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  • Users: edrush
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  1. edrush

    Shigley and spring presetting (aka set removal) under fatigue conditions

    Shigley's Mechanical Engineering Design (5th, 9th and 10th editions) say "set removal should not be used when springs are subject to fatigue". It provides no explanation. I am working on a helical compression spring and this confuses me. The residual stresses created by presetting should...
  2. edrush

    Tramlining and Tire Design

    I have handling problems which I am convinced are related to my tires. I get an incredible amount of steering feedback, tramlining & sensitivity to any groove or rut in the road, a pull to one side depending on the camber of the road, some bump steer, and in spite of the tendency to wander, it...
  3. edrush

    Best Book on Tribology?

    Looking for a good book on Tribology. Many advances are being made, so I want something published within the last couple of years. I am interested in sliding performance, not rolling performance, and lubrication. Looking for both theory and practical information. Any recomendations? How...
  4. edrush

    Low Creep Elasomer

    I am looking for an elastomer of approximately 70A hardness which exhibits very low creep. I am currently using a thermoset urethane. While testing is not complete, preliminary results do not look good. What type(s) of elastomers typically exhibit the best creep performance? The...
  5. edrush

    Endurance limit of Ti wire

    Can anyone give me an allowable fatigue stress for 3/8" diameter titanium spring wire? I need 4 million cycles of life, which I am assuming is near the endurance limit. I am trying to design a helical round wire spring which acts as both a torsional and compression spring. I am using the Von...
  6. edrush

    Grease degredation

    I am using a grease comprised of synthetic hyrodrcarbon oil, mineral oil, and a calcium soap in a sealed, reciprocating linear bearing application. The service environment is outdoors. It can be submerged occasionally, sometimes in saltwater. The bearing is greased on assembly and can not be...
  7. edrush

    Pitting of electroless nickel over 2024-T351

    Is electroless nickel plating on 2024-T351 prone to pitting? I have an assembly with multiple materials in contact (alum, nickel plated aluminum, SS, bronze, titanium, and sometimes carbon fiber). The whole system should be electrically isolated from ground (i.e. the ground) The nickel...
  8. edrush

    How to eliminate linear bearing noise?

    I have a reciprocating shaft running in two plain bearings (bushings). The shaft reacts a moment and the bearing pressures are significant (2000 psi). The shaft movement is about 5/16". I have a 16 uin surface finish (I think) but the thing sounds like a zipper during shaft movement...

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