Soft-Foot is a condition in which one of the foundation bolts of a machine is not on the same horizontal plane of the remaining three foundation bolts. This results in heavy vibration of the machinery and subsequent cracking of the foundation. The machine may finally collapse if un-attended. In such cases the machine’s vibration level can be decreased dramatically by loosening one or more hold down bolts. Motors and generators are more susceptible to soft foot. First we need to find out which one of the foundation bolt in the Soft-Foot.
This experiment shows how to find out the actual soft foot of rotating machinery by experimental method