command: bore x,y,z,z2 d1,d2 r1,r2 [a1,a2]
purpose: to bore a hole or round an edge
description: Starting at x,y,z,z2, an inner and outer radius is defined. If angle a1 and a2 are not defined, a hole is bored to depth d1 and d2, otherwise, a portion of hole is bored from r1 to r2, from angle a1 to a2

Video of bore
Video #2 of bore
Video #3 of bore
See also: xystep dinc rstep