Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    dinjin, the 1.1 profile shift is correct and it does have pointed teeth:
  2. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    I really appreciate all the advice from everyone. Sorry for the delayed response. To answer some questions: Speed and load: During normal operation, the max loading for the gear occurs at stall (0 RPM) where bending stress can reach ~250MPa according to Lewis formula. The gear can go as fast...
  3. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    Thanks to everyone for the responses so far. We are still leaning toward changing the material to a low-alloy steel (SCM415) and carburizing or carbonitriding the teeth. Will this help at all? I've included a few more photos of a second sample of the same gear that also failed the same...
  4. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    Desertfox, the gear teeth are very small (0.35 module). Even the smallest shot size I can find (S-70, .007") would be much too large, right?
  5. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    Israelkk, the assembly is mounted on a vehicle so our vibration tests are based on ISO 16750-3: Road vehicles—Environmental conditions and electrical testing for electrical and electronic equipment, Mechanical Loads. Dinjin, the mating pinion has 9 teeth and is profiled shifted by 1.1. There...
  6. thetank8

    Through vs Case Hardening to Fix Root Fatigue Failure

    A spur gear exhibited a broken tooth during a vibration test. The vibration of the overall assembly translated to an unknown input torque on the shaft of this gear which resulted in it impacting its mating gear in both directions. The rotation of the mating gear is ultimately constrained by a...

Part and Inventory Search