Ok so,I'm going to,be building a forge from a used propane cylinder, amd i decided i wanted to post pics as i do everything,I am going to be building the forge using the steps from the pdf that is on Wayne Coe's website  ill be sure to take pictures as often as possible and will be asking for help as needed wish me luck this will be the first propane forge ive ever made 

There is one thing I havent been able to figure out yet and that is the holes for,the burners, 

 

In the pdf all it says is this

5. Drill, or cut, a hole in the top (larger part) 2” down vertically from the top and if using one burner 
centered front to back. If using two burners put one about 1/3rd back and the other about 2/3rd 
back. By making this hole down 2” vertically from the top of the form you will have this hole 
positioned so that the burner can enter the fire box at a tangent or level to the floor, causing the 
burning gases to swirl within the forge.

 

Now my intention is to do a double,burner and I intend my burner to be 3/4 inches, so how large does the initial hole need to be?

Btw any tips, or advice is very much appreciated, I'm intending to use Frosty's t burner design 

Main tip is to follow the instructions of the designs you have mention exactly. They have been tried and tested, and will work well for you provided you don't deviate. 

Best of luck with your build! 

If you get stuck, a picture speaks a thousand words, so let us see what you've done, what you're working with, etc. 

Have fun

Ok I get that that is what I'm trying to do, but the only thing I cant figure out is how large the pipe needs to be, the pipe in the pic that the arrow is pointing to how large would the diameter need to be,

Anyways currently I have everything makes except the burrner holes this is my setup

I, makes center and it happened to be 2-1/2 inches about where I needed to cut so from the center line I made marks down the bottle 2-1/2 inches off of center, the bottom make is the mark that will be getting cut btw 

In the pdf all it says is this

5. Drill, or cut, a hole in the top (larger part) 2” down vertically from the top and if using one burner 
centered front to back. If using two burners put one about 1/3rd back and the other about 2/3rd 
back. By making this hole down 2” vertically from the top of the form you will have this hole 
positioned so that the burner can enter the fire box at a tangent or level to the floor, causing the 
burning gases to swirl within the forge.

 

If you are going to follow those directions, you are missing the bold part.

How am I missing that part?? I understand how,it needs to go,in I just don't understand how,large to,make the hole

Do you understand that if your burner is tangent to the inside diameter and level to the floor, the top of the hole will be a lot more than 2.5" away from top dead center and it will not be a round hole?

Yes I understand that, my intention was to cut the hole as large as it needed to be then use my dremel to finish the rest of it

Well, then build or by your burners and see how big it needs to be. Personally if I were doing it, the inlet pipe would be the flame nozzle. Others do it differently.

So, u would just have one pipe welded on, and have ur burner go directly inside?

If I was doing it, yes. Others seem to have problems with their flame nozzles burning up, so being able to pull the burner and nozzle out to replace the nozzle is an advantage. I haven't  had that issue. A friend of mine sticks the mixing tube into a hole in the housing and builds his flame nozzle out of refractory. He's built several forges of different sizes that way and all of them are still running. We had three of them going at a meet at his place. Most people here weld in a pipe big enough for their flame nozzle to fit through I think.

Well then since I'm going to use frostys t burner do u think,my best bet would be to do it like u do it?

I have zero experience with T burners.

either way is this what ur saying u would do? Sorry for,that bad sketch

The one marked pipe is the one that would be welded on

 

What you have labeled 'Nozzle' is actually the mixing tube, but yeah, that is what I do. picture coming ,

if it came out.

Ur gonna post a pic? What do u mean if it came out?

So am I correct in thinking that the t burner would replace the part that the red arrow is pointing at?

 

 

Have fun.

what do u mean??

Or would I be better judt using ur setup entirely ?

I would stick with the directions you have from Wayne. Where we get into trouble is trying to mix different designs. Here is the thread on building our forge, which worked for us.

 

First off I love ur design, and yes I think I'm going to use just Wayne's design. This time lol, the next forge will be rocking the t burner tho for sure

Ok so right now what I'm stuck on is the btu I need to knoq how many btus my forge is going to operate at , there will be 2 burners and the orfice hole that letz the propane into the forge is going to be a 3/64 inch hole ive been doing research but some charts say I will be in the 15000 btu range, and some say in the 115000 btu rangs, and also my regulator pressure will be about 10 or 30 psi

Why do you need to know BTUs? The guys listing just BTUs don't really know what they're talking about it's BTUs per SECOND that counts. A BIC lighter will generate hundreds of thousands of BTUs if it stays lit long enough.

You're asking questions about things that don't matter rather than just following a set of plans and building a forge. I don't know if you've noticed but fewer and fewer experienced folk are answering your questions. It's beginning to look like your "quest for knowledge" is an excuse for not just gitting it done.

This is a nonsense question, my forge will melt steel if you're not careful and I have ZERO idea how many BTUs it makes and don't care.

Now stop dinking around and do the job.

Frosty The Lucky.