My Forge

F

Flagg

Joined
Jul 31, 2017
Messages
72
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Photo of my propane forge, I hope.

It heats up well.

The inside bricks are the proper ones i am told, the outside ones are out of a storage heater.
 
What burner are you using and what is its orientation?

My (fairly limited) experience is that a purpose-built HT forge really benefits from very precisely-adjustable fuel:air control. It can be a blown burner with fine adjustment on both air and fuel, or it can be a Naturally Aspirated burner with a screw-adjustable choke. I use a British-made NA gas mixer (an "Amal atmospheric injector". For anyone going that route, the ones factory-jetted for Butane work better in Propane forges than the ones factory-jetted for Propane) which has BSP threads, so may not be user-friendly for those in the USA.

The cheaper range of Devil Forge NA burners have a screw-adjusted choke and will do the job. Their more expensive "pro" burners have sliding chokes. Sliding chokes are really frustrating and the tendency is to make adjustments which take the temperature too high, then too low, almost continuously.

By choking down a NA burner or greatly increasing the fuel compared to the air in a blown burner, the mixture becomes very rich and the flame temperature reduces. Lots of Carbon Monoxide is formed, so the forge needs to be used outdoors (death tends not to improve your knifemaking). The extremely rich mixture reduces scaling and seems to reduce decarb as well.
 
timgunn1962 said:
What burner are you using and what is its orientation?

My (fairly limited) experience is that a purpose-built HT forge really benefits from very precisely-adjustable fuel:air control. It can be a blown burner with fine adjustment on both air and fuel, or it can be a Naturally Aspirated burner with a screw-adjustable choke. I use a British-made NA gas mixer (an "Amal atmospheric injector". For anyone going that route, the ones factory-jetted for Butane work better in Propane forges than the ones factory-jetted for Propane) which has BSP threads, so may not be user-friendly for those in the USA.

The cheaper range of Devil Forge NA burners have a screw-adjusted choke and will do the job. Their more expensive "pro" burners have sliding chokes. Sliding chokes are really frustrating and the tendency is to make adjustments which take the temperature too high, then too low, almost continuously.

By choking down a NA burner or greatly increasing the fuel compared to the air in a blown burner, the mixture becomes very rich and the flame temperature reduces. Lots of Carbon Monoxide is formed, so the forge needs to be used outdoors (death tends not to improve your knifemaking). The extremely rich mixture reduces scaling and seems to reduce decarb as well.
Click to expand...
 
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This is the gun, pipe and regulator I already had, I explained to Bullfinch what I was hoping to do and they sent me a powerful nozzle which works.
I have the torch fully open in the front of the forge and loosen a brick to get air.

I have to do everything the cheap as I give all my income to Mac, I do not even take out my expenditure, frugality is uppermost in my mind or I could not proceed
 
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