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  • Users: rfdesign1
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  1. rfdesign1

    Impossibly tangled springs. How should spring be redesigned?

    Hi, The dual compression coil design shown works great. In assembly it is tightly surrounded by plastic molded parts and provides electrical connectivity between a battery and a circuit board. Problem is that when received from the spring mfr, these parts are incredibly difficult to separate...
  2. rfdesign1

    Calculating 'Effective' Shore Hardness

    A piece of rubber the size of 4 stacked quarters is needed for shock/vibration protection of electronics. It has been determined for the application that a Shore 'A' hardness of 35-40 works best. Due to mass constraints, the rubber is too heavy. Is there a method to calculate the EFFECTIVE...
  3. rfdesign1

    Does this compliant material exist?

    I am not a materials engineer. I am looking for a compliant material with the following qualities: 1. Shore 'A' hardness of 30 - 50, preferably 35-40 2. Density of 0.5 oz/cu in (0.86gram/cc) 3. Able to be produced in a hemispherical shape of radius 0.85" inch, with a hollowed out hemispherical...

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