Working unit (1) for realizing holes (H) in a slab material (L) and for machining the inner side of the holes (H) thus formed, comprising a work table (2), at least one tool (4, 6) mounted on a motorized spindle, fixed means (8) for supporting the slab (L) and at least one support device (10) comprising a hollow element (11) intended to engage with a slab portion (P). The support device (10) comprises a top portion (12) movable at least between a raised position in which the slab portion (P) is coplanar with the slab (L) and a lowered position in which the slab portion (P) is lowered with respect to the slab (L) and therefore the hole (H) is free of the slab portion (P). The support device (10) comprises means (14) for locking the movable top portion (12) at least in the lowered position.

Working unit (1) for realizing holes (H) in a slab material (L) and for machining the inner side of the holes (H) thus formed, comprising a work table (2), at least one tool (4, 6) mounted on a motorized spindle, fixed means (8) for supporting the slab (L) and at least one support device (10) comprising a hollow element (11) intended to engage with a slab portion (P). The support device (10) comprises a top portion (12) movable at least between a raised position in which the slab portion (P) is coplanar with the slab (L) and a lowered position in which the slab portion (P) is lowered with respect to the slab (L) and therefore the hole (H) is free of the slab portion (P). The support device (10) comprises means (14) for locking the movable top portion (12) at least in the lowered position.

A processing procedure of an object in stone material and defining final profile, using: a work station of the object; tools to process the object and defining a removal thickness; a block for reciprocal movement between object and tool; a drive block control unit; an acquisition step wherein an acquisition system acquires the current cutting profile of each tool; an evaluation step wherein for each tool an offset is determined between object and tool as a function of the final profile, removal thickness and current cutting profile; and at least one processing step wherein the movement block reciprocally moves object and tool defining the offset.

A processing procedure of an object in stone material and defining final profile, using: a work station of the object; tools to process the object and defining a removal thickness; a block for reciprocal movement between object and tool; a drive block control unit; an acquisition step wherein an acquisition system acquires the current cutting profile of each tool; an evaluation step wherein for each tool an offset is determined between object and tool as a function of the final profile, removal thickness and current cutting profile; and at least one processing step wherein the movement block reciprocally moves object and tool defining the offset.

The invention relates to a method, a tool receptacle (13), and an apparatus for turning a face of a workpiece (2, 102) with a tool (3), wherein the workpiece (2, 102) is held in a workpiece receptacle (12) rotating about an axis of rotation (100) of a workpiece spindle, wherein, for producing and/or machining a workpiece contour having convex and/or concave portions on the face (20) that extend over defined angles of rotation, the tool (3) and the workpiece (2, 102) are moved back and forth relative to one another in an axial movement along the axis of rotation (100) of the workpiece spindle, said axis being synchronized with the rotational movement of the workpiece (2, 102), and wherein a blade (30) of the tool (3) is aligned at least in the cutting direction and/or transverse to the cutting direction opposite to the surface normals (N) of the workpiece contour to be produced and/or machined, in such a way that an effective clearance angle (α) and an effective cutting angle (γ) remain at least virtually constant opposite to the surface normals (N). The invention relates to a workpiece (2, 102) having a turned face.

The present invention relates to a chamfered silicon carbide substrate which is essentially monocrystalline, and to a corresponding method of chamfering a silicon carbide substrate. The silicon carbide substrate (100) comprises a main surface (102) and a circumferential end face surface (114) which is essentially perpendicular to the main surface (102), and a chamfered peripheral region (110), wherein a first bevel surface (106) of the chamfered peripheral region (110) includes a first bevel angle (a1) with said main surface (102), and wherein a second bevel surface (108) of the chamfered peripheral region (110) includes a second bevel angle (a2) with said end face surface (114), wherein, in more than 75% of the peripheral region, said first bevel angle (a1) has a value in a range between 20° and 50°, and said second bevel angle (a2) has a value in a range between 45° and 75°.

A method and apparatus is provided to rehabilitate and beautify cracked concrete surfaces by adding channels that look like the cracks to the surface.

A method and apparatus is provided to rehabilitate and beautify cracked concrete surfaces by adding channels that look like the cracks to the surface.

A device for taking a sample from a solid body by cutting out, having a frame and a cutting tool retained on the frame in such a way that the cutting tool can be moved relative to the frame, wherein the cutting tool, at least in parts, at least substantially has the shape of a hollow spherical cap or a hollow spherical segment. A method for taking a sample from a solid body by cutting out is implemented with the device.

A walk-behind apparatus and method for cutting non-linear trenches in concrete includes a frame supported by fixed direction wheels at a front end on a fixed axis of rotation, and multi-directional wheels at a rear end to rotate on movable axes of rotation, to permit the frame to rotate about a vertical axis passing through the frame. A handle is engageable by a user walking behind the frame for pushing the apparatus forward and/or for steering. A cutting wheel has a diameter of 5-20 inches and a cutting portion having a width of 0.5-1.5 inches. The cutting rotates on an axis parallel to the fixed axis and which extends notionally through the fixed direction wheels. The cutting wheel is disposed within a protective shroud viewable by the user to permit the user to visually align and guide the cutting wheel along a non-linear path on the ground while steering.