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rmack898
11-07-2016, 06:43 PM
Two years ago I acquired a piece of 12" heavy wall pipe about 2' long that I had intended to make a propane forge from, that pipe is still sitting on the ground behind my shop.

I have always wanted beat on hot metal, so the idea of a forge was alway lurking in the back of my head. To add fuel to the fire, Jenn starts posting videos of her making metal bend to her will and that makes me revisit the idea of having a forge at my shop. So I watch a few more videos on you tube and I decide that the propane forge is out. If things go south, I don't want to be dependent on having a bottle of gas to be able to bend and shape metal. So a coal forge is where I'm heading.

I have an anvil (or possibly, an anvil shaped object), we'll get to that later. I have a selection of BFH's.

So here I go off on a metal working tangent that I have to make time for in an already full plate of shit that I have to do.

The beginning of my coal fired forge.
I started out with a 6"X6" piece of 3/8" plate. I found center and drilled a section for 1/4" holes around a center 3/8" hole. I took some 2"X3/8" flat bar and made a frame for the 6"X6" and welded it all together at a 33 degree angle, and that is the beginning of my fire pot.

I plan to make a folding table that the fire pot will fit into. The table will get a removable hood/chimney of some sort (I'll welcome suggestions on that. Hint hint Jenn). I plan on making my own hand crank forge blower and I have a few ideas on how to do that but I need help on what kind of airflow requirements I'll need.

That's where I'm at for now, I welcome any and all advice as I'm in strange waters.

Here's pics of what I have done.

milomilo
11-07-2016, 07:11 PM
What size pipe you using for the air?

rmack898
11-07-2016, 07:20 PM
I'm thinking 2-1/4"

Ironman
11-08-2016, 01:32 AM
Mack, I'd open up that air hole full size and put an ash/clinker sort of butterfly breaker in there.
The holes you have will close off with clinker.
What kind of coal? Good firebox for coking coal, too shallow for bituminous is my thoughts.

allessence
11-08-2016, 10:42 AM
Gerry is correct..

Also your firepot might be a little to big area wise. Ideally you want tighter sides.

Go with 3" if you have it.. 2.25 is a little small..

I'll post up pictures later..

Love to see you getting it done..

What kind of coal?

rmack898
11-08-2016, 06:05 PM
put an ash/clinker sort of butterfly breaker in there.
.
What kind of coal?

Can you give me an idea on what sort of butterfly breaker you're referring to?

Also your firepot might be a little to big area wise. Ideally you want tighter sides.

Go with 3" if you have it.. 2.25 is a little small..

I'll post up pictures later..

Love to see you getting it done..

What kind of coal?

If 6X6 is too big, how big should it be?

I can go with any size pipe as I haven't built it yet so if you say 3" then 3" it will be.

As far as coal goes, I have no idea. I don't know what type of coal is available here in my neck of the woods. What should I be looking for?

I'm pretty much clueless so that's why I posted this before I get too far along to make a change. Keep it coming folks.

allessence
11-09-2016, 03:05 PM
Ironman's firepot design will work well..

If you can get the PDF it will answer your questions in one fell swoop..


I've seen videos where the people had this forges with barely any fuel in them, and they claim if you need anything more than a little fire for anything you are just wasting coal..

I disagree whole heartedly.. You build a fire for the work you are doing..

Anyhow.. The PDF is just about spot on.. i like my bottom of the firepot about 4.5-5" across length wise..


3" pipe will work great as most of the old blowers electric and hand are 3" outlet.. Pipe or square tube is what most use.. I like a swept elbow with ash pit at the bottom.. This directs air better.. but I know a few that just use a straight pipe and are happy with the results..

As for coal.. Call around to a few suppliers, garden shops and such and see what they offer or if they can get smithing coal.. "Hi, do you care blacksmithing coal"? Or "Hi do you carry Soft coal"?

rmack898
11-09-2016, 07:00 PM
Ironman's firepot design will work well..

If you can get the PDF it will answer your questions in one fell swoop..


What PDF? Did I miss something?