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Recent content by Johnson_123

  1. Johnson_123

    Designing Knurled Interference Fit

    @Kyle Loctite is already in use.
  2. Johnson_123

    Designing Knurled Interference Fit

    @stick Tapered- lock bushing will significantly increase the cost. Perhaps not feasible as a result. Shaft diameter is 0.163 in. Bore diameter is 0.156 in.
  3. Johnson_123

    Designing Knurled Interference Fit

    @BUGGAR and @chez311 It is a straight knurl. Diametrical Pitch 96.
  4. Johnson_123

    Designing Knurled Interference Fit

    I have a knurled interference fit between a shaft and a gear. With an interference of 0.007 in, I am achieving an experimental slip away torque of 7 ft-lb and bending the shaft in the process. What could I possibly do to achieve a higher torque without bending the shaft during the assembly? Both...
  5. Johnson_123

    Pipeline Pulsation Reduction

    Could someone please recommend modifications/reinforcements that could be made to a pipeline to reduce its vibration? Installing a pulsation dampener is not an option that the customer is willing to pursue. Currently, the vane pump sits on a solid base as recommended by the manufacturer and flex...
  6. Johnson_123

    Determination of ID and OD at Cryogenic Temperatures

    EdStainless Based on your statement, will the below expressions suffice? Thank you. OD (Temp) = OD (293) + alpha (Temp) ID (Temp) = ID (293) - alpha (Temp)
  7. Johnson_123

    Determination of ID and OD at Cryogenic Temperatures

    rb1957 If the cross-section were to contract with the expansion in length, would the Poisson's ratio figure in the expression?
  8. Johnson_123

    Determination of ID and OD at Cryogenic Temperatures

    EdStainless and rb1957 I perhaps should have asked, if the percent change in the length of the tube for a given temperature difference is the same as the percent change in its diameters individually?
  9. Johnson_123

    Determination of ID and OD at Cryogenic Temperatures

    I have a 316 SS tube with an I.D. of 0.43″ and O.D. of 0.5 ″. Could someone please advise me on how I would calculate the I.D. and O.D. of the tube at cryogenic temperatures? The linear thermal expansion percent (L – L293/L293) at a temperature range (0 K – 300 K) is the only material property...
  10. Johnson_123

    Stiffness Calculation

    No, the frequency is not being used as a measure of stiffness. When heated or cooled, the boundary conditions will resist the change and generate stress in the tube. I am using the equation listed in the Cryogenics NIST website to define Youngs Modulus as a function of temperature.
  11. Johnson_123

    Stiffness Calculation

    I have a simple omega-shaped SS tube, vibrating at it's natural frequency and constrained at both the ends. Could someone please tell me how I would calculate it's stiffness as a function of temperature. The temperature range I am looking at is 5K to 300K. Thanks in advance!
  12. Johnson_123

    Youngs Modulus - 316L SS

    Could someone please suggest a reliable resource containing information on Youngs Modulus for 316 Stainless Steel at Cryogenic temperatures? Thanks in advance!
  13. Johnson_123

    Polymer selection

    Could someone please recommend a polymer to be over-molded onto a metal surface to create a soft seat valve? This valve will be used in LPG applications. We are currently using Buna-N and it appears that the liquid has gotten between the metal and the rubber and caused the rubber to balloon...
  14. Johnson_123

    260 Cartridge Brass - Hard vs Half Hard

    My supplier is out of 260 Cartridge Brass - Hard Temper which is being used to manufacture flat washers. Can somebody advise me, if the half hard temper which is readily available be used as a replacement? Thanks in advance!
  15. Johnson_123

    Galvanic Corrosion - Leaded Brass and Aluminium

    Additional information: The deposit was sent to analysis and the EDS spectrum indicated the presence of Oxygen, Copper, Zinc, Lead and Tin.

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