On 02/19/2020 12:02 PM, John Dammeyer wrote:
And soft castings from scrap aluminium like extruded old window frames is a
challenge unto itself. I too use WD-40 for that. Been thinking of just using
a spray bottle with kerosene. Supposed to be just as good and much cheaper.
Ugh, some extrusions are anodized, so a very mushy pure
aluminum (1100) core with a really HARD outer skin.
That is extremely hard even on carbide cutters, and will eat
plain HSS in seconds. Even re-cast, it may contain
some of the aluminum oxide from the anodizing mixed into it.
Jon
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