. I've still got the nearly impossible challenge I was "set" of trying to hit a 5" square target at 500 yards, and that's going to need rifling or stabilised darts (or both!), so I'd better get cracking.
Ahhh, Gotterdammerung!SpudGunGuy wrote:P.S. Mech Assult Rules!!!Ragnarok wrote:I would agree, but my username wasn't chosen after the Ragnarok mech from the game (my personal favourite mech is the Star Adder from Mechassault 2 - pity you only get to use it in the single player for less than half a level, and the Blood Asp simply isn't as good in my opinion). My username is just because I like Viking mythology.
I've wondered for a long time if you couldn't just fuse a slinky inside a PVC barrel to make rifling.SpudGunGuy wrote:Actually, you can buy brass tubing that fits very nicely inside a piece of copper pipe. The fit is not snug but not too loose either. My suggestion:
1 - Cut the Grooves first on the "inner" barrel. Thes could go all the way through.
2 - Coat the outside of the "inner barrel" with a fine layer of solder (this is called tinning).
3 - Slather the outside of the "inner barrel" with flux and slide it into the "outer barrel"
4 - Now heat the "outer barrel" so that the inner and outer barrels fuse together.
5 - Ta-da! A rifled copper (and brass) barrel!!!
Ok Seriously for the last time, NPT works with BSP.Ragnarok wrote:my launchers are created to fit UK metric copper sizes.
DYI wrote:The threads aren't "perfectly compatible". BSPT threads have a different angle, as well as rounded rather than square tops on the threads. They can be used together, but it isn't a good idea if you're planning on pressurising them. For a barrel, it probably doesn't matter.
wouldn't tinning be a PITA i would get a really good fitting outer barrel and just use epoxy to secure it in there instead of tinning, or you could just solder it normally.Actually, you can buy brass tubing that fits very nicely inside a piece of copper pipe. The fit is not snug but not too loose either. My suggestion:
1 - Cut the Grooves first on the "inner" barrel. Thes could go all the way through.
2 - Coat the outside of the "inner barrel" with a fine layer of solder (this is called tinning).
3 - Slather the outside of the "inner barrel" with flux and slide it into the "outer barrel"
4 - Now heat the "outer barrel" so that the inner and outer barrels fuse together.
5 - Ta-da! A rifled copper (and brass) barrel!!!
Hmmm, maybe I'll try doing that myself this weekend. Nothing like mixing a hot torch, flux, solder and booze!!!