Yeah, we almost never machined any part that was bigger than 18 inches. Mostly aerospace parts. We didn't get the full plans so I don't know what they went into, just that they were for clients like Rockwell, Northrop-Grumman, Lockheed, etc. Some of them were very expensive polymers like Dupont Vespel. Back then that shit cost almost as much as gold by weight. Not sure how much it costs today.
I haven't played around with plastic yet.
Mag, inconel, hastealloy, waspalloy, titanium etc.
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