Flames below the work piece when cutting and the relation to wood

Hello all, I was hoping to start a little discussion regarding flames below the work piece, what causes them and what is a good way of getting rid of them. What I understood is things that can cause flames is using no air assist, which I am not doing of course, a build up of flammable gasses because we are burning wood and/or excessive use of glue or other chemicals in the wood - usually with lower quality (ply)wood. The background is that I recently rebuild my DIY machine with a lot of upgra

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