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Recent content by mjhward

  1. mjhward

    Preset Spring

    I have a compression spring (.42OD, .047wd) in a static situation with no enviromental conditions. I am using Music Wire. In it's static condition, I estimate that I am at 56% of tensile strength. Spring mfgs. are telling me that if I am above 45%, I will get permanent set. I know if I...
  2. mjhward

    Machining 17-4PH

    I have a piece of 0.25" 17-4 plate that forms a Z shape (approx. 7" long and 2" high with web of 3/16" thick). I had the plate treated to approx H900. I waterjet cut the Z shape. I then had to mill 0.06" off most of one side. The part warped 0.05". I had the...
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