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  • Users: Airfix
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  1. Airfix

    Press Fit Stresses - Three Ring?

    I'm working a problem with a three ring press fit situation and I'm trying to find the stresses in the middle ring. Can anybody point me to a method for calculating this by hand/excel? Analysis of the stresses as a reult of the press fit between two cylinders is fairly well established in...
  2. Airfix

    Pitch Diameter as Primary Datum?

    I see lots of callouts where thread pitch diameter and gear pitch diameter are the primary datums. I had an instance recently where an outlet hole in an oil jet had to be controlled back to a thread pitch diameter as its primary datum. As a pitch diameter is a theortical diameter I'm having a...
  3. Airfix

    Oil Flow Measurement - Small Diameter - Very Cold?

    Our company has run many oil component tests at room temperatures and above using impeller style flow meters. However these meters become inaccurate and difficult to calibrate at cold temperatures. What is the best flow measurement method for measuring MIL-PRF-7808 oil in a swagelok type bench...
  4. Airfix

    Polymer Youngs Modulus much different in Compression?

    I am designing a test fixture that needs to be of a certain overall axial stiffness to test a linear actuator. The test stand sees a linear load from the actuator that puts a compressive load and bending load into the test fixture. To get the test stand to the correct stiffness I made a very...

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