This article in Danish reported by the Danish news portal, Metal Supply, gives a good description of CNC Onsite’s Goliath machine employed at CS WIND Offshore in Aalborg to precision-mill the large transition piece flanges. A tolerance of one millimeter is consistently achieved.

Read more:
https://www.metal-supply.dk/article/view/1119628/dansk_produceret_maskine_fraeser_kaempe_flanger_med_millimeters_praecision