| interested? |
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| DYI |
 Posted: 01/24/2008 15:27 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2308
1164.60 Spud Bux
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| If it would be possible for you to rifle steel pipe, I could get 2" seamless steel for a barrel, which would likely be cheaper than copper anyway. |
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| judgment_arms |
| Posted: 01/24/2008 17:32 PM Post subject: |
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The Judge
Joined: 17 Oct 2006
Posts: 1243
1456.17 Spud Bux
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I don’t know about steel… I suppose I could use some high carbon high temper steel to cut it, or maybe a steel cutting drill bit… I’m not going to say if I can or can’t or if there’s even a chance that I could until I have done more research… sorry.
On the other hand, that sounds like it would make a good barrel, how thick are the walls? |
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| DYI |
| Posted: 01/24/2008 17:47 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2308
1164.60 Spud Bux
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With a bit more research, I discovered that steel would cost about the same as copper. The advantage is that the walls would be thicker, and with pressures theoretically in excess of 4kpsi, that's always a good thing.
I'll probably just stick with smoothbore though. Construction of this can't start until March anyway. |
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| Ragnarok |
| Posted: 01/24/2008 20:17 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2544
6844.33 Spud Bux
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I think it's of fairly high priority that we find out how fast you can actually spin a potato.
I've done some thinking, and I can now work out the forces trying to spin a spud to bits if I know it's spin speed and diameter. Problem is, I don't know what forces said spud can take. I need to go down to the university labs with a potato and put it in their load testing machine...  |
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| zephir |
| Posted: 01/25/2008 2:49 AM Post subject: |
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Private First Class
Joined: 14 Jan 2008
Posts: 25
111.82 Spud Bux
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I might need a rifled barrel. I'm build an hybrid (if you can call it that), I don't know whether it'll be benefical, I need 1/2" copper pipe, about 26" of it, my main projectiles will be AA batteries and front-jacketed lead slugs.
The AA batteries should fit well in the 1/2" copper pipe, it fits well in the ones I have, don't know about you, though. The pipe needs to have thick walls, one end have a lightly larger diameter than the other, .59" inner diameter going in about 1.15 inches.
The lead projectiels I plan on using will be jackets in the front half, the back will not. It would adapt to the rifling better. They will be slightly wider than the AA batteries, and about 3 inches long. |
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| jackssmirkingrevenge |
| Posted: 01/25/2008 6:04 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6981
11122.02 Spud Bux
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It's important to note that rifling will not affect hard projectiles like marbles, in order to be effective the projectile mus be soft (or have a soft ring/exterior) that the lands can bite into in order to impart spin.
For example, for an AA battery, it will need to be well wrapped in duct tape in order to be spun. Also, a battery is very long in relation to its diameter meaning it would need a very fast twist rate to stabilise it, which would probably be unrealistic for spudguns. |
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| judgment_arms |
| Posted: 01/25/2008 11:36 AM Post subject: |
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The Judge
Joined: 17 Oct 2006
Posts: 1243
1456.17 Spud Bux
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Zephir, how long are your lead slugs?
Jack (you never really said if it’s okay that I call you that), I believe I already said that hard projectiles would need to be wadded, or was that in the other thread?
As for the rate of twist, the old Greenhill formula says 1 in 12 to stabilize a AA, and its bean my experience that the updated one gives a significantly higher rate of twist.
Attention everybody interested in purchasing a rifled barrel:
Do to the fact that everybody needs/wants a different bore size with a different rate of twist, I’ve decided that instead of selling a few particular sizes I’ll make custom for each person. Note that that will mean barrels will be slightly more expensive, prices are as follows:
Pipe:
Note: I will not be rifling copper tubing any bigger than 1 inch
2” will be $2.75 U.S. a foot for PVC $4.00 a foot for SCH80 PVC
1 ½” will be $2.00 U.S. a foot for PVC
1” will be $1.50 U.S. a foot for PVC $17.75 U.S. a foot for type L copper
¾” will be $1.25 U.S. a foot for PVC $9.50 U.S. a foot for type L copper
½” will be $1.00 U.S. a foot for PVC $7.00 U.S. a foot for type L copper
Rate of twists currently offered:
1 in 14 (300 fps paintballs)
1 in 60 (Stabilizing NERFs, potatos)
Custom Runs will be an additional $10.00 U.S.*
You pay shipping.
*If I do not have a blank (previously referred to as a “die”) that matches the rate of twist you want I’ll suggest one close and ask if that will suit, if not, or if there’s not one close enough, I’ll have to make a new blank which will cost you an additional $10.00 U.S.
Sorry for the inconvenience, but I have to turn a profit some how.
NOTE: if before I start filling orders I get enough people (5-10 depending on bore size) that want the same Rate of Twist I may drop the custom run fee, also if two or more people (but not enough to drop the fee) want the same rate of twist the price of the new blank will be split up between them.
I’m going to start taking orders now but it’ll be most likely be after April before I can get stuff together to fill your orders
If you’re still interested PM or E-Mail me, or make a post, with what caliber, what type of pipe, and what you want it to shoot at what velocity; i.e. 1 ½” inch PVC rifled for potato slugs 5 inches long at 300fps.
questions? PM me or make a post.
Thanks!
Last edited by judgment_arms on 04/11/2008 22:10 PM; edited 2 times in total |
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| jackssmirkingrevenge |
| Posted: 01/25/2008 12:08 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6981
11122.02 Spud Bux
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| judgment_arms wrote: | Jack (you never really said if it’s okay that I call you that), I believe I already said that hard projectiles would need to be wadded, or was that in the other thread?
As for the rate of twist, the old Greenhill formula says 1 in 12 to stabilize a AA, and its bean my experience that the updated one gives a significantly higher rate of twist. |
Jack is fine 
I must have missed that, just thought I'd point it out for those who weren't aware that it takes a little more than simply rifling your barrel to get gyroscopically stable projectiles. |
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| judgment_arms |
| Posted: 04/11/2008 22:19 PM Post subject: |
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The Judge
Joined: 17 Oct 2006
Posts: 1243
1456.17 Spud Bux
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Attention:
With the rising price of crude oil, the price of both PVC pipe and the gas to go get it has gone up, it saddens me to say that I’ll be charging an extra $0.25 per foot, sorry y’all…
In addition, the first five people to place orders will get 10% off their total price.
People who have placed orders:
Socoj2, 5 feet of 2 inch SCH 80 with a rate-of-twist of 1-in-60
I will hopefully begin filling orders within the month.
Current prices and rate-of-twists are in my previous post. |
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| Ultimate Weapon |
| Posted: 04/22/2008 2:31 AM Post subject: |
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Private
Joined: 15 Feb 2008
Posts: 15
31.92 Spud Bux
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| Hey could you rifle 1/2" CPVC? It's only slightly smaller than sch40 1/2" PVC. |
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| judgment_arms |
| Posted: 04/22/2008 6:31 AM Post subject: |
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The Judge
Joined: 17 Oct 2006
Posts: 1243
1456.17 Spud Bux
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I ain’t to sure, I’ll have to see if I can find a rod that’ll fit in 1/2 CPVC.
How long of a barrel were you looking for? |
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| PCGUY |
| Posted: 04/22/2008 8:38 AM Post subject: |
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Evil Admin
Joined: 18 Aug 2004
Posts: 1233
4406.12 Spud Bux
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| If you are really to the point of selling these, then you need to make a new topic in classifieds along with pictures of the product and your SpudFiles user name in the photos. |
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| judgment_arms |
| Posted: 04/22/2008 20:57 PM Post subject: |
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The Judge
Joined: 17 Oct 2006
Posts: 1243
1456.17 Spud Bux
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| PCGUY wrote: | | If you are really to the point of selling these, then you need to make a new topic in classifieds along with pictures of the product and your SpudFiles user name in the photos. |
Well, I’m not quite to the point of selling them yet, I still need to finish me rifling machine, which requires money that’ll, hopefully, have in a week or so.
But as soon as I get the rifling machine up and running I’ll put a thread in the Classifieds section.
On that note, how much do I owe you per sale?
For those interested in a rifled barrel I am indeed taking orders right now. |
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| Ultimate Weapon |
| Posted: 04/23/2008 3:51 AM Post subject: |
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Private
Joined: 15 Feb 2008
Posts: 15
31.92 Spud Bux
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| In that case. I would like to order 2' of rifled 1/2" CPVC. It will be shooting 2 inch foam darts at around 200 fps. |
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| ajdevi92 |
| Posted: 04/23/2008 4:13 AM Post subject: |
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Major
Joined: 23 Nov 2007
Posts: 363
414.23 Spud Bux
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| can some one please link me to somthing that shows me how to rifle a barrel please |
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