... the function of drilling,boring,pull boring,trepaning,burnishing. Machine brief 1) Drill hole method: Single spindle internal chips removal (BTA method ... is driven by servo main motor ,Main motor power 30kw, high speed shift max.800rpm. 6) Tooling infeeding adopts servo motor ... driven by servo main motor,main motor power is 30kw,high pseed shift Max rotation is 800r/min,in front of ...