Machinery is used to create and finish parts in machining tasks. Milling machines progressively remove material from workpieces to create features on them. Drilling machines make holes in workpieces. Lathes remove material from rotating workpieces to shape and size them and to add features such as threads. Hydraulic presses apply strong compressive force to flatten, straighten, stamp, or bend workpieces. Sheet metal fabrication machines form and shape metal into parts. Buffing and grinding machines sharpen or soften edges, polish or smooth surfaces, and shape material. Marking machines permanently etch text or images onto surfaces. Electric tapping machines create threads in holes.