System and method for adjusting roller cone profile on hybrid bit

摘要

An earth boring drill bit designed for a specific performance, within a finished product tolerance, using components built to a looser manufacturing tolerance. The bit may be assembled by selecting a leg from a plurality of pre-manufactured legs; selecting a bit body from a plurality of pre-manufactured bit bodies, the bit body having a slot for receiving the leg; placing the leg within the slot; and fixing the leg within the slot within the finished product tolerance by placing one or more shims between the leg and the slot. The shims may be used to adjust an axial position, a radial position, and/or a circumferential position of the leg with respect to the slot. The leg and the bit body may be selected, or produced, to ensure the bit will not meet the specification, given the manufacturing tolerance, without the shims.

主权项

1. A method of assembling an earth boring drill bit to meet a finished product tolerance relative to a desired aggressiveness of the finished drill bit using components built to a manufacturing tolerance, the method comprising the steps of:
selecting a bit body from a plurality of pre-manufactured bit bodies, the bit body having one or more axially extending slots; selecting one or more legs from a plurality of pre-manufactured legs, the one or more legs including a region that is shaped to correspond with the shape of the one or more slots; placing the one or more legs within the one or more slots; and fixing the one or more legs within the one or more slots to meet the desired aggressiveness within the finished product tolerance by placing one or more shims between the one or more legs and at least one of the walls of the one or more slots wherein the one or more shims adjust an axial location of the one or more leg in an axial direction parallel to a longitudinal axis of the bit body.