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  • Fall-of-Potential Ground Testing, Clamp-On Ground Testing Comparison
    On April 14, 2002, a ground resistance test was conducted to compare the results obtained from the Fall-of-Potential 3-Point testing method to the clamp-on testing method. The grounding system consisted of four copper clad rods installed in an approximate 20 ft square. Three of the rods are 5/8
  • Pneumatic clamps save set-up time and operator wear
    for clamp opening, the other for clamp closing) are required for typical systems. For many applications, flexible tubing and push-in fittings are all the attachment hardware required. Many clamps use tie-rod mounted cylinders and steel piping. Computer-controlled systems can employ a clamp cylinder
  • Tips for no-melt machining
    It's relatively easy to machine advanced plastic stock shapes, but you have to know what you're doing. EDITED BY JEAN M. HOFFMAN Semiconductor-equipment manufacturers machine advanced plastic stock shapes such as this fully imidized thermoset polyimide (PI) into wafer clamp rings. With a continuous
  • Measuring liquid levels with LVDTs
    changes from a few inches to several feet. In the typical LVDT level sensor, a stainless-steel float coupled to a nonmagnetic stainless-steel rod is attached to the high-permeability armature core of the LVDT. The 4 to 20-mA loop-powered LVDT position transmitter senses the position of the core
  • PLASTICS REFERENCE GUIDE
    miniature hand extruder contains a plasticizing unit, hot-air blower, rod feed, and electronics in one package. The compact tool from the Swiss firm Leister Process Technologies and distributed in the U.S. by Uneco Systems Inc., Romeoville, Ill., requires no additional booster and weighs only 2.8 kg

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