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Author Topic: DIY Propane Forge  (Read 14047 times)

rockchucker

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DIY Propane Forge
« on: December 05, 2009, 05:30:36 pm »

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ElNicoGrande

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Re: DIY Propane Forge
« Reply #1 on: February 18, 2010, 02:07:31 pm »

Hi, new to the forum.

Thanks for posting the linik! This is awesome. I've been trying to find a way to get into knife-smithing and the like. have you tried setting this up?
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gaurdduck

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Re: DIY Propane Forge
« Reply #2 on: February 18, 2010, 02:18:18 pm »

I have a wood burning rocket kiln in the backyard that I can use for small pieces and is more efficient than this.
A charcoal (not briquettes) fire with a hair dryer and a piece of pipe will get hot enough to get your metal to a
bright cherry red. Wood will only get it up to a maroon color unless the fire is burned down to coals.
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rockchucker

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Re: DIY Propane Forge
« Reply #3 on: February 18, 2010, 05:45:52 pm »

have you tried setting this up?

Nope. Wish I had a place where I could.
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... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

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ZooT_aLLures

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Re: DIY Propane Forge
« Reply #4 on: February 19, 2010, 04:23:50 pm »

Hell..............you get some catshit sand, a coffee can, a piece of 3/4" water pipe and a propane torch and you can build yourself a furnace that'll melt pretty silver coins down into lumps of silver, or melt aluminum scrap into a liquid form that you can pour into sand molds and make things that look remarkably like AR-15 lowers and uppers...........

And I know this because I've done it.............

The same coffee can a hair blow dryer and a handful of charcoal or even hardwood will do the same thing.

Make it more efficient by using a real refactory rather than clay, and make it big enough and you've got an iron smelting furnace...............make it tall enough, to use convection to draw air rather than a blower, and you've got a cupola furnace.........

Now you can smelt iron and cast iron or any metal with a lower melting point without an electrical source....................

Yeah.............had a micro foundry going in my brothers basement on propane, or ran it out in a shed with the overhead door open on charcoal...........

Used heavy soup cans for a crucible for aluminum..............got about two heats out of a can before they'd start falling apart..................and used little stainless steel garnish cups that cost $1 for five from wally weirld for silver and brass....

I cast all the parts from aluminum, and used my machinery to machine the parts, and built a little steam engine last year using the stuff I just described...................
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Rarick

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Re: DIY Propane Forge
« Reply #5 on: February 19, 2010, 05:36:17 pm »

Youtube has pictures!  Search is your friend.  A lot of those videos lead off to interesting sites too, so if you do not have a big connection it is still worthwhile.

There is a guy using a modified log splitter for a slide hammer............youtube.com/watch?v=62iHEaE8uzI

A demo on a cupola furnace, they get a 60 lb chunk of steel out of it............youtube.com/watch?v=gDy1jx6mLgs

Fascinating stuff.

Steel Bamboo youtube.com/watch?v=-4MF7HO-0kY
« Last Edit: February 20, 2010, 07:05:44 am by Rarick »
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Shanks Mare

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Re: DIY Propane Forge
« Reply #6 on: April 13, 2011, 07:53:56 pm »

Hey Zoot!

I've repaired several boilers with refractory and ceramic wool, and have lots of scrap. Never thought of it before, but I imagine I could make a little propane forge...that post of yours has me to thinking too.

Always wanted to make a knife or two, just to start. Can't even imagine forging my own uppers for an AR. Crazy!
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ZooT_aLLures

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Re: DIY Propane Forge
« Reply #7 on: April 13, 2011, 09:22:25 pm »

Quote
There is a guy using a modified log splitter for a slide hammer...

Air is a bit faster than hydraulic fluid.............and a big air cylinder makes a dandy lift for drop hammer...........you just need feed lines big enough to move a lot of air.


Quote
Can't even imagine forging my own uppers for an AR. Crazy!

mere child's play once you mill the dies

Quote
but I imagine I could make a little propane forge

You could always make it in such a manner that you could merely set another level of refactorized wall above your forge and you'll have "instant foundry furnace".

I've been using those big tin popcorn cans that you see floating around during the christmas holidays with big coffee cans for inner wall forms.....gives about a three inch wall thickness...........but I've got my head wrapped around finding a clean 55 gallon drum and a 30 gallon drum for a liner so I can melt and pour a few hundred pounds of metal at a pop.
Other folks talk about pulling the liner out before using the furnace..............but hell, it burns out fast enough anyways


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Even some cowboy and indian outlaws in the 1800's eventually stopped sleeping under buffalo skins, and came to town to entertain paying customers. For some I imagine the bruising of their ego never healed.

We all have some scar tissue that never lets us completely forget the intent of the adventure.

Shanks Mare

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Re: DIY Propane Forge
« Reply #8 on: April 13, 2011, 10:40:37 pm »

I've got a brand new 30 gallon drum that I was thinking of making another small wood stove out of for elk hunting.....too bad you didn't live closer. I've a good line on refractory brick, the heavy duty ones that will not erode, and the light powdery ones that don't absorb heat. Their less than a couple of bucks apiece.

I've got a small forge, I just need to buy a hose and a regulator to see what it can do. Maybe it won't get hot enough, don't know.
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ZooT_aLLures

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Re: DIY Propane Forge
« Reply #9 on: April 13, 2011, 11:03:09 pm »

Quote
I just need to buy a hose and a regulator to see what it can do.

Harbor freight sells a generic propane torch that doesn't use a regulator, and it has a shroud that provides the carburation.

Costs $19
Take the torch and clamp it to the end of a fairly short piece of 2" waterpipe that runs through the wall of your "forge/furnace" and you're good to go.
Remember the fire won't be in the pipe.........but instead will ignite after being effectively mixed with air in the pipe at the exit of the pipe inside the furnace.

Ground cat shit sand makes good plinth blocks to hold your crucible higher in the furnace where it can get a better heat too.
I build mine so the fire comes in just below the top of the plinth block and at a tangent to the periphery of the inner liner to produce a smooth "swirl" around the inner wall of the furnace.
Like I said though............I use cat shit sand for the refactory lining(actually insulation in this case), and bake it into ceramic during my first few heats, after allowing it to air dry for a week or so.
And the last piece is a cover with a hole in the center.
I make that the same way out of the same material, but put a half a dozen or so wire coat hangers pulled into a circle in the mix to hold it together and a heavy wire loop handle to pull it off the furnace after the heat............because the thing IS going to crack.
I make the hole about 1/2 the diameter of the inner liner which produces a funnel to the swirl at the top of the furnace towards the top of the crucible.
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Even some cowboy and indian outlaws in the 1800's eventually stopped sleeping under buffalo skins, and came to town to entertain paying customers. For some I imagine the bruising of their ego never healed.

We all have some scar tissue that never lets us completely forget the intent of the adventure.

FDD

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Re: DIY Propane Forge
« Reply #10 on: April 12, 2016, 12:36:21 pm »

WOW more things to think about
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If we want our grandchildren to be able to give thanks for being Americans, we'll need to.....start steering a course away from government control of our lives-and start moving back toward greater personal responsibility.   Ed Feulner

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Rarick

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Re: DIY Propane Forge
« Reply #11 on: April 15, 2016, 08:06:04 pm »

I like the idea of the 55 gallon drum and 30 gallon drum sort of setup.  A furnace to melt enough volume to cast a block for a v-twin engine appeals to me for some reason...

Gah! I am horrified! I just searched for a 100 gallon salvage drum, to provide the outer shell on a 55 gallon inner drum sort of furnace.  I was thinking enough metal for a 4 cylinder engine block.   Test the limits of an Idea eh?  Nearly half a thousand before even pricing out a blower and the refectory insulation is not a good price.

I guess at that scale you are better off buying something from a place that is going out of business, eh?

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........Duct tape is like the force, it has a light side, a darkside and holds the universe together.  It is theoretically reinforced with strings too.  (The dome has a darkside, lightside and strings of rebar for reinforcement too!)
-------------------------------------------
Most of the time news is about the same old violations of the first principles of consent and golden rule with a dash of force thrown in........ with just enough duct tape to be believable.

FDD

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Re: DIY Propane Forge
« Reply #12 on: April 15, 2016, 08:10:04 pm »

I like the idea of the 55 gallon drum and 30 gallon drum sort of setup.  A furnace to melt enough volume to cast a block for a v-twin engine appeals to me for some reason...

Gah! I am horrified! I just searched for a 100 gallon salvage drum, to provide the outer shell on a 55 gallon inner drum sort of furnace.  I was thinking enough metal for a 4 cylinder engine block.   Test the limits of an Idea eh?  Nearly half a thousand before even pricing out a blower and the refectory insulation is not a good price.

I guess at that scale you are better off buying something from a place that is going out of business, eh?

try looking around oil pipe equipment co.

I am sure they have a lot of large pipe laying around, or salvage co., not sure where you are but here in Wyoming, lots of scrap steel for sale.
 
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Nobody needs an AR-15
Nobody needs a whiny little bitch ether, yet here you are

If we want our grandchildren to be able to give thanks for being Americans, we'll need to.....start steering a course away from government control of our lives-and start moving back toward greater personal responsibility.   Ed Feulner

I think, therefore I am not a progressive liberal socialist marxist democrat

That's WY
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