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  1. BrainFailure

    7075 vs 7068 Fatigue Data

    I have always wondered if 7068 would perform better at high cycle fatigue, but until recently I could not find any information. Here is what I found: http://www.kaiseraluminum.com/wp-content/themes/kac/files/alloy-7068-rod-and-bar.pdf The only problem is that this test had a static stress...
  2. BrainFailure

    Profile Bearing Length Ratio, tp, ASME B46.1

    Howdy: An engineer that no longer works at my company put a spec for Profile Bearing Length Ratio on a print at my company that I am not clear on. Is this a bad spec or do I just lack the education to interpret it? Here is the spec: tp = 50% TO 70% AT DEPTH P = .25 Rtm, RELATIVE TO REFERANCE...
  3. BrainFailure

    Switch Contact Design Help

    Howdy: Not sure if this is the right forum. I am working on a product with a motor that has an encoder and a gearhead. The encoder is an incremental type so I need some kind of sensor to signal every time the output shaft reaches a specific angle. Unfortunatly this sensor must fit around a...
  4. BrainFailure

    Nitrile Seal Problem

    Howdy: My company builds hydraulic dampers for prosthetic knees. I am having a problem with nitrile seals (60A durometer) that are shrinking about 3% over a period of about 2-4 months. When we build the dampers we 100% inspect them. We are having units that pass when they are built, but...

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