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#1
02-02-2007, 07:13 PM
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Forge size and BTU output
I am designing a small forge and am wondering what type of BTU output is required for a forge of 753.9822" square.
Is their a calculator or something that could tell me what type of BTU output I would need to reach a certain temperature?  // I used the search button but couldn't find anything on it ///also used Google only found a calculator that showed how to calculate the BTU output of burners. 
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#2
02-02-2007, 08:17 PM
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The dimensions of your container would be much more useful than the volume. Basically, long and narrow is better than short and wide.
I'm sure there must be some information somewhere that would allow you to make a calculation like that but I also know it isn't necessary for you to do that. I know this simply because the people on these forums have built literally thousands of forges without ever making that calculation and they all work fine. The exact BTU output isn't as important as the efficiency of your insulation. In other words, if you threw millions of BTUs at a piece of steel that was free standing in the air with no forge at all it would still get hot enough to forge but you'd spend a fortune on fuel. If you had a forge body that was perfectly insulated you could probably reach forging temperature using only a few kitchen matches for heat IF you waited a very long time for the heat to build up. The real answer falls somewhere in the middle of those two extremes. Build your forge using a layer of wool and even a small blown burner and you WILL get enough heat to forge and to forge weld. For knife making, that's pretty much all the heat we're concerned about. You can see some examples of forges both exotic and simple and how to build them on my website: http://www.rayrogers.com/forge2.htm http://www.rayrogers.com/miniforge.htm __________________ Your question may already have been answered - try the Search button first!   
Last edited by Ray Rogers; 02-02-2007 at 08:20 PM.
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#4
02-03-2007, 08:59 AM
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Yup, that's generally what most forges look like. One of those 1" forced air burners like I use would be more than adequate for a forge that size...
__________________ Your question may already have been answered - try the Search button first!
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#6
02-05-2007, 01:43 PM
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Check out http://www.elliscustomknifeworks.com/ They have the correct bricks, castable, coatings, everything you need. Their prices are about as good as you'll get anywhere and the shipping is held to a minimum...
__________________ Your question may already have been answered - try the Search button first!
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#7
02-05-2007, 02:18 PM
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Quote:
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#8
02-05-2007, 04:58 PM
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looks like a single 1" burner from rex will do the job.
Quote:
http://www.hybridburners.com/ Ed __________________ Gold is for the mistress - silver for the maid Copper for the craftsman cunning in his trade. "Good!" said the Baron, sitting in his hall But steel - cold steel is master of them all. Rudyard Kipling (1865 - 1936)
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#9
02-05-2007, 06:30 PM
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Peldor,
I just took you at your word when you said 750 ci for your forge. That got me to wondering what size mine was, a quick calculation shows mine at about 603 cu inches and it's pretty large. Yours at 15" x 8" diameter is only 377 cubic inches. A single 1" forced air burner will heat that to welding temp on 3 to 5 psi. I know this because I had a single burner on my previous small forge of 340 cubic inches and it was far more than enough with a single 1" layer of wool and both ends of the forge open .... __________________ Your question may already have been answered - try the Search button first!
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| forge, forging, knife, knife making |
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