rate of penetration of the bit into a formation being drilled or of a mill into an item being milled or of a wellbore being reamed in conclusion therefore it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth certain changes can be made in the subject matter without departing from the spirit and the scope of this invention it is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to the step literally and or to all equivalent elements or steps the following claims are intended to cover the invention as broadly as legally possible in whatever form it may be utilized the invention claimed herein is new and novel in accordance with 35 u s c u00a7 102 and satisfies the conditions for patentability in u00a7 102 the invention claimed herein is not obvious in accordance with 35 u s c u00a7 103 and satisfies the conditions for patentability in u00a7 103 this specification and the claims that follow are in accordance with the requirements of 35 u s c u00a7 112 the inventors may rely on the doctrine of equivalents to determine and assess the scope of their invention and of the claims that follow as they may pertain to apparatus and or methods not materially departing from but outside of the literal scope of the invention as set forth in the following claims all patents and applications identified herein are incorporated fully herein for all purposes.