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Found 94 results

  1. Matt Watson

    Flare Cone question??

    I need some opinions. I have finished the shell of my new forge and will soon be starting to fill it with the insulation. I know its over kill but I'm using 2''Kao Wool with hardener to help support the 2'' ITC 100 HT. The outside dimensions are 14L x 13W x 13H. The final inside dimensions will be 14x5x5 350ci total for a 3/4'' single burner Ron Reil design (might change to a ''Mikey burner'' if I can get the time to go ta a buddy's machine shop to build it). I have been thinking of casting the flare cone into the refractory instead of a standard hole for it to fit down in. I'm thinking the mixing tube will be inserted through the top and 2'' of hardened Kao Wool then the end of the tube would come in contact with the start of the refractory and sit flush against it. The first 1/2'' - 1'' of the refractory would be cast at the 3/4 diameter of the tube then the last 1'' -1.5'' of refractory would be flared as the cone shape ( I thought I would just use a piece of plastic from a milk jug glued or tapped together as the mold to form the refractory around) . I'm thinking doing it this way would allow for me not to have to change flare cone periodically due to heat exposure and cycling. I've included a picture of the shell, material thickness is 1/8''. For those of Y'all that have more experience than me (probably everyone on here) would this work? Would you change anything? What length would you cast the flare cone 1'' or 1.5'' or would it matter? I would just like to have some other people opinions / expert advice before I proceed any further. I can change the interior design if needed or something would work better. I also wondered if maybe an oval shaped interior would work better than rectangular? Or maybe even Bowl shaped? The base is separate from the top so I can shape it any way that I want and for ease of maintenance. Thanks in advance!!
  2. Eventlessbox

    Ugly Metal Box forge

    I give you my Ugly Metal Box. I know its ugly. I have never welded anything other than a few pieces of scrap to get used to the process. This is literally my first time welding, cutting metal (both sheet and angle), using a drill press or a tap. But it is solid and I promise it will not be lit without testing all the gas fittings. All or the parts for the box are salvaged from around my property as were most of the fittings for the burners. And the fire brick was gifted from a friend who had ordered too many while building a kiln. I wanted to share it because even without having attempted anything like this before I was able to slowly make something hideous, but that i am proud of none the less. Videos to follow once i have checked for gas leaks and moved it to a safe outdoor location. I really would appreciate all CONSTRUCTIVE criticism. And promise not to get hurt by it.
  3. Michael Ladas

    forge insulation questions

    Hello,I'm planning on redoing the insulation in my forge (a 20 pound propane tank with a single venturi burner)I'm planning on using ceramic fiber which I understand can be tricky to work with. My questions *Will sealing the blanket with refractory cement (meeco 610) keep fibers from being blown around and offer enough support to keep the lining from collapsing *Is a 2 inch thick sheet over kill for a relatively small forge *Do I need some sort of ridgidizer for the blanket * What kind of resporator do I need to work with the blanket.
  4. Chuckspringfield

    Good "filler" for gas forge?

    Hi guys I'm looking at building my own gas forge and I'm planning on using a small sized helium tank as my forge body. Seeing that I only need an opening of 7-8inches wide and 5inches tall (aprox) I'm wondering what I can use as a filler between the sides of the tank and the ceramic blanket I plan on buying. It would be too expensive to go ceramic blanket the entire way so I'm wondering what, if anything would be a good material to use to build up the sides to my desired size. Would a plaster of paris & sand mixture be acceptable? Any imput is really appreciated! Thanks
  5. Jacob Palmer

    Propane Regulator

    I have recently built a Frosty Tee Burner for a gas forge of mine. Is it absolutely imperative to have a regulator attaching to the propane tank? There is already a valve on the burner. If I do absolutely need one, can someone point me to where I could get a cheap and good one? Thanks, Jacob
  6. RHayes

    One burner first forge

    I found this site a couple weeks ago while searching metal art images. Having acquired a few related tools already, I decided to try making a forge and see where this takes me. The body is 12" casing, the ends from an old water heater, various pieces from the scrap barrel. The insulation material is in and I still need to rigidize and coat it. The plan is to place one K-26 firebrick (possibly coated?) as a replaceable interior base. The brick will end up at the height of the end cut outs. The burner is slotted 3/4" iron pipe with .030 mig tip for orifice. I haven't tried a choke on it as of yet. It lights up and roars pretty good in the free air but testing in the forge is yet to happen. The sleeve around the burner was intended as a bushing to stabilize the burner in the holder. Once the inside gets coated the volume should end up just under 350 cu. inches minus the volume of a 1.25 x 4.5 x 9" brick. I need to get colloidal silica and Kast O Lite coming to complete this. A buddy says he has some castable refractory but I don't want to risk getting something that isn't right. Comments a criticism would be greatly appreciated. Burner size? end openings? ??
  7. bird

    Gas Forge Build

    So there's a lot of talk about building burners and which design is better, but not so much about the box you put the burner in. To me, the box in the more important part. No matter how efficient your burner is, it is the box that will largely determine how hot the forge gets, how quickly you can get to work, how long you wait for heats, and how scaly your metal gets. Here are some of the things I want in a gas forge, and why I want them (Your desires may be different, and you'd want a different design. The design I'll show is not the one I'd build for example if I were a knife maker or if I only had a half-hour at a time to forge.): It should get hot and stay hot when I fill it with metal. Insulation is key, but so is thermal mass. I want enough of a heat sink to make sure the metal heats and re-heats quickly rather than the forge cooling significantly when I add the mass of metal. It should be durable. Who wants to spend lots of time building and fixing forges instead of using them? You should be able to adjust the atmosphere, at least from neutral to rich. Too much oxygen makes heavy scale and makes welding hard to accomplish. The burner matters here, but also, a forge should have doors. Without doors, it is hard to control the atmosphere except by gas pressure, which is wasteful. Doors should not prevent access to the whole chamber when necessary. Why build and heat a volume you can't access? If you use ceramic fiber blanket, it should not be where it can be abraded. If your forge or doors use a steel shell, keep the steel out of the flame path as much as possible. This goes to durability. when your steel burns up, does it expose fiber insulation? Does it open a gap around the burner? Will your roof buckle and cave in when heat gets between the insulation and the shell? None of these are good in my book. Quiet is nice. The shop is loud enough. For all of the reasons above, I cast forges from commonly available refractory materials and use ribbon burners. In the pictures attached, the arch is cast from 3000 degree lightweight insulating castable and the floor and burner head are cast from 3000 degree dense castable. The entire box is surrounded by 2" of fiber insulation. You can't see it on the arch because I made the castings slightly proud of the frax to keep the fiber out of the flame/abrasion path. The casting is also proud of the steel shell so that there is no steel to erode in the flame path and open gaps. This may look like a lot of work, but with assembled materials, it all took well less than three days, elapsed including the stand and plumbing. Not so bad when I have other forges built this way that have lasted close to ten years. For this rather small forge I did push the limits of casting with sections as thin as 1" for the floor but I think it'll hold up and I didn't want it to take forever to heat up. I did build the ribbon burner but there are other people here more expert than I am. It is 2" x 6" with 11 crayola size jets. I used a needle valve on the gas and a homemade butterfly on the air and it is very tunable and quiet. Image notes: 1 have a plan. 2 the base for the casting form. Note 3/8" blocks to lift steel shell off of floor and allow casting to extend beyond the steel shell. 3 the outside shell. Holes drilled are to wire the frax to the shell. Flange secures mold and will ultimately be bolted to stand. 4 outer shell in mold. Note that top of mold is also proud of shell so that casting will go beyond steel. 5-6 the outside of the shell mold. 2x4s support the shell and keep it from bowing out. 7-8 the inner shell- arch form. This will not be part of the finished forge. Don't forget the mold release. 9 the two halves of the mold mocked up. 10 the "core" for the burner. 11 the core mounted and caulked to the inner form. 12 DON'T FORGET MOLD RELEASE 13 the (not yet caulked) burner core fit to the inner arch and through the outer form. 14 opening for the burner core cut into the outer shell. 15-16 the frax wired onto the outer shell, and with the burner opening cut out. Note that the frax is shy of the top and bottom of the steel shell so that in the finished casting the frax will all be encapsulated in castable. 17 the nearly ready assembly. What this doesn't show clearly is that there is a little more than an inch of clear space between the frax and the inner arch. I will ram the castable onto the frax which will compress and compromise it some but will still leave me with more than 2" of insulation all around. 18 the casting in the mold. Be sure to really ram the castable into the bottom to fill in the lee of the burner core. 19 very simple mold for the floor. 1/2" plywood core makes the lip on which the arch will rest and gives me a seamless floor. 20 the floor casting sitting on 2" fiber board. (forgot mold release: cracked casting slightly. Sairset to the rescue.) 21 dry stacked and ready to burn in gently. 22 Ta daa. Bright lights mess with photography but it really is that hot. Forge floor is 8" x 12" and the opening is small enough to use a brick for doors. I'll probably eventually build doors that are easier to move around but I can get to work for now.
  8. K-9JAX

    St. Helen's Inferno Forge

    Hi Everyone, Looking to buy my first gas forge. Making my own forge is just not something I want to take on at this time. I am planning on making knives. I was initially looking pretty hard at the Diamondback Ironworks Single Burner Knifemakers forge. I then came across Gizmo's Fabrications St. Helen's Inferno Forge. This particular forge has some options to choose from. One of which is burner placement. You can have it vertically or horizontally. In doing some research on this site, I found discussions on burners mounted vertically or on an angle (both of which still has the flame hitting the floor of the forge). What are the benefits (or non-benefits) of having a horizontally mounted burner? Also, does anyone have any experience with Gizmo's Fabrications Forges? I have read some people's opinions on Diamondback Ironworks forges on this site, but I was unable to find anything about Gizmo's forges on here. Thanks!
  9. SwampFox Rocketry

    Share your home made gas forge.

    Here's my gas forge build its made of a 40 dollar air compressor tank. Has two mikey style burners which the kind folks on here have help me improve, and 2 inches of kaowool with rigidzer and refactory. Its inside deminsions are 18 in length 7 inchs wide and tall. I had to order some more refractory and will be finishing shortly.
  10. Hi Guys Finally got around to finishing up my new gas forge. More of a Blue flame coming from the mouth of the forge. Does this look right??
  11. EspenL

    Planning my first gas forge

    Hi, this is my first post here. First of all, thank you for an impressive amount of information. I have been reading through most of the pinned threads here and am deligted to find so much good information. For those of you who don't care to read a long post, please skip to the text in bold below. This is what I really want to get input on. I have started a rather slow process of getting started with blacksmithing. I am not in a rush as it is winter and I am yet to build a new workshop since we moved. Most things are clear to me by now, but getting the materials is a real pain in the neck here in Noway. We have a very small domestic market, and since we're outside the EU many products are expensive to ship. I have located reasonable sources of most of the things I need. Some I will order from Wayne here at the forum and some I have found on ebay. But the refractory I would like to get here. I have not been able to find anyone selling Cast-O-Lite 30, but there is a local producer that makes a product called Borgcast 85. It compares well to Cast-O-lite 30 in most aspects apart from the thermal conductivity: 1.9 W/m*K at 1000C for Borgcast 85 vs 0.65 W/m*K for Kast-o-lite 30. Can anyone comment on whether this will be an issue? I am planning to insulate with 2" Kaowool, but am worried about the liner becoming a heat sink if I use Borgcast 85. For those curius, here are the rest of the numbers: (Borgcast 85 vs Cast-O-lite 30) -Alumina content: 83% vs 56.6% for for Kast-o-lite 30. -Maximum recommended temperature 1700C/3092F. vs 1650°C/3000F -Permanent Linear Change Borgcast 85: - after firing at 110C: 0% - after firing at 1200C: -0.3% - after firing at 1400C -0,4% - after firing at 1600C: -0,4% Kast-o-lite: After 220°F (105°C) Nil After 1500°F (815°C) -0.2 After 2000°F (1095°C) -0.2 After 2500°F (1370°C) +2.0 After 2910°F (1599°C) +1.0 -Modulus of Rupture and Cold crushing strength CCS: 130MPa vs 17.2MPa for Kast-O-Lite 30 MoR: 16-20 vs 5.5MPa For the rest of the forge the plan is as follows: Shell: Helium tank or other empty vessel I can get hold of. Gas tanks are expensive here (>$100), so that is not an option. Insulation: Kaowool from WAYNE COE Rigidizer: Fumed silica from ebay (Cab-O-Sil M5). Dissolved in water with food coloring and spritzed on the insulation. Then fire with the burner to set. Kiln wash: Plistix IR reflective from Wayne, or Zirconium silicate (Zirkosil) from a domestic provider. Burner: Black pipe and fittings are not easy to get here. We use plastic for water pipes and there is no residential gas. In an eager moment I bought a 1" burner from Alec Steele. Yada yada! But I found his site first, and it was his enthusiasm that eventually brought me here! I later realized that I could probably buy stainless pipes and fittings from china and make one myself for much cheaper, but done is done... Regulator: Propane regulator from local gas supplier. Using 11L barbecue tanks it will supply up to 30 psi and a bit more than 2kg per hour. Using industrial tanks is as far as I understand not practical/possible for private persons here. I am in any case limited in tank size, as the tanks have to be carried up steep stairs from the road. If I get trouble with freezing I can connect two tanks in parallel. I have verified that parts for that are available here. Hoping I have done my homework well, and looking forward to your input! Borgcast 85.pdf
  12. Good afternoon. First I would like to say thank you for your time also that I am quite new to this website. I have indeed read over many many forums or blogs on here. Aside from all my blacksmithing books, I find this website really informative, educational and also entertaining. I started collecting materials so I can do some smithing in my spare. In which fluctuates throughout the year. I'm pretty sure I can build this new forge I have in mind. I am just looking for more experienced advice and criticism from some of the Pro's around this website. So if anyone has any input it would be appreciated very much. Questions 1. I have seen many forge shells. In which vary in wall thickness. From thin sheet metal to 1/4 inch or so thick. I have a few 16 gauge 12x24 inch sheets of mild steel. I want to make a Mobil unit. One I can take anywhere without too much hassle. Is 16 gauge realistic to make a forge shell with? 2. I have 2600°F rated ceramic wool insulation. 1x12x24 blankets. I want to wrap 1 piece around the side walls and floor of the forge. Placing a fire brick on the floor of the forge but on top of the layer of ceramic wool. Making a U shape with a brick in the middle pretty much. I would like to be able to forge weld eventually. That's why I planned for putting a fire brick at the bottom. As I've read fluxes eat ceramic insulation like no ones business. Would 1 inch of this ceramic wool be ok for this forge? with the outside dimensions being 7x7x12 and the inside dimensions with both C.W and fire brick coming to 3.5x5x12 inches. I believe that's a total inside volume of 210 cubic inches. Small enough to use a single atmospheric burner. 3. Now. I just got a pint of ITC-100HT shipped here. I do not want to waste a single gram of this stuff though. So I'm just trying to make absolutely sure I plan this out as well as I can. Treating ceramic wool is a must. Especially from the horrific things I've read about not using it properly. To treat or prep my insulation. I need to seal the c.w. do I NEED rigidizer? Is it a must have or can it be worked around. HYPOTHETICALLY could I use hi temp stove and furnace cement made into a slurry or watery paste to sort of paint over the ceramic wool with. Until desired thickness is met. Or should I order something that specifically says refractory cement? All I have locally unfortunately is imperial hi temp furnace and stove cement and some Rutland fireplace cement. Both temp ratings are a bit different. In which doesn't make me feel very confident in really using. But that's why I am here asking you guys and gals. I've herd of plistix, kast-o-lite, k bond, satanite etc 4. What is the difference between refractory cement and furnace cement? 5. Could I use itc-100ht by itself to rigidize and or seal the ceramic wool? Or would that not be enough protection. 6. I have heard about gas forges needing a draft for better functioning. I have designed a basic shell with open ends. Openings being 3.5x5 inches. Could I just use firebricks to close the openings. Or would insulated doors be a better option? I have a possible sketch or draft of doors for my forge. The front door would be have an opening of 2x5 and the backside opening being 1x5. I figured I could plug the access openings up if I needed to by using firebricks. I tried uploading some drawings I have made of the forge I would like to make. I apologize for the lengthy questions. I understand not everyone likes to read novels. But genuinely appreciate your time and appreciate any feedback you may have.
  13. I'm making my first gas forge and I'm having trouble finding some of the supplies. My first question is what material should I use for the burner bracket? I've tried looking around but I couldn't find anything about what to make it out of. I'm also going to be building Frosty's T Burner and I'm having a hard time finding the black iron nipple pipe. Any ideas what stores or type of stores to look at for the black iron parts? Thanks in advance.
  14. How would yall insulate this forge? 1 or 2 x 3/4" burners? •12"L x 6"W x 6"T inside finished demensions • sliding front door (up and down) fire brick for pass threw on back •covered in 1/8" mild steel with 1/4" wrap around mild steel for sliding work into and out of forge and storage on side • expanded metal shelf underneath • hanging rack on one side for tools This is my first forge and there are so many different ways to insulate it I wanted to know how yall would do it? I' looking to be able to get to forge welding temps for damascus work one day. Also wanting to build one sword for myself (hints the pass threw). What also like this to consume the least amount of propane as possible. What are your suggestions on things I should change or things I should add I have roughly a $200 budget which can be fudge to little bit not including the burners or the 1/8" or 1/4" steel for the outside. So $200 for insulation purposes. Please excuse my hands scratch on the drawings (there's a reason I don't write papers for a living).
  15. Finally got my gas forge up + running! Have a standard 20# grill tank on it and have been considering a larger one but am looking for advice. The 20's are readily available & easily refilled, but don't last real long and can freeze up. Been thinking of either a 30, 40, or 100# size- I like the capacity of the 100, but have a few reservations and would like to hear others experiences.
  16. Theintegrator

    New forge complete

    I fiinished forge 1.0. Details: propane tank, 2 inches of kaowool, lotsa stiffener (sopping wet is right) and a layer of kastolite. Frosty 3/4 in t-burner. Here's what it looks like. Any comments? I also have a regulator question. Mines an adjustable unit, bell-shaped with a wing nut to control psi. I'm not sure exactly what I'm doing when I twiddle that wing nut. I'm going by sound mainly, so when it roars I figure it's workin. Be nice to know what I'm doing. Sorry if the pic's too big.
  17. Hans Richter

    Hello from Belgium

    Hello from Belgium, Glad to be part of the IFI community now. Found a very interesting forums and lots of knowledge around technic, skills and practices. Here a short introduction of myself. After professional education (maintenance mechanic) and after several years work/training in a lock/black-smith shop, finally running my own BS-shop for 9 years on a historical Dutch shipyard. Because of health reasons and funding a family I rest de shop and went back to school for studying quality- and work safety management. Since about 17 years I’m busy on payroll now to make a living in SHEQ-business within the metal industry . Next to that I work freelance as an IWC-S consultant to give welding advice to small metalworking companies. Al this time I keep my basic blacksmith equipment (tongs, hammers, fullers, swags and coal forge) without using it. About 1 ½ years ago I reactivate the equipment in a small barn in my backyard and now I’m forging again. In the last couple of months however the activities and goals are rising up and I build my own 55lbs power hammer and also a gas forge with a twin set of Venturi jet burners with many thanks to the oversea blacksmith community at forums and on Youtube. Still try to become familiar with the non-metric measurements. Like to forge many items like chandeliers, fire pokes but also knives, axes and more. At the moment I struggle with the fine tuning of power hammer (insufficient air release at foot switch) and forge (becoming higher temperature >1750°F ), and also hoop to find many useful information about Damascus steel. Cheers, Hans
  18. James Conyers

    Question on castable refractory

    Hello again, I've had some time to do research on different kinds of refractory material and I really like how the Kast-O-Lite 30Li sounds at first glance. I was wondering if I should coat the Kast-O-Lite in an IR refractory like ITC-100 (a little too pricey for me...) or Meeco's Red Devil 610 refractory cement (well with in my price range but unsure about efficacy). I have attached a ROUGH drawing of the front of the forge. Here is an overall idea of what I'm shooting for: Brushed stainless metal trash can for the shell (H=12" Dia=8") Hoping to do 2" of Kast-O-Lite to make a chamber of about 4" x 11" and have an exhaust port at the rear about 1.5" Hard fire brick as the floor (4.5"x9"x1ish") No refractory on these. Planning on having the burner pipe cast with the material then holding it in place with bolts. What say you fine folks? Any and all wisdom is greatly appreciated. I'm hoping to get this bad boy up to welding temps but we'll see. As always thanks for all the advice. Cheers! Big Jim (p.s. please excuse the horrible drawing in the image... I swear my 6 year old can draw better than me) Oh and I was also thinking of using the lid as a door to make the front opening smaller to retain more heat when I'm trying to weld. Kombae! Big Jim
  19. Majidii

    Insulation wool

    If the only store that sells insulating wool not have ceramic wool but they have fiberglass wool, would that be cool or would that be a terrible idea? Any alternatives. Also just for fun, any fun or cool/wacky forge ideas that works surprisingly.
  20. konvit

    New Forge needs some help.

    I have been doing forge work for many years and have a great coal/charcoal forge. however due to time constraints I decided to branch out into gas forge work as the heat up and cool down times are drastically reduced. after getting the materials and working with a friend to build the forge I realize now that its going to need some modification to work as needed. To begin with this is a double burner forge utilizing a high pressure regulator with a 0-10PSI valve. the original design was to make this forge on a pivot so it can be turned upright to be used for the large crucibles I have to do scrap recovery and smelting. the overall interior is 19 inches deep X 9 inches wide. the dual burners have a top insertion and have several air inlet holes. so the first issue I ran into is that the forge was getting too much or too little air. the burnner uses a .35 mig tip after i got the air issue resolved I was able to get it fired up and looks to be working. only a bit more dragons breath then I would like. I realize I need an exhaust port. this was built so the bottom/back can be removed for long works so i can remove that however the full opening would allow too much of an exhaust. so I need some help to get a modification design for an exhaust port and to find out if the design should work with a basic air inlet i have or if i need to look at a forced air inlet.
  21. Hi everyone. I recently bought a devils forge single burner forge for some of my smaller projects. I've tested it from less than 0.1Mpa to 0.8 Mpa. The issue is the forge doesn't get hot enough. Or if it does it's a huge fireball coming from the forge. Also, I keep reading about some kind of coating I need to put on the wool? Any info on that would be appreciated!
  22. SandHuf

    Getting a Gas Forge

    So I have been using a hand crank coal forge for some time now and have been getting tired of starting and maintaining the fire. I've been looking into buying a gas forge and have looked at Majestic Forge and Diamondback forges. After reading some threads in here I decided magestic was poorly made and couldn't weld easily. I looked at Chile ones too but that is out of my budget. I want to know if any of you have had problems with a diamondback Forge (I want the 2 burner blacksmith model). Or if you think it would be worth my time and money to just make one and buy the burners then any advice on insulation would be great. Also, I want a forge that can do some good welding. I want to try some Damascus in a few months.
  23. NomenCallide

    Mini gas forge

    So I am building 2 forges, one from an old wok that burns wood, and one from a large pizzeria sized pineapple chunk can and I'm wondering if anyone knows of a place in the St. Catharines ON area to procure some kaowool on the cheap, or alternately is willing to sell some on the cheap. All advice is appreciated! Also, what is the best way to seal the kaowool?
  24. Rubyoffthe

    First Gas Forge Design

    Hi! I'm a reenactor who has decided to build their first forge. I've done a bit of work on coal but for working at home I decided that gas would be the much easier choice. I read the thread on Forge 101 and it warned about not starting too big but now I'm worried as to what you guys consider "too big". The size of what I've drawn up (diagram below) is based on the size of the things I need to be producing for reenactment (mostly larger axe heads) but please let me know if you think I've been too ambitious. The burner I'm planning to use is the 1" gameco bkit3 burner. All sides of the steel box in the diagram will be lined with 2 inches of kaowool and one inch of refactory cement. And it will stand on a base of the same. This gives an internal size of 10" x 10" x 5". If anyone can see any problems with this I'd love to hear them and I will adapt the design accordingly because I want to get this right. Many thanks Ruby
  25. Hi, my name is Jim. I am 37, a father of a two & three year old. I am a carpenter by day & well a busy father after. As my life is chaotic and I'm always busy either with work or taking care of others I needed some serious me time! So the adventure began, first it was straight razors but that just wasn't enough for me. I buy, sell & restore them. I got involved with the forums but I don't feel as if I actually fit there. I have nothing bad to say it's just you can't fit a square peg in a round hole. Now after taking a serious interest in blacksmithing & after long careful consideration I started buying tools. As I stated in a father and everyone knows that means "on a budget" so I bought a used 70# anvil without a makers mark, the only mark it has is on the left foot a 7 stamped in there. I paid just over a $1 per pound. I'd like to I.D. It but I have so many more important questions, like #1 being I have bought a forge to save time and hey the price seemed right ($130.00) it came with a 1" Rex burner and the forge inside diameter is six inches round by twelve long, made with refractory cement and by eye I'd say near 1/4 inch plate steel. So from what a have read it seems the burner is more than sufficient for the space. My question is do you think this will work out well and most importantly how do I tune the burner? I have played around with different air/fuel ratios and I just can't seem to get a " jet like" blue flame. In fact all I'm getting is a weak flame or I get what appears to be an invisible yet loud flame? I can't help but wonder if I should have went with coal?? Anyway I am going to end it here as I have so many questions I don't want to over load one post. Any help getting this burner flowing right and opinions on my setup even constructive criticism is welcome. I just want to learn & learn the right way. Sorry that I'm all over the place but I wanted to introduce myself and get my first questions out. Thanks, Jim.