A side face grinding machine with two vertically installed grinding spindles. These build in motor grinding spindles have variable r.p.m. and are mounted onto two cross slides. Each of them can move individually in vertical and horizontal direction. With help of the 600 mm diameter grinding wheels and the cross slide movements, the machine can be set to the geometry of the work pieces. This machine is mainly used to grind the small and the big end of connecting rods, no matter if these are for passenger cars or for truck engines. For example, the small end and big end of coplanar or non coplanar connecting rods of commercial and passenger vehicles can be machined on both sides and the trapezium as well.