Using a propane torch for cutting, choose the proper tip size for the metal your cutting, to light the tirch turn on the fuel ( propane ) when the torch is lit adjust the gas flow until the flame just begins to leave the tip now open the oxygen valve oin the torch just enough that the flame makes contact with the tip.



Now you'll see the cones form at the base of the flame, should sound like tearing paper.

Acetylene, light the fuel then turn it up enough os that the black smoke dissisipates, your ready to give the torch oxygen your ready to cut, once the cut has begun angle your torch towards the direction of the cut, if your cutting heavy metal the degree od angle will be much less than that for light guage metals.

I used a number 4 tip the centre hole large enough to fit a pencil lead, using this tip a skilled burner can cut upwards of six inch thick metal, round shafting is the most difficult to get started on a cut.