1) This machine is characterized by automatic reciprocating movement of table which is electric motor; the grinding head is operated by one of the main motor which directly controls the grinding wheel spindle and by one additional motor for up-down movement of grinding head . 2) There are two ways of grinding for cylinder head/block, it is grinding wheel and insert milling cutter. 3) 700rpm high velocity milling and step-less speed regulation for feeding by frequency conversion control,high smooth surface of grinding/milling , suitable for aluminum alloy cylinder head/block. 4) 1400rpm high velocity grinding , precision feeder , suitable for cast-iron cylinder body. 5) The spindle box can move up and down for easy adjustment of spindle travel to grind/mill different height of cylinder head or block.