Patent ID: 7568867

Claim:
An air driven tool for use in a machining center, the air driven tool, comprising: an adjustable speed regulator; and a turbine driven by pressurized air directed thereto, said turbine being rotatable about an axis, a flow of the air being regulated by said adjustable speed regulator; a shaft aligned with said axis and having a hollow portion with air flowing therein, said shaft having at least one hole through a side wall of said shaft and connected to said hollow portion; said adjustable speed regulator including: a biasing member; an inclined annular surface being at an angle relative to said axis; a regulator plate; a plurality of movable bearings positioned between said inclined annular surface and said regulator plate, said biasing member biasing at least one of said inclined annular surface and said regulator plate toward each other; and a valve sleeve slidable along said shaft to selectively cover at least a portion of said at least one hole.