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Recent content by SAP

  1. SAP

    Helical Gear Planetaries

    Guys, I think your last conclusion about the direction of forces may not be correct. A simple free body diagram may help. The sun (due to the helix angle) imparts an equal axial force on each of the three planets, all in the same axial direction. These three planets impart this same force onto...
  2. SAP

    "See saw" balance/instability

    Here's something else to consider, albeit totally impractical and highly unlikely to be a consideration in the real world....The gravitational force acting on the see-saw is a function of the square of the distance from the centre of the earth to the centre of the mass of the see-saw. Therefore...
  3. SAP

    Helical Gearbox Service Factor

    TibbsB There are several factors which go into the calculation of the rating of a gearbox. These things typically include bearing life, overhung loads, shaft torque capacity, gear tooth rating, housing strength, thermal loads, etc. Usually the gearbox manufacturer will specify the required...
  4. SAP

    What is AGMA allowable stress?

    Jackboot, The AGMA allowable stress are determined by laboratory tests and accumulated field experience. It is not just the yield and tensile strength that determines the allowable stress, but other factors such as cleanliness, heat treatment, level o finspection etc. If you know the tensile...
  5. SAP

    Shear stress from Ultimate or Yield?

    As a reference for Key design, I suggest you have a look at AGMA 6001-D97. This lists the allowable compressive stress as Sca = 0.7 x Sy (ie 70% of yield). The allowable shear stress is then given as Ssa = 0.5 x Sca (ie 50% of allowable compressive stress). SAP
  6. SAP

    ISO Tolerances

    The ISO standard number is 286. This ISO standard has also been adopted by Australian standards as AS1654.1 and AS1654.2 which can be purchased online at www.standards.com.au
  7. SAP

    Coupling friction vs fitted drive bolts

    No, it is not necessary to add fitted bolts to a rigid coupling when all of the torque can be taken by the friction in the joint. The fitted bolts just add to the cost of both the bolts, and the manufacture of the rigid coupling. make sure that the friction in the joint is adequate, and that the...
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