Abstract: A rotating cutter for a fixed cutter type bit includes an annular sleeve with a retainer having a plurality of inwardly extending tabs and a spindle cutter rotatably coupled to the annular sleeve. The spindle cutter includes a spindle extending into the annular sleeve and rotatable about a central axis of the annular sleeve, a base portion positioned between the retainer and a proximal end of the annular sleeve, and a cutter portion coupled to the spindle. The rotating cutter further includes at least one pin disposed between adjacent tabs of the plurality of tabs of the retainer to prevent axial movement of the base portion through the retainer.

Abstract: A method to drill a wellbore includes positioning a cutting structure proximal to a distal end of a drilling string, deploying a bottom hole assembly through a central bore of the distal end of the drilling string and the cutting structure, engaging the cutting structure with the bottom hole assembly, and rotating the cutting structure with the bottom hole assembly. An under reamer assembly includes a reamer shoe positioned proximal to a distal end of a drilling string and a cutting structure coupled to the reamer shoe, wherein the cutting structure is configured to be engaged by a bottom hole assembly, and wherein the cutting structure is configured to enlarge a pilot bore cut by a drill bit of the bottom hole assembly.

Abstract: Earth-boring tools comprise a face and a plurality of cutting elements disposed on at least a portion of the face. An impact material is positioned on at least one portion of a body and has a relative exposure equal to or greater than at least some of the cutting elements of the plurality of cutting elements. The impact material comprises a material having a lower abrasion resistance than the body. Methods of making and methods of using such earth-boring tools.

Abstract: Earth-boring tools comprise a face and a plurality of cutting elements disposed on at least a portion of the face. An impact material is positioned on at least one portion of the body and has a relative exposure equal to or greater than at least some of the cutting elements of the plurality of cutting elements. The impact material comprises a material having a lower abrasion resistance than the body. Methods of making and methods of using such earth-boring tools are also disclosed.