Patent ID: 6565297
Filing Date: 2003-05-20
Classification: B23G,Y10T

Abstract:
A method of milling a large thread length, comprising the steps of:providing a thread milling cutter having a shank to be received in a spindle of a machine tool, and a milling section adjoining the shank at a front end of the shank, having a length corresponding to a length of the to-be-milled thread and including a plurality of rows of teeth, which extend parallel to each other and are separated by locking grooves, with the teeth of each of the plurality of rows being arranged one after another in an axial direction of the cutter, with at least two adjacent teeth in each row being separated by at least one missing tooth space, and with corresponding teeth of all of the plurality of rows lying on an circle a plane of which extends perpendicular to a longitudinal axis of the cutter; positioning the thread milling cutter in a bore of a workpiece in which the thread is to be milled, with the cutter being adjusted in an axial direction and fed outwardly; forming a portion of the thread by imparting to the cutter a rotational movement, an axial feeding movement, and a circular movements; and forming a further portion of the thread by imparting to the cutter, without repositioning the cutter, a further circular movement, with a number of turns of the further circular movement corresponding to a number of missing teeth in space between two adjacent cutting teeth, while the cutter is being imparted with rotational and axial feeding movements, whereby a complete thread is formed at an end of a milling process.