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Macropitting

Home » Topics » Materials » Macropitting
  • Image used on web version of announcement
    May 19, 2022
    By Phillip Olson

    Two New AGMA Publications

    AGMA is happy to announce the publication of two new documents: AGMA 925-B22, Effect of Tribology and Lubrication on Gear Surface Distress, written by a subcommittee of the AGMA Helical Gear Rating Committee, and, AGMA 943-A22, Tolerances for Spur and Helical Racks, written by the AGMA Gear Accuracy Committee.

  • September 1, 2018
    By Robert Errichello

    Lubrication: Viscosity and Macropitting

    A reader asks: Is the ISO VG 320 adequate, or should a higher viscosity grade be used? How can we stop macropitting in gear teeth?
  • January 1, 2011

    Point-Surface-Origin Macropitting Caused by Geometric Stress Concentration

    Point-surface-origin (PSO) macropitting occurs at sites of geometric stress concentration (GSC) such as discontinuities in the gear tooth profile caused by micropitting, cusps at the intersection of the involute profile and the trochoidal root fillet, and at edges of prior tooth damage, such as tip-to-root interference. When the profile modifications in the form of tip relief, root relief, or both, are inadequate to compensate for deflection of the gear mesh, tip-to-root interference occurs. The interference can occur at either end of the path of contact, but the damage is usually more severe near the start-of-active-profile (SAP) of the driving gear.
Read More
  • July 1, 2004

    Influence of Coatings and Surface Improvements on the Lifetime of Gears

Read More

Authors

  • Robert errichello
    Robert Errichello
  • Phillip olson
    Phillip Olson
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