the flow of a flow stream down the inner bore 178 the sub 170 will be situated within a work string as previously discussed thus as the rotor 172 is rotated the external guide profile 174 will cooperate with an inner guide profile 180 located on the inner body of the sub 170 in accordance with the teachings of the present invention as the rotor 172 turns the cooperation of the external profile 174 and the internal profile 176 will cause a raising of the rotor 172 and in turn a lowering of rotor 172 which results in a striking of the hammer rotor 172 against the anvil 176 it should be noted that the external guide profile and internal guide profiles herein described will be similar to the jagged saw tooth guide profile previously discussed in that the profiles provide a guide for cooperative engagement of the rotor to rotate as well as to raise and lower the profiles for fig7 a through 13 have a helical type of profile the helical profile may take the form of a thread profile due to the curved nature of the profile about a cylindrical surface fig7 b depicts a laid out the helical profile in fig8 a schematic illustration of another percussion sub 182 embodiment having a rotor 184 with internal guide profile.