55, although it may seem counterintuitive, heating the bolt rather than the surrounding material works. The thing to remember is you're trying to disturb the bond between the threads in the fastener and the threads in the hole. Moving either one will break that bond. It is MUCH easier to get the fastener hot enough to expand than it is to get the surrounding material to expand. Not only is there much less material to heat, the thread corrosion serves as a insulator to concentrate the heat in the fastener.
This method works particularly well with aluminum castings. Try to heat an aluminum casting hot enough to release a steel fastener, and you're likely to blow a hole through the casting. On the other hand, you can apply a lot of heat to the fastener without worrying about the aluminum.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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