I've personally seen it done on plate as thick as 2 inch and it worked just fine. Thing is you have to be using a big tip, like #7, and you have to crank the oxygen pressure up around 70 plus to do it. Still I too understand what your saying about using another torch to preheat ahead of another torch on really thick material. When cutting a bevel I can see where this would particularly be needed as the preheat flames from the cutting head aren't directed completely at the plate but rather at an angle to it which cuts the heat input from them tremendously. As far as an actual flat cut on a cutting table goes, if you watch many of them after the preheat phase is complete the torch head will actually rise up from the plate before starting the cut. In rising like this, even though they don't cut the gas off, this removes the small, blue preheat flames from the process as they aren't needed until starting the next cut. Like I said the main thing when trying this is to be able to maintain the correct cutting speed as too fast or too slow will easily kill the cut.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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