> Cast Iron is easy to machine, but a bit messy, black dust
> flying all
> over. I don't understand your reference to Al and
> gear cutting loads.
I meant I would not trust the structure of the 4th stage being made from Al.
Al creeps, thus never really returns to it's orig shape when placed under load.
If I have to make my own 4th stage, I'm deciding which material to use. I can
get steel, but I was told to avoid steel as a machine tool body because it's
easy to establish acoustic standing waves in that material while iron damps
them out. Which was the reason I understood machine tools are made from iron.
Andrew
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