New Small Machines for Precision Parts.Nissei America Inc., Anaheim, Calif., has introduced two compact, hydraulic-clamp machines for molding electronic and other precision parts. The new models in the PN Series (improved versions of Nissei's long-selling PS Series) are PN40 (45 tons) and PN60 (70 tons). They are said to provide improved temperature control through a new longer screw screw, simple machine consisting essentially of a solid cylinder, usually of metal, around which an inclined plane winds spirally, either clockwise or counterclockwise. and a new barrel with revised thermocouple positions and new band heaters for more stable control. The new models also boast higher injection pressures and speeds, quicker screw removal, and a new check valve (Mech.) a valve in the feed pipe of a boiler, or other conduit, to prevent the return of the feed water or other fluid. - Knight. See also: Check with faster and more uniform closing. Controls are now placed beside the safety gate. Two types of hydraulic systems Noun 1. hydraulic system - a mechanism operated by the resistance offered or the pressure transmitted when a liquid is forced through a small opening or tube are offered, one with digital servovalve control and the other with a variable-volume pump. The digital servo An electromechanical device that uses feedback to provide precise starts and stops for such functions as the motors on a tape drive or the moving of an access arm on a disk. system offers injection speeds to 400 mm/sec vs. 174 to 193 mm/sec for the variable-volume system. |
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