A formula for blank-diameters of thread rolling is developed here from the calculation of the volume of one thread. The theoretical diameter is affected by the surface roughness of blank and the axial elongation during thread rolling. Such effects are able to be diminished by the blank-finishing and thread rolling method.
The approximate distribution of the thread dimensions by rolling can be theoretically ditermined by the distribution of the blank-diameter, the thread rolling dies' form and the elastic deformation of the machine.
