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  • Users: nickjk
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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. nickjk

    Help determining stainless material from lab results

    I am trying to determine the material of a detail I had tested at a local laboratory. Prior to testing I believed the material to be a hardened 440C stainless steel. Results from the lab stated that the core hardeness was Rockwell HRC 61 Chemical Analysis show the elements to be. C .98 Ni .09 S...
  9. nickjk

    Taper port question

    I know that it is common to use a taper external (male) thread with a parallel internal (female) thread for a hydraulic joint. Is it possible to use the reverse, a parallel external (male) thread with a taper internal (female) thread. More specific, would it be possible to create special taper...
  10. nickjk

    Static Load help with steel bals

    I am looking at a wedge application that places hardened spherical balls between wedge surfaces to allow a reduced wedge angle for greater mechanical advantage without locking problems caused by friction. Travel distance is very small, approx .090“. From research, I have found the maximum...
  11. nickjk

    Miniature JIS Rc Pipe Plug

    Miniature JIS Rc Pipe Plug I have a reference project that has a small 4.5mm measured Pipe Plug. The catalog calls out for a Rc Plug but does not state the size. I have searched all over but have not been able to find taper plugs that small. From my research the internal thread may or maynot be...
  12. nickjk

    Spring rate of a single split cylinder

    I have a 1" O.D. cylinder with a 3/4" I.D. that is 1 3/4" long. The cylinder has a slit on one side at full length. Uniform force will be applied to the O.D. of the cylinder to make the cylinder close in. I am trying to relate the uniform force to close-in the split cylinder to the change in...
  13. nickjk

    17-7 PH heat treat and project manufaturing process

    I am currently working on a prototype project making tubular blanks that will be machined then hydro-formed. The tubular blanks after hydro-form are designed to work like a radial spring. An FEA study showed maximum bending stresses in tension to be around 90,000 psi. The fist prototypes were...
  14. nickjk

    How to estimate strength increase from cold work

    Is there any way to estimate increase of tensile and yield strength due to cold work (hydro-form) and shot peening. I am currently making thin wall (.020") tubular blanks (1.037 O.D.) from 304/304L stainless in the annealed condition. The blanks are hydro-formed with a perimiter elongation of...
  15. nickjk

    Hydroforming Material Help Needed

    I am currently working on a project that involves hydro forming an aluminum tube and need help on the recommended grade of aluminum. The tube I.D. is approx 1" with a wall thickness of .020". The minimum hydro forming radius is .078". Calculated elongation during forming is approx. 4.8% Ratio...
  16. nickjk

    Aluminum Strain Hardening Exponent

    Could anyone please help me to find the strain hardening exponent for 7075 T6, 6061 T6 and 2014 T6 Aluminum. Thank you in Advance NickJK
  17. nickjk

    Deflection thin wall arch

    I am currently designing a project that uses a thin walled cylinder and was asked to come up with the following info. I started to solve the problem but feel I may be in left field because of the thickness of the cylinder. I have a thin wall cylinder (.874" I.D. & .020" wall). The I.D. of the...
  18. nickjk

    Help with check ball design

    I am having problems with a Spring seated check ball used in a low volume low flow (130 cubic in./min max) hydraulic device. The device uses a .250" steel ball, 4.4 lb spring with a 54 lb/in spring rate, 118 degree included angle seat with a .0147 sq. in. contact area. The original design...
  19. nickjk

    Round Cylinder as a spring

    If I have a round cylinder that I was to use as a holder for an object with clearance between the object and the cylinder I.D. If I apply a uniform pressure to the outside of the cylinder to contract or close the I.D. to hold the object. And I have calculated and confirmed during testing the...
  20. nickjk

    303 stainless work hardening

    I have a design that utilizes a cylinder made from 303 stainless. The I.D. of the cylinder has splines broached in it. The original designed was made from 440C stainless, but the change was made based on the increased machinability and better galling characteristics of 303. I am now wondering if...

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