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  • Turn of the Screw: Rolled & Ground Types Inch Closer Together
    Usually when engineers think of rolled screws, they think of something that isn't very precise-with lead errors in the neighborhood of 0.01 inch per linear ft. Not any longer. Engineers at Nook Industries have reportedly come up with a way to thread roll screws with a lead error of just 0.0001 inch
  • Worm Gear Ratio of Model 520 Geodetic Platform Tiltmeter Legs
    To level the X- and Y-axes of the Model 520-W Geodetic Platform Tiltmeter, the user turns a knob that raises or lowers an invar screw by means of a worm gear assembly. One complete 360° turn of the knob turns the screw by 6°, or 1/60 of a revolution. The ½-inch diameter screw has a pitch of 40
  • Superior Superabrasive Wheels and a Cost-down Strategy Pay Off in Round Tool Grinding Operations
    , materials and machines, these wheels are reducing cycle times and lowering wheel-dressing requirements. That level of performance, in turn, is reducing total grinding costs by as much as 30 percent compared to other "high-performance" wheels. For example, in the machining of one-inch diameter, five
  • Smart Computing Article - Scanners
    around this annoying problem. Sign your name in black or dark blue ink on a clean piece of white paper. Set your scanner to the line-art or grayscale setting and scan the signature at 180 dots per inch (dpi) or higher. For best results, set the
  • Medical Device Link .
    a measure of material stiffness is typically several hundred thousand pounds per square inch (psi) for many unreinforced thermoplastics; in contrast, the flexural modulus of aluminum is 10 million psi. Many applications require the rigidity of metals and thus cannot use these unreinforced

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