Abstract: A positioning stud for master models, formed by a cylindrical body, in which approximately one third of its length is threaded, this threaded area being separated from the rest which is smooth, by a circular boss, to limit the threaded area being inserted in the master model concerned. The free end of the stud is adequately shaped to fit the auxiliary tool used to place it in the model.

Abstract: Improvements in template boring machines, formed because they leave the platform fixed and the bit with an up and down movement, by means of a circuit with various multivibrators connected to one another by different relay sections, allowing movement of the rotating motors and lift and fall of the bit; automatic cycle repeat, by means of end of stroke microswitches designed in the lift and fall motor; acoustic means coupled to warn of end of cycle, and time constant device, for automatic cycle performance, and adjustment of bit, by immobilizing the rotating motor of the bit, and lift movement of the bit to a maximum position, where it is set, returning to automatic performance when a hand switch is pressed.