... .Type A CNC slider and drilling unit head, can control depth of holes, with function of drilling blind hole, reaming, chamfer ... four sets of work pieces, and downloading work pieces when drilling simultaneously. 4.CNC, PLC systems, CRT display. 5.Programming ... thinner steel boardNumber of tank for champing12Max. diameter of drillingφ50mmRange of spindle rotation speed(r/min)130560,Transducer stepless ...