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 43 users online :: 4 registered, 0 hidden and 39 guests


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

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

Ping pong ball ammo for a 1.5" 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

Ping pong ball ammo for a 1.5" barrel.

Unread postAuthor: wangpushups » Sat Nov 17, 2007 3:38 am

I was thinking about using ping pong balls for my 1.5" barrel and i thought of a great idea... With a dremel or whatever drill a decent size hole and put in a piece of string and let it hang out about an inch. Fill the ball full of concrete and let it set. Get a cup of hot wax and a cup of cold water. With the string hanging out just dip the ball into the wax and dunk it in the cold water. When its done just snip the string off. The reason for the wax is because the ball is about a millimeter too small for the barrel but the wax makes the diameter bigger so that it'll fit. I haven't tried this out yet but i'm sure it'll work wonders.
  • 0

Last edited by wangpushups on Sat Nov 17, 2007 4:11 am, edited 1 time in total.
User avatar
wangpushups
Sergeant Major
Sergeant Major
 
Posts: 185
Joined: Sun Sep 23, 2007 12:28 pm
Location: Wisconsin
Reputation: 0

Unread postAuthor: Hubb » Sat Nov 17, 2007 3:50 am

With a decent powered launcher, this ought to be capable of some serious damage. When completed and tested, please post pics.

You know, this is not limited to cement. Why not buy some balls by the bulk and experiment with different fills.

Also, that is a pretty good idea about making the ball to fit, although a sabot would have worked, too.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: wangpushups » Sat Nov 17, 2007 4:09 am

Have you seen my cannon... it would be perfect ammo for it.
  • 0

User avatar
wangpushups
Sergeant Major
Sergeant Major
 
Posts: 185
Joined: Sun Sep 23, 2007 12:28 pm
Location: Wisconsin
Reputation: 0

Unread postAuthor: Hubb » Sat Nov 17, 2007 4:13 am

You talking about The Best Cannon On This Website?

If so, I do believe this ammo would suit that quite well.
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: wangpushups » Sat Nov 17, 2007 4:34 am

That'd be it...
  • 0

User avatar
wangpushups
Sergeant Major
Sergeant Major
 
Posts: 185
Joined: Sun Sep 23, 2007 12:28 pm
Location: Wisconsin
Reputation: 0

Unread postAuthor: MikeNice » Sat Nov 17, 2007 9:53 am

I've tried filling ping pong balls before, and with one small filling hole, concrete / cement has a real hard time drying. The drill hole just isn't enough to let enough moisture out. Granted I was using water for a liquid, you might try alcohol or something else that will evaporate quickly . . . .keep us poasted.
  • 0

Your face is going to freeze like that. http://iplaaz.freehostia.com/
User avatar
MikeNice
Staff Sergeant
Staff Sergeant
 
Posts: 115
Joined: Tue Nov 28, 2006 4:37 pm
Location: Queen Creek, AZ
Reputation: 0

Unread postAuthor: wangpushups » Sat Nov 17, 2007 1:03 pm

Well how long did you let the concrete set? I was thinking more like a full 24 hours for mine, mabey longer... I could go with something else thats like concrete if that doesnt work, or anything thats dense really. I dont think sand would work too good, since the ball will spin too fast and if i were to have like a piece of tape on the hole, maybe the momentum would cause the sand to come out... Anyone try this...? I could be wrong. Or maybe if i fill about 9/10ths of it up with sand ill fill the rest with gorrilla glue or something.
  • 0

User avatar
wangpushups
Sergeant Major
Sergeant Major
 
Posts: 185
Joined: Sun Sep 23, 2007 12:28 pm
Location: Wisconsin
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: LikimysCrotchus5 » Sat Nov 17, 2007 1:33 pm

Well first of all, the sand shouldnt fly out because since the ball is goin so fast, the air pressure outside it would keep the ball in. This would be kindof an example of bernoulli's (spelling?) principle. Because when there is a air flow, that creates lower pressure. Since high pressure tends to equal out with low pressure, the surrounding are would push in, cause in the sand to stay in. But if that airflow isnt fast enough, meaning if you projectile isnt flying fast enough, then the sand wouldnt stay in. But the tape should be fine anyway. Its like swinging a bucket of water in a circular motion. Just as you all know, the water stays in, so the same can be applied here. But sand would obviously not perform as well as concrete because it is not as dense and hard as conctrete, but also there are little gaps between sand grainules that are air pockets and will decrease performance. So i really wouldnt use sand at all. :D
  • 0

4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
LikimysCrotchus5
Brigadier General
Brigadier General
 
Posts: 1100
Joined: Tue Sep 04, 2007 10:16 pm
Reputation: 0

Unread postAuthor: MikeNice » Sun Nov 18, 2007 6:53 pm

more than a week, it never dried. A small plug dried where the hole was and the rest never dried. I got bored waiting and broke it open. Cement dries when a large amount of it is exposed to the air. When a tiny little bit is exposed, it just won't dry.
  • 0

Your face is going to freeze like that. http://iplaaz.freehostia.com/
User avatar
MikeNice
Staff Sergeant
Staff Sergeant
 
Posts: 115
Joined: Tue Nov 28, 2006 4:37 pm
Location: Queen Creek, AZ
Reputation: 0

Unread postAuthor: DeathBlade » Mon Nov 19, 2007 9:49 am

I would mix fiberglass epoxy and sand 50/50% that would dry inside a ping-pong ball easily, its what I do. I never thought of candle dunking one to take up the extra diameter.
  • 0

Please vote in my weekly poll for the project of the week!

www.deathblog.co.nr

DeathBlade
Specialist
Specialist
 
Posts: 43
Joined: Fri Nov 24, 2006 2:28 am
Reputation: 0

Unread postAuthor: wangpushups » Mon Nov 19, 2007 10:02 am

Should work better than just sand itself
  • 0

User avatar
wangpushups
Sergeant Major
Sergeant Major
 
Posts: 185
Joined: Sun Sep 23, 2007 12:28 pm
Location: Wisconsin
Reputation: 0

Unread postAuthor: williamfeldmann » Mon Nov 19, 2007 12:25 pm

You could add baking soda to the concrete powder.

For each cup of concrete powder you mix up, add around a 1/8 teaspoon of baking soda. Then mix with appropraite amount of water. If you really want fast set times, replace water with denatured alcohol (look by the paint thinners). Do not use rubbing alcohol as it is a very different concentration and more expensive.

When you mix in the liquid of your choice, make sure you THOROUGHLY mix. Otherwise you negate the ability of the baking soda. It cut my dry time down to around 6-10 hours (depending on humidity, warm dry places work faster).

Thanks to Grumpy for the tip to me: seen here Tip and info on page 2 of this thread.

BTW, portland concrete powder is uber destructive with any sort of good seal in the barrel. Make sure of what is behind your target!!!!!! Be careful, but its worth it.
  • 0

Trying to figure out how to make a SCUBA first stage regulator work for portable charging station. If only that pesky job thing didn't keep eating up all my time...

"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." - Albert Einstein
User avatar
williamfeldmann
2nd Lieutenant
2nd Lieutenant
 
Posts: 216
Joined: Sun Sep 09, 2007 6:55 pm
Location: Ames. Iowa, middle of BFE
Reputation: 0

Unread postAuthor: Lftndbt » Wed Nov 21, 2007 12:07 am

Instead of wax... Which I guess would only allow them to be shot once maybe twice before unusable...
Why not try some fibreglass resin? Same method just dip in resin...Maybe a bit messy...

Or perhaps... Some non-shrink construction grout might be a substitute for the plain cement.. You do mean cement not concrete don't you? Being that concrete has aggregate in it... which would negative affect your projectile's centre.
  • 0

User avatar
Lftndbt
Specialist
Specialist
 
Posts: 50
Joined: Mon Nov 19, 2007 9:29 am
Reputation: 0

Unread postAuthor: grumpy » Wed Nov 21, 2007 2:55 am

williamfeldmann,
i don't know why i did not think of this earlier (old age i guess) but you can use hydraulic cement if you need something to setup realy fast, most hardware and home improvement stores will have it. to better understand what i am talking about read this. http://www.swepcousa.com/bpsite/bppdf/j11089.pdf
  • 0


grumpy
Captain
Captain
 
Posts: 331
Joined: Wed Sep 26, 2007 7:48 am
Location: tampa,fla.
Reputation: 0

Unread postAuthor: DannyGlover666 » Wed Nov 21, 2007 3:40 am

Fill the balls up with piss tape em up and bombs away!!!
  • 0

User avatar
DannyGlover666
Private
Private
 
Posts: 14
Joined: Wed Nov 21, 2007 2:51 am
Location: Hollywood, CA.
Reputation: 0

Next

Return to Construction Materials/Ammo Discussion

Who is online

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

Reputation System ©'