Pdc bits having rolling cutters and using mixed chamfers

Abstract

A cutting tool cutting tool may include a tool body having a plurality of blades extending radially therefrom, a plurality of rotatable cutting elements having a first chamfer mounted on at least one of the plurality of blades, and a plurality of non-rotatable cutting elements having a second, distinct chamfer mounted on at least one the plurality of blades.

What is claimed is: 
     
         1 . A cutting tool comprising:
 a tool body having a plurality of blades extending radially therefrom;   a plurality of rotatable cutting elements, having a first chamfer mounted on at least one of the plurality of blades; and   a plurality of non-rotatable cutting elements, having a second, distinct chamfer mounted on at least one of the plurality of blades.   
     
     
         2 . The cutting tool of  claim 1 , wherein the first chamfer is smaller than the second chamfer. 
     
     
         3 . The cutting tool of  claim 2 , wherein the first chamfer is no more than 0.014 inches. 
     
     
         4 . The cutting tool of  claim 3 , wherein the first chamfer is no more than 0.012 inches. 
     
     
         5 . The cutting tool of  claim 1 , wherein the first chamfer is larger than the second chamfer. 
     
     
         6 . The cutting tool of  claim 1 , wherein the plurality of rotatable cutting elements are located in a shoulder region of the blade. 
     
     
         7 . The cutting tool of  claim 1 , where at least one rotatable cutting element is disposed in a nose region of the blade. 
     
     
         8 . The cutting tool of  claim 7 , wherein the at least one rotatable cutting element in the nose region has a third chamfer. 
     
     
         9 . The cutting tool of  claim 1 , wherein the plurality of non-rotatable cutting elements are located in a cone region of the blade. 
     
     
         10 . The cutting tool of  claim 1 , where at least one non-rotatable cutting element is disposed in a nose region of the blade. 
     
     
         11 . The cutting tool of  claim 10 , wherein the at least one non-rotatable cutting element in the nose region has a third chamfer. 
     
     
         12 . The cutting tool of  claim 1 , wherein the second chamfer is at least 0.014 inches. 
     
     
         13 . The cutting tool of  claim 12 , wherein the second chamfer is at least 0.016 inches. 
     
     
         14 . A cutting tool comprising:
 a tool body having a plurality of blades extending radially therefrom;   a plurality of rotatable cutting elements, wherein the plurality of rotatable cutting elements have at least two differing chamfer sizes based on their positioning along the plurality of blades.   
     
     
         15 . The cutting tool of  claim 14 , further comprising a plurality of non-rotatable cutting elements 
     
     
         16 . The cutting tool of  claim 15 , wherein the plurality of non-rotatable cutting element have a chamfer distinct from at least one rotatable cutting element. 
     
     
         17 . The cutting tool of  claim 14 , wherein at least one rotatable cutting element located in the cone has a larger chamfer than at least one rotatable cutting element located in the shoulder. 
     
     
         18 . The cutting tool of  claim 14 , wherein at least one rotatable cutting elements located in the cone has a smaller chamfer than at least one rotatable cutting element located in the shoulder. 
     
     
         19 . The cutting tool of  claim 17 , wherein the at least one rotatable cutting element in the nose region has a chamfer in between the chamfer size of the at least one rotatable cutting element located and in the cone and the at least one rotatable cutting element located in the nose.