Abstract: The invention relates to single-lip drills in which two longitudinal grooves are formed in the rake face. They are arranged in the longitudinal direction of the tool, spaced apart from one another by a ridge and favor chip breaking.

Abstract: A variable focus system that includes an electrovariable optic (EVO) and a controller operatively configured for changing the focal configuration of the EVO. The EVO includes a plurality of movable optical elements that may be moved substantially in unison with one another so as to change either the focal length of the EVO, the direction of the focal axis of the EVO, or both, depending upon the needs of a particular application. The variable focus system may be used in conjunction with an image source to construct a 3D floating image projector that projects a series of 2D image slices of a 3D image onto corresponding respective image planes in succession rapidly enough that a 3D floating image is perceived by a viewer.

Abstract: A variable focus system (100) that includes an electrovariable optic (EVO) (108) and a controller (112) operatively configured for changing the focal configuration of the EVO. The EVO includes a plurality of movable optical elements (164) that may be moved substantially in unison with one another so as to change either the focal length (f) of the EVO, the direction of the focal axis (132) of the EVO, or both, depending upon the needs of a particular application. The variable focus system may be used in conjunction with an image source (116) to construct a 3D floating image projector (500, 540, 560, 600) that projects a series of 2D image slices (IS1-IS7) of a 3D image onto corresponding respective image planes (IP1-IP7) in succession rapidly enough that a 3D floating image (120) is perceived by a viewer (104).