... tubes,copper,stainless steel,aluminum,steel, etc. This machine is NC control, for punching & drawing tapered holes on round tubes,copper ... bores, one time forming, no burrs and chips.It is NC control, touch screen operation, error displaying, simple and convenient operation ... ) Min. hole distance: 15mm 5) Max. workpiece length: 1500mm 6) Working speed: 4 seconds per hole 7) Hole position tolerance: less ...