Computer-controlled Milling
![Green Bank Machinist Roger Dickinson](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeGBdrillingeng2_large.jpg)
Green Bank Machinist Roger Dickinson places the drill head of his milling machine exactly where he needs it, and then will tell the computer above him to use that as a guidepost for a set of precision holes on this phase guide.
Credit: B. Saxton, NRAO/AUI/NSF
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