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  1. nickjk

    Hydrodynamic Journal Bearing on Stamping Press Machine

    I have been doing some research on Hydrodynamic lubrication for bearings. Using Raimond and Boyd Charts I studied the numbers while increasing viscosity like stated in romke post above. At a ISO VG 150 using calculated loads and velocities I was finding minimum film thickness ranging between...
  2. nickjk

    Hydrodynamic Journal Bearing for Stamping Press

    Made a mistake in my last post 180 SPM is 3 rev per second Sorry for confusion NickJK
  3. nickjk

    Hydrodynamic Journal Bearing on Stamping Press Machine

    Hi romke, I will look at how using a different viscosity will effect the calculations. The answer to your statement "whether hydrodynamic lubrication can be more or less achieved will depend on load, speed and oil viscosity" is what I am looking for. How do I know based on load, speed and oil...
  4. nickjk

    Hydrodynamic Journal Bearing for Stamping Press

    The Mechanical Press speed is currently 100SPM. I am looking to see what I can do to increase it to 180SPM. That is where the 1 rev per 3 seconds is coming from. Used to blank and draw small parts
  5. nickjk

    Hydrodynamic Journal Bearing for Stamping Press

    Hi All, I am currently trying to determine if the main and connection journal bearings used on a stamping press could be designed to use hydrodynamic lubrication. The press is rated at 150tons so for approximation I am using 75 tons of load force at each of the 2 main bearings. The bearing I...
  6. nickjk

    Hydrodynamic Journal Bearing on Stamping Press Machine

    Hi All, I am currently trying to determine if the main and connection journal bearings used on a stamping press could be designed to use hydrodynamic lubrication. The press is rated at 150tons so for approximation I am using 75 tons of load force at each of the 2 main bearings. The bearing I am...
  7. nickjk

    440C Stainless & Massive Chromium Carbide Particles

    Metengr Specifically what type of failure analysis are you suggesting be performed on the test piece? Exactly what would you test or look for? The sample piece is not large enough to check for strength values and at this point I do not have a sample prior to heat treat. Nickjk
  8. nickjk

    440C Stainless & Massive Chromium Carbide Particles

    tbuelna I am using formulas for stress and strain due to pressure on or between elastic bodies Table 14.1 Roark's 7th edition Condition Sphere on a flat plate. The bending stress is because the race is slit. When load is applied the race closes in removing clearance, when load is removed the...
  9. nickjk

    440C Stainless & Massive Chromium Carbide Particles

    I would like to thank everyone for replying I will contact the lab to see if they can measure the prior-austenitic grain size of both samples (Snyder-Graff grain size). When I was at the customers facility I had them measure hardness of the sleeve that failed, it was 58 RC. I do not have the...
  10. nickjk

    440C Stainless & Massive Chromium Carbide Particles

    Maui, The report from the tech states "the average equiaxed prior austenitic grain size was estimated to be 10.0 in the section examined as rated to ASTM E112-13 Plate 1A and Plate 1B see fig.3 & fig.4". For what ever it is worth the Material Mill Cert states the grain size as 8.5. My customer...
  11. nickjk

    440C Stainless & Massive Chromium Carbide Particles

    Hello all, I currently have a project consisting of a sleeve being used like a inner bearing race. The material of the sleeve is 440C stainless and is vacuum furnace heat treated AMS 2759/5 gas quench (Rock "C" 58-61) Recently I had several failures where the sleeve material yielded and the...
  12. nickjk

    Dynamic O-ring failure Short Stroke

    Btrueblood, Operating pressure 1015psi max 362psi min. one direction Single acting application 0 psi opposite direction. 8.81%-14.6% squeeze is in the range of what is recommended for a dynamic reciprocating o-ring. (Parker spec's 9%-16% Treleborg spec's 6%-20%) The diametral clearance is...
  13. nickjk

    Dynamic O-ring failure Short Stroke

    I am working on a project that is experiencing o-ring seal failure during life testing. Any suggestions or thoughts to improve seal life would greatly be appreciated. The seal design applied has been used in other very similar product with great success (smaller in bore size) Note: all...
  14. nickjk

    440C heat treat distortion

    I am making tubular sleeves from 440c stainless. The sleeves call for a Vacuum Furnace Heat Treat AMS 2759/5 Gas Quench (Hardness Rock “C” 59-61) I have made four batches of these sleeves and up till now distortion after heat treat has been very constant. The first four batches the part shrunk...
  15. nickjk

    Collet Manufacturing Question

    mfgenggear, Thanks for the reply In your experience, after grind, is the slot hard to deburr at the bore? The heat treat source did not feel the part would distort greatly. He feels the greater the change in cross section, the more distortion there would be, because the part is uniform...
  16. nickjk

    Collet Manufacturing Question

    mfgenggear The turn source believes the slot should be done with an abrasive wheel after grind is complete. Just met with the grind source and they would like to receive the part with a partial slot, webs at the end to cut away after finish grind. He said because of the wall thickness, cutting...
  17. nickjk

    Collet Manufacturing Question

    Collet Manufacture Question I have a single slot collet design that I need to release for build but have questions related to the manufacturing procedure. The collet will be made from 440C stainless and heat treated to 59-61 Rock “C”. After heat treat the collet taper and I.D. will be ground...
  18. nickjk

    440C distortion

    I am designing a tubular shape detail out of 440c stainless that will be vacuum furnace heat treated to AMS 2759/5 spec’s using gas quench (Rock “C” 59-61). I am trying to determine an approximate value the O.D. and I.D. may distort and grow so I can determine which diameters will require a...
  19. nickjk

    Help determining stainless material from lab results

    Ed, Sorry, I thought it was not a tool steel only because the Cr values of the tool steels I looked up were around 5.5%, maybe I missed something. I also know from the Cr value it is not a stainless material. Do you have a tool steel in mind with similar percentages, I could not find one...
  20. nickjk

    Help determining stainless material from lab results

    I asked the lab if they have ever seen a material similar in make up. The response was not here in the states but yes in items tested from Japan. After looking at hot worked tool steel tables I do not believe it to be a tool steel, but thanks for the thought. My application is similar to a...

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