Even great armatures eventually fail

摘要

Nothing lasts forever. After 2,500 hours, over 17 years, this shaker armature cracked and had to be replaced. It well served EDI, Engineering Dynamics of Englewood, Colorado, performing thousands of vibration tests. This magnesium alloy casting armature served on an Unholtz-Dickie Model R24 shaker, force rating Sine 8,000 lbs peak and Random 6,500 lbs RMS.