  thumb|power press with a fixed barrier guard  thumb|a haco cnc hydraulic press brake thumb|a press brake bending a sheet of steel a forming press, commonly shortened to press, is a machine tool that changes the shape of a workpiece by the application of pressure. presses can be classified according to * their mechanism: hydraulic, mechanical, pneumatic; * their function: forging presses, stamping presses, press brakes, punch press, etc. * their structure, e.g. knuckle-joint press, screw press * their controllability: conventional vs. servo-presses ==an example of peculiar press structure: shop press== a simple frame, fabricated from steel, containing a bottle jack or simple hydraulic cylinder. good for general-purpose work in the auto mechanic shop, machine shop, garage or basement shops, etc. typically 1 to 30 tons of pressure, depending on size and expense. classed with engine hoists and engine stands in many tool catalogs. ==some examples of presses by application== * a press brake is a special type of machine press that bends sheet metal into shape. a good example of the type of work a press brake can do is the backplate of a computer case. other examples include brackets, frame pieces and electronic enclosures just to name a few. some press brakes have cnc controls and can form parts with accuracy to a fraction of a millimetre. bending forces can range up to 3,000 tons.press brake tonnage table, american machine tools co. web site (http://www.americanmachinetools.com/pressure_table.htm). retrieved 7-26-14.press brakes, pacific press technologies web site (http://www.pacific-press.com/brakes.html). retrieved 7-26-14.parker, dana t. building victory: aircraft manufacturing in the los angeles area in world war ii, pp. 29, 83, cypress, california, 2013. isbn 978-0-9897906-0-4. * a punch press is used to form holes. * a screw press is also known as a fly press. * a stamping press is a machine press used to shape or cut metal by deforming it with a die. it generally consists of a press frame, a bolster plate, and a ram.parker, dana t. building victory: aircraft manufacturing in the los angeles area in world war ii, pp. 87, cypress, california, 2013. isbn 978-0-9897906-0-4. * capping presses form caps from rolls of aluminium foil at up to 660 per minute. ==an example of peculiar press control: servo-press== a servomechanism press, also known as a servo pres
Machine_tools Metal_forming Presswork