This tutorial concerns graduate students, either in DESS, DEA or engineer formations. The aim of these training is to allow them to apply their knowledge of microelectronics lectures and in the same time to surround difficulty of surface micromachining technology. In this work, students fabricate a polysilicon and an aluminium cantilever beam by using the usual technological process steps in cleanroom. The process is based on the stripping of an underlying sacrificial layer. At the end of the process fabrication a scanning electron microscopy observation is performed.