Patent ID: 7810568

Claim:
A method of making a window in a tubular, comprising: creating a window through an existing downhole tubular; running in and rotating an articulated mill on a string having a body having a longitudinal axis and supporting a cutter assembly comprising cutting components, all of said cutting components extending an initial distance with respect to said body in the direction of said longitudinal axis and all of which articulate in tandem while maintaining their relative positions with respect to said longitudinal axis by moving substantially parallel to a stationary ramp on said body which results in radial extension of said cutting components away from said body from an initial dimension through the tubular and increasing the dimension of the mill by articulating said cutting components at a location at least in part within the tubular by axially moving one part of said mill with respect to another part of said body to change the support for said components from one part of said body to another; and initiating said window with a window mill ahead of said articulated mill.