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 40 users online :: 4 registered, 0 hidden and 36 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Poor man's valve block

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

Poor man's valve block

Unread postAuthor: irisher » Mon Aug 02, 2010 10:23 am

I have been fiddling around with epoxy casting lately and I discovered a new technique that could help the forum. What I came up was that you can use a variant of lost foam casting to create intricate air channels inside the block of epoxy. All that is needed is a foam form of the air channels you wish to create. I recommend the pink insulation foam from lowes/home depot because its smooth finish. Then you cast the block around it. It is very important to remember that foam is buoyant and you must account for that. When the block has cured all you have to do is pour paint thinner/acetone/gas/ carb cleaner or anything else that dissolves foam down into the block and it will eat all the foam leaving you with nice air channels. Edit: I also recommend using a metal file for creating the foam shape,it gives nice texture and doesn't take off material too fast.
:)

I hope this has helped any would be epoxyists and I also hope this thread could turn into a thread about epoxy casting tips.
  • 0

Last edited by irisher on Mon Aug 02, 2010 10:58 am, edited 2 times in total.
User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: SpudBlaster15 » Mon Aug 02, 2010 10:43 am

Pretty good idea, but do you think epoxy has adequate structural properties to be used unsupported as a valve body? Casting the block inside an aluminum or steel frame would probably be best.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: irisher » Mon Aug 02, 2010 10:51 am

do you think epoxy has adequate structural properties to be used unsupported as a valve body?

It all depends on how thick your block is and channel placement. Mine holds up fine but I can't guarantee that about all designs.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Aug 02, 2010 11:00 am

So, did you ever get that mould out?

I agree with spudblaster, for higher pressure larger bore applications, metal inserts/casing should definitely be considered.
  • 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: irisher » Mon Aug 02, 2010 11:05 am

So, did you ever get that mould out?
No, I had to make a new one but I got that one out and I am very happy with it.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Aug 02, 2010 11:10 am

Epoxy is very much one of those "if at first you don't succeed..." sort of techniques ;)
  • 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: irisher » Mon Aug 02, 2010 1:35 pm

Epoxy is very much one of those "if at first you don't succeed..." sort of techniques Wink

That could explain the row of failed epoxy work I have been accumulating. :roll:
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Sponsored

Sponsor
 


Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'