I know that Centauro and ACM are located near each other but did not think they were related in any way. ACM made or makes at least two series. Felder sold the heavier in the 540,640,740 series. Centauro builds heavy saws labeled 500,600,700 etc. There can be some modifications for each private label but I have not heard there is any downward build other than the lighter ACM 400,500,600 series. Dave