Patent ID: 8282319

Claim:
A rotary material removal tool, comprising: a shaft having a first axis; and a body including a top side, a bottom side and a plurality of radially extending arms, the top side mounted to a first end of the shaft for rotational motion of the body about the first axis, wherein each arm includes a radially outward peripheral edge, and, relative to a direction of rotational motion of the body, a leading side and a trailing side, wherein the radially outward peripheral edge includes a cutting insert mounting structure that projects axially below the bottom side of the body, and wherein at least one of (i) a leading edge of the insert mounting structure includes an air-displacement structure, (ii) the radially extending arms include at least one through-opening extending from the leading side to the trailing side, and (iii) the bottom side of the body is spaced from a plane containing a bottommost surface of the projecting cutting insert mounting structure.