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by Glenn Blaylock on February 7th, 2007
The hole will grow in size proportional to the piece of steel. This is a characteristic that manufacturers use in making very high-performance machines. They will machine a hole in a part that is just a little bit too small for the shaft that is supposed to fit in it. Then they heat the part to make the hole bigger and stick the cool shaft into the expanded hole. When the whole assembly cools back down the piece holds onto the shaft as well as if it had been welded on, but without the imbalances and imperfections inherent in welding. From this point on, you can't selectively heat the part without also heating the shaft, so both will expand and contract at the same time, thus maintaining the tight grip. When I had this explained to me in a physics class it was specifically in connection with the manufacture of jet engines. This is how the turbines are attached to their shafts in such engines.
by tekkie2800 on February 7th, 2007
I would guess that since thermal expansion causes outward expansion in all direcions, that the hole would probably increase in size. This increase would be negligible though and possibly nearly impossible to measure.
Disclaimer: I'm not an expert, this was simply a slightly educated guess. Feel free to disagree.
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You're reading If a piece of steel at room temperature has a hole drilled in it and is then heated, what happens to the size of the hole? Does it shrink, grow, or stay the same?
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