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Posted by Kyle J. on May 26, 2007, 1:17 am
Please log in for more thread options >I am starting to make a gas forge. I have a gas tank (C0 2) bottom that I
>am going to use. The dimensions are 7 3/4" dia by 12".
> What I need to know is that,
> 1--do I need a hole in the back end.
As stated, only if you think you might have a work piece that is longer than
the forge. Keep in mind that while a tightly sealed chamber will hold the
heat better, you need to make sure that the pressure going in is not greater
than the resistance going out your exhaust path. If you seal it too well
then the gas pressure will blow back at the torch. Not fun.
> 2--How thick do I put in the kaowool, I will be using 1" thick wool
I like 2 inches. Keep in mind that the more heat you retain, the less gas
you have to burn. If your insulation is good you can heat a pretty large
volume.
> 3--do I put the shelf on top of the K-wool before I seal it with Rigidizer
I don't think it matters. As for whether you need the shelf at all... the
thinner the work is, the more likely it is to sag under heat so I think it's
a good idea. I'm building a new forge right now and I will be putting a
mizzou bottom in it that is straight and level. Keeping the work from
sagging can be a pain with longer pieces.
> 4-- where would the torch hole be
I find that running it in from the back straight towards the front works
best for me - but you need volume for the the heat to distribute well. A
long narrow tube won't work well. Try to keep the diameter a large
percentage of the length
GA
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