COMPLEX WORKING SYSTEM

PURPOSE:To enable working of a work having a plurality of working points of different specification through single machine, by replacing a complex working tool having first and second tools movable relatively in axial direction to perform working independently as an unit. CONSTITUTION:A tool replacing system will catch the catching frange 31a of tool holder 31 of complex working tool 30 to mount the fitting section 31a in a tapered hole 15a of an adaptor 15 at the leading edge of spindle 11. Then the piston 57 in first cylinder system 55 of first working system 50 is retracted to function the first stopper means 40 by means of a resilient means 51 thus to secure the tool holder 31 to the adaptor 15 at the leading edge of spindle 11 while second stopper means 65 is functioned through driving of second working system to engage a tool shunk 33 to the leading edge of working member 60. Thereafter, shaft power means is retracted to retract the second tool 36 from the first tool 35 through the working member 60 to work the valve seat face by means of the first tool 35 through rotation/advance of spindle 11 then the second tool 36 is advanced to work a stem guide hole by means of second tool 36.