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  • Users: sokenyou
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  1. sokenyou

    Shaft failed due to reversed torsional fatigue?

    Hi Everyone, I got this failed shaft from work (please see the attached). It's the main drive shaft for our Bath Tissue Converting machine - we called it the knock off paddle. Based on what I saw and what I read from the book "How Components Fail", it looks like a Reversed torsional fatigue...
  2. sokenyou

    Helical gear failure, is it misaligment or overload?

    Hi Everyone, I have this failed gearbox, which is pretty small, driven by a 1.5 HP motor at 1760 rpm. It drives a what is called Zero pressure conveyor. It failed and caused some downtime. My Manager said it's not just an age thing, it's an overload but only a section of the gearteeth wore out...
  3. sokenyou

    Roller shaft failed

    In a paper converting mill, one of our draw roller shaft failed at the weakest point (near the bearing and chamfer with the radius of 0.5). Rachet marks (but shiny) indicates that fatigue cracks were initated at a few locations along the groove. The eccentric pattern tells me that the load on...

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