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  1. rfdesign1

    Impossibly tangled springs. How should spring be redesigned?

    Thank you all for your guidance. The tackboard sounds interesting. Is it sticky? Can you direct me to a specific product? Thanks again, Dave
  2. 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...
  3. rfdesign1

    Does this compliant material exist?

    Thank you btrueblood for all the information. There is no exposure to water, heat, or chemicals except for exposure to curing polyurethane. I've been distracted lately evaluating Thermoplastic Elastomers (TPE) options, but finding that the 0.350" thickness of the part is problematic in terms...
  4. rfdesign1

    Calculating 'Effective' Shore Hardness

    Yes, looks like DMA data is what I need. Are there test facilities that can test a material for me to determine the storage vs loss modulus? How should I search for them?
  5. 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...
  6. rfdesign1

    Does this compliant material exist?

    Thank you btrueblood. Is the foaming for achieving desired density in urethane expensive? Is foaming finely consistent throughout the part (no large voids)? How do you manipulate the Shore 'A' hardness of urethane or rubber? Is rubber typically poured, injected, or stamped into a mold for...
  7. rfdesign1

    Does this compliant material exist?

    The type of material does not matter. Hardness, density, shape, and cost matter. Thank you
  8. 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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