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  • Have ball screws become a commodity?
    on a threaded shaft. Balls recirculate in one of two ways: through external tubes that transfer the balls from one end of the nut to the other; or with internal deflectors that divert balls to the next thread or down the entire length of the nut. Ball screws with external-tube return systems cost less
  • Variables of Pin Transfer (.pdf)
    Pin transfer is a way of selectively depositing a semi-solid or liquid material (like a solder paste or ball-attach flux) onto a substrate. It is commonly used to apply flux to BGA (ball-grid-array) pads to promote subsequent solder sphere attachment. Pins are dipped into a reservoir of material so
  • Fluid Transfer Valves
    Fluid-handling devices are not basically concerned with the modulation of power, but only with the movement of fluid. Choosing a fluid-handling valve used to be easy, because each one had its own area of utility. For on-off, full, or no-flow requirements, ball and gate valves were favored; where
  • Rotary Knife Cut-Off System
    of two conveyors, a transfer slide and lift/gripper mechanism similar to the diagram shown. Equip each conveyor and ball screw transfer mechanism with the Emerald Series SERCOS servo packages controlled by the EMC-2100 Emerald automation controller. Establish a communication link to the packaging
  • Pick & Place Conveyor System
    of two conveyors, a transfer slide and lift/gripper mechanism similar to the diagram shown. Equip each conveyor and ball screw transfer mechanism with the Emerald Series SERCOS servo packages controlled by the EMC-2100 Emerald automation controller. Establish a communication link to the packaging
  • How to make bearings last in electric motors
    Creating the best possible operating environment lessens the chance of premature bearing failure. Here are some basic guidelines. A deep-groove ball bearing installed on the output shaft of an acinduction motor. The motor end cap supports the bearing outer race. Characteristic fluting caused
  • MICRO: Products In Action
    Ball-Valve Seal Solution Eliminates Coolant Leakage Problem Perfluoropolyether (PFPE) fluids are gaining acceptance in a variety of semiconductor applications, particularly as coolants in heat-transfer systems in which fluid must be circulated between a process tool and a chiller. The increased use
  • Secrets of Accurate Machining
    of a ballscrew- powered carriage on a numerically controlled axis. Likewise, a linear encoder attached to the carriage can do the same. Ball screws must perform two tasks: As the drive system, it must transfer large forces to move the slide. But as the measuring device, it is expected to provide

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