Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Punching-Apparalus. proached by a screw operating at the tail ends ofthe lever jaws. In the machine (.?/, Fig. 4049) for punching holesin boiler-plates, the plate is seiured to the top ofthe movable table k by means of clamps, and themachine adjusted to the required distance betweenthe rivet-holes. By the motion of the carriage, theplate is brought between the d
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Punching-Apparalus. proached by a screw operating at the tail ends ofthe lever jaws. In the machine (.?/, Fig. 4049) for punching holesin boiler-plates, the plate is seiured to the top ofthe movable table k by means of clamps, and themachine adjusted to the required distance betweenthe rivet-holes. By the motion of the carriage, theplate is brought between the die and tlie punch ;the latter is moved by an eccentric c on the axis of Fig. ?IH|t Punching Boiler-Plates. the main spur-wheel, which is moved by tlie ]iiniouon the driving-shaft on which are the fast and loosepulleys a a. The carriage receives an intermittentimpulse by means of a rock-bar which is set in mo-Fig. 4050.
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