I got lucky with a torch once. As you all know to get a cutting torch to cut you have to pre-heat what you want to cut. Over time I noticed that rust makes a reasonable heat insulator - like pre-heating something attached to something else that is rusted, the heat has trouble passing through the rust to the other part. I had a broken stud in an exhaust manifold (I think it was the one that connects the pipe to the manifold) that I could not get a drill near and didn't want to take it off because I was too lazy to pull the manifold off. Because everything was so rusty I thought maybe, if I went carefully, I could pre-heat the stud without heating the manifold itself, then the cutting jet wouldn't cut into the manifold and just blow the stud out. Believe it or not it actually worked! Blew the stud right out of the hole and didn't touch the manifold. Cleaned it up with a tap and it was good to go.
phil_n
This post was edited by phil_n at 18:27:13 03/03/15.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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