Machine tool arrangement

A machine tool arrangement comprising a main motor including a hollow casing, a stator secured coaxially within said casing, and a rotor extending coaxially within said stator, said motor having a hollow cylindrical rotor shaft integral therewith and extending coaxially therethrough, a hollow driving spindle disposed coaxially within said rotor shaft, said spindle being inserted in said rotor shaft at one end thereof for relative axial movement and rotation, said spindle being driven in rotation by said motor, said spindle having an opposite end provided with an arbor-receiving opening, a drawrod extending through said rotor shaft and said spindle and having an externally threaded end, an arbor having an internally threaded opening engageable with said externally threaded end for securely attaching said arbor to said spindle, and adjusting means for adjusting the position of said arbor relative to a workpiece, said adjusting means including a hollow cylindrical quill housing secured at one end to said main motor casing, a hollow cylindrical quill received coaxially in said quill housing and supporting said spindle rotatably therein so as to slide axially relative to the spindle and the casing, and means for axially displacing said quill relative to said quill housing and said spindle.