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Recent content by howard1954

  1. howard1954

    KHK standards for preessure vessels

    I have a customer that wants our auxillary pressure vessel to meet KHK standards. we have designed to ASME Sect VIII div1. MAWP is 765 at 40C (operating temp). We were using forged 6 inch ANSI B16.5 Class 400 steel lap joint flanges, but I understand that KHK requires 43mm thick flange vs 41mm...
  2. howard1954

    How do I accurately measure moment of inertia of a small motor rotor

    When using bi-filar or tri-filar methods one must be sure the strings are taut and don't stretch during the timing. Make sure there are no kinks in the strings.
  3. howard1954

    Cobra Solid Lubricant for bearings by UTA

    I have been using this for about 6 months with standard roller bearings that are get washed thru with a solvent during a process. This of course removed the grease and caused the bearings to sieze. I have not had any problems since changing to Cobra.
  4. howard1954

    Mag-Drive/Seal less vs. Canned Motor Pumps

    Interesting problem. In a magnetic drive with a metallic barrier, heat is generated due to the induced electric fields produced in it. Ways to reduce this heating are decreasing the magnetic flux or increasing the resistivity of the barrier. If the magnetic flux has increased (increased rating...
  5. howard1954

    keyway and key design

    2000 lb-ft on a 1-1/4 diameter inch keyed shaft is not feasible. If you are restricted to a 2-1/4 hub diameter, you should consider using a splined connection (sort of like many keyways). For reference, the standard SAE F spline 8/16 DP 15Tooth and 1 inch length, it has a major diameter of 2...
  6. howard1954

    Magnetic coupling

    We have a number of small magnetic couplings that can be used in your situation. There are two styles: disc and co-axial. The disc style is like 2 pancakes with magnets on the faces and hubs to connect to your shafts. The co-axial is an inner ring of magnets surrounded by an outer ring of...
  7. howard1954

    Question about a Hysteresis Brake

    There seems to be some confusion here about types of magnetic couplings, clutches, and brakes. There are three different types of magnetic interactions that can be used. 1. Synchronous- The pole pieces attract one another and torque is transmitted in synch with one another. There is no relative...
  8. howard1954

    Why aluminum plate in eddy current device?

    Actually, the effect can be seen at nearly any speed. With a 1/4" air gap, you can barely move a 1/8" thick aluminum plate thru the field by hand.
  9. howard1954

    Why aluminum plate in eddy current device?

    Eddy current devices create drag (torque), whenever a conductive material is moved within a magnetic field. The more conductive the material, ie, Silver, Copper, Aluminum, the higher the induced eddy currents. The stronger the magnetic field, the higher the higher the induced eddy...
  10. howard1954

    Linear Magnetic Resistance

    Looked at the mag-rheo fluids vs hysteresis. Hysteresis requires no outside power source and continuous duty is no problem up to max power dissapation.
  11. howard1954

    Linear Magnetic Resistance

    Sounds like a hysteresis brake/clutch is what you need. These devices work at any speed above zero. Linear is also no problem. A set of High Coercivity alternating pole permanent magnets (rare earth) on one moving part is positioned near a set of magnets with low coercivity (AlNiCo). As the...
  12. howard1954

    Help. How and where to make magnetic fluid

    You can buy small quantities from American Science and surplus or Edmunds
  13. howard1954

    Where can I find information concerning the magnetic properties of various materials?

    Try the ASM Ready Reference: Electrical and Magnetic Properties of Metals. (ISBN 0-87170-690-3)
  14. howard1954

    Data on Initial Permeability

    Relative permeability tables are in ASM Ready Reference: Electrical and Magnetic Properties of Metals (ISBN 0-87170-690-3)
  15. howard1954

    Magnetic Coupling for a Pump

    Magnetic drive couplings are non-contact. There is nothing to fail or wear out. Most of the time the magnetic rotor that is immersed, is manufactured from 300 series stainless. The pump rotor must be fully supported, ie, bearings in your fluid. The barrier between the coupling halves must be...
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