This machine is mainly applied to bore and grind bearing holes (including copper quill and connecting-rod tile) on connecting-rod of gasoline and diesel engines in automobiles, tractors and other power sources. Customer also can carry out fine boring or grinding process to connecting-rod bearing seat of deformed workpiece, after grinding combining surface, to ensure the parallels of tow center lines. Equipped with various specialized fixture, TM8216 can be used to complete fine boring and grinding process to piston pin holes, gas pump bearing holes and valve seat holes.