This is a dataset that was used for the IEEE PHM 2012 Data Challenge. It used to be online at http://www.femto-st.fr/en/Research-departments/AS2M/Research-groups/PHM/IEEE-PHM-2012-Data-challenge.php, but isn't anymore.
The set contains a training set of 6 rolling bearings that were operated in three different conditions, and a testing set of 11 more. See the added PDF file for all the info of the challenge and the set.
The dataset was up for anyone to download for almost six years, which leads me to believe it should still be available. Cite this dataset whenever you use it with below citation though!
Patrick Nectoux, Rafael Gouriveau, Kamal Medjaher, Emmanuel Ramasso, Brigitte Morello, Nourredine Zerhouni, Christophe Varnier. PRONOSTIA: An Experimental Platform for Bearings Accelarated Life Test. IEEE International Conference on Prognostics and Health Management, Denver, CO, USA, 2012.