unbalanced jet drill bit

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Milling cutter — Milling cutters are cutting tools typically used in milling machines or machining centres (and occasionally in other machine tools). They remove material by their movement within the machine (e.g., a ball nose mill) or directly from the cutter s… … Wikipedia
Drilling fluid — This article is about fluids used when drilling a well. For fluids used with drill bits during metal working, see cutting fluid. Driller pouring a foaming agent down the rod string on a drilling rig In geotechnical engineering, drilling fluid is… … Wikipedia
Drilling mud — In geotechnical engineering, drilling mud, also known as spud mud (when beginning the drilling process), is a drilling fluid used to drill boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling… … Wikipedia
List of Kururu's inventions — Many of the storylines in both the manga and the anime versions of Sgt. Frog happen thanks to Sgt. Major Kururu s knack for inventing. His twisted nature combined with Keroro s need to conquer Pokopen/Pekopon work fluidly together, as it gives… … Wikipedia

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