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 52 users online :: 5 registered, 0 hidden and 47 guests


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

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

Sureshot BL-625 action video

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Unread postAuthor: USGF » Thu Apr 30, 2009 3:30 am

JSR, depends on production methods. Your slug design would allow lathe turning from just about any machinable material. If made from zinc or lead, I'm thinking along the lines of a casting or a partially cast slug that is finished by swaging. I'll try a standard split die first, I think filling would be difficult if the walls are too thin. Preheating the mold is a must. It would be a 3 part mold. Yes, I will sharpen the nose.
  • 0

Attachments
pellet mold 1.jpg
Pellet mold CAD rendering
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: USGF » Thu Apr 30, 2009 3:57 am

Sharper nose, should have an even better CG upfront. .94 lb in Lead
  • 0

Attachments
pellet mold 2.jpg
Sharper nosed Pellet mold
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Apr 30, 2009 4:52 am

That should do nicely, you could contact Gippeto as he's doing something similar for his own pneumatic monster:

Image

Image
  • 0

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

Unread postAuthor: USGF » Thu Apr 30, 2009 6:54 am

JSR, I saw that thread a while back. I did not see where it mentions him either casting or swaging the slugs with a waist. I plan on trying a 1.5" version first. I will adjust round weight by making the skirt thicker or thinner. I'd be interested to see what this would do to a soft target. Water melons, TVs and plywood.
  • 0

User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: jagerbond » Thu Apr 30, 2009 1:59 pm

whoa, I call it an early night and look what happens! Drawings are great USGF. These are exactly what I was thinking. As far as melons are concerned I offer this as an early prediction http://www.gallaghersmash.com/pictures/029.jpg
  • 0

User avatar
jagerbond
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Tue Jul 29, 2008 5:33 am
Location: Hawaii
Reputation: 0

Unread postAuthor: Technician1002 » Thu Apr 30, 2009 2:02 pm

jagerbond wrote:whoa, I call it an early night and look what happens! Drawings are great USGF. These are exactly what I was thinking. As far as melons are concerned I offer this as an early prediction http://www.gallaghersmash.com/pictures/029.jpg


A little off topic, but I actually built a Sledge-O-Matic for the youth group at church. It was a smashing hit. Love Gallagher's routine :D
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: USGF » Thu Apr 30, 2009 8:55 pm

Found some time to add the sprue.
  • 0

Attachments
pellet mold 3.jpg
Mold 3
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: USGF » Fri May 01, 2009 9:50 pm

Had a chance to machine 1 side of the mold assembly. Sorry about the clutter.
  • 0

Attachments
DSCF0098.JPG
Left Side
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: twizi » Fri May 01, 2009 9:57 pm

holy crap thats a nice mold i wish i had a drill press
still cant wait to see a finshed slug you should make a slug out of aluminum
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri May 01, 2009 11:06 pm

Beautiful... though, stupid question, why isn't the sprue at the nose of the mould? Aren't you going to get an air bubble there?
  • 0

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

Unread postAuthor: inonickname » Fri May 01, 2009 11:34 pm

twizi wrote:holy crap thats a nice mold i wish i had a drill press
still cant wait to see a finshed slug you should make a slug out of aluminum


I don't think it's really made with a drill press mate :?

And also you'd be hard pressed to find a worse slug than aluminum. Very lightweight.. You want a lot of weight, and if possible, strength. Lead, depleted uranium, carbides.. whatever you can get.

Though that looks truly awesome! Can't wait to see the slug it will make.

Unfortunately unless your going supersonic it will be rather inefficient but oh well.

Image
(WRI)
1. Is for subsonic flight
2. Is for supersonic flight
3. Is for hypersonic flight

(most efficient for each)
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri May 01, 2009 11:43 pm

inonickname wrote:Unfortunately unless your going supersonic it will be rather inefficient but oh well.

Image
(WRI)
1. Is for subsonic flight
2. Is for supersonic flight
3. Is for hypersonic flight


I beg to differ ;P
  • 0

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

Unread postAuthor: USGF » Sat May 02, 2009 1:38 am

JSR, We make lots of fishing weight, candle and chocolate molds too. To keep the cost of the molds down we make them from the smallest blocks we can. We simply advise our clients to tilt the mold till no bubbles appear in the castings. The parting line is kept a little rough too, it is not air tight. Air will escape easily but lead will only produce a tiny flash line. I made the other side a few hours ago, I will make the core on the lathe later. Oh, I placed the sprue on the side so the tip would be unblemished. There is a slight undercut in the sprue right where it meets the body so it will break off fairly clean. Just touch up with a utility knife.


Oh, as inonickname mentions, this is not your average drillpress doing the work :D It's a small CNC VMC (Computerized Numerical Control Vertical Machining Center), weighs about 3 tons. Cut each side of the mold in about 40 minutes.
  • 0

Last edited by USGF on Sat May 02, 2009 1:48 am, edited 1 time in total.
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

Unread postAuthor: Gippeto » Sat May 02, 2009 1:40 am

holy crap thats a nice mold i wish i had a drill press


CNC router or mill is more likely. Nice pocket work too. :)

Jack, the mold will have to be vented ("scratches" radiating out from the cavity) to allow air to escape. The head pressure of the sprue will ensure that the mold is filled.

That slug WILL lay a serious hurt on "something". :D

Edit: Typing slow again. Must be the lagers. :lol:

40 minutes is flying. Must be nice to have REAL machinery.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: USGF » Sat May 02, 2009 2:03 am

Got a pic of the two halves.
  • 0

Attachments
DSCF0100.JPG
Two halves
User avatar
USGF
Master Sergeant
Master Sergeant
 
Posts: 173
Joined: Sun Mar 08, 2009 5:39 am
Reputation: 0

PreviousNext

Return to Combustion Cannon Database

Who is online

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

Reputation System ©'