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@azonenberg The main driver was so I could machine elliptical and offset-parabolic reflectors, plus things like laterally-displaced ellipse Gregorian antenna systems at mmWave frequencies, and slot arrays with hundreds of elements. The stress of doing manual machining for even a 2 x 24 slot array at 10 GHz is way too high, so 100+ precision slot arrays are best done on machines. Same with making batch runs of waveguide parts