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• #52
I thought that both alu and steel had more-or-less constant coefficients of thermal expansion over the range of temperatures you can achieve in a garage... but I can't find any nice graphs, so feel free to set me right.
Saw a google answers thing suggesting that heating alu inside steel might crush the alu when it expanded, making it easier to get out when it contracts again, which sounds (more) plausible.
Anecdotally - heating never worked for me, though cooling has done.
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• #53
i've never had any fluid, anomina caustic etc. do anything to get a totally jammed post out.
grind top off and pad saw down inside - it doesn't take that long
Caustic soda will get any post out with time.
But steel expands at a lower temp, hence why heating works