Described herein is a first method of forming a hole in a workpiece, having a first surface and a second surface opposite the first surface. The method includes forming a first hole, having a first diameter, in the workpiece by passing a first cutter through the workpiece from the first surface to the second surface. Additionally, the method includes forming a chamfer in the second surface of the workpiece concentric with the first hole using a second cutter. The chamfer has a second diameter larger than the first diameter. The method further includes forming a second hole, having a third diameter larger than the first diameter, in the workpiece concentric with the first hole by passing a third cutter through the workpiece from the first surface to the second surface.

A key-cutting machine includes: a support structure; a front operational area which is accessible by an operator; at least one milling and/or cutting unit which is positioned in the front operational area and which includes at least one end mill, and/or another cutting member, to carry out a bitting processing of a key. The key-cutting machine also includes at least one clamp, which is positioned in the front operational area, to hold the key to be machined, so that a face of the key to be engraved is arranged substantially horizontally. The key-cutting machine also includes a device for engraving at least one face of the head of said key, said device being positioned inside the front operational area of said duplicating machine; and at least one pair of engraving tools mounted on a support unit. Each engraving tool includes cutting sections for engraving a corresponding face of a key.

A key-cutting machine includes: a support structure; a front operational area which is accessible by an operator; at least one milling and/or cutting unit which is positioned in the front operational area and which includes at least one end mill, and/or another cutting member, to carry out a bitting processing of a key. The key-cutting machine also includes at least one clamp, which is positioned in the front operational area, to hold the key to be machined, so that a face of the key to be engraved is arranged substantially horizontally. The key-cutting machine also includes a device for engraving at least one face of the head of said key, said device being positioned inside the front operational area of said duplicating machine; and at least one pair of engraving tools mounted on a support unit. Each engraving tool includes cutting sections for engraving a corresponding face of a key.

A levelling machine includes a pair of spaced apart rail assemblies, a gantry assembly and a face mill assembly. The spaced apart rail assemblies define an x axis. The gantry assembly is moveably attached to the pair of spaced apart rail assemblies whereby the gantry assembly defines a y axis. The gantry assembly is moveable in the x axis along the pair of spaced apart rail assemblies. The face mill assembly is moveably attached to the gantry assembly and is moveable in the y axis along the gantry assembly. The face mill assembly has a plurality of saw blades, the saw blades being generally in an x-y plane defined by the x axis and y axis. The saw blades have a plurality of teeth that extend downwardly generally in a z axis. The face mill assembly is moveable in the z axis.

A levelling machine includes a pair of spaced apart rail assemblies, a gantry assembly and a face mill assembly. The spaced apart rail assemblies define an x axis. The gantry assembly is moveably attached to the pair of spaced apart rail assemblies whereby the gantry assembly defines a y axis. The gantry assembly is moveable in the x axis along the pair of spaced apart rail assemblies. The face mill assembly is moveably attached to the gantry assembly and is moveable in the y axis along the gantry assembly. The face mill assembly has a plurality of saw blades, the saw blades being generally in an x-y plane defined by the x axis and y axis. The saw blades have a plurality of teeth that extend downwardly generally in a z axis. The face mill assembly is moveable in the z axis.

An example milling machine includes a base and a receiving platform mounted to the base to receive a first workpiece and a second workpiece. The receiving platform is moveable along a first axis. The milling machine also includes a support platform mounted to the base, a first plurality of milling bits to cut the first workpiece, and a second plurality of milling bits to cut the second workpiece. The first plurality of milling bits and the second plurality of milling bits are moveable along a second axis via the support platform. Each milling bit of the first plurality of milling bits and the second plurality of milling bits is to move along a third axis independently.

An example milling machine includes a base and a receiving platform mounted to the base to receive a first workpiece and a second workpiece. The receiving platform is moveable along a first axis. The milling machine also includes a support platform mounted to the base, a first plurality of milling bits to cut the first workpiece, and a second plurality of milling bits to cut the second workpiece. The first plurality of milling bits and the second plurality of milling bits are moveable along a second axis via the support platform. Each milling bit of the first plurality of milling bits and the second plurality of milling bits is to move along a third axis independently.

A horizontal five-axis turning plate type machining center includes a support base, a lathe bed arranged on the support base and a column arranged on the support base, wherein the lathe bed and the column are fixedly connected through a connecting arm, a turning plate device is arranged on the support base, an X-direction sliding plate capable of sliding in an X direction on the lathe bed is arranged on a side, facing the column, of the lathe bed, and a third driving unit capable of driving a workbench to perform position conversion between a turning plate and the X-direction sliding plate is arranged on the turning plate.

Some methods for making a granular material comprise crushing demetallized slag particles with one or more crushers and screening the crushed demetallized slag particles with one or more screens to separate the demetallized slag particles into two or more fractions, the granular material comprising at least one of the fractions of the demetallized slag particles. Prior to the crushing, ones of the demetallized slag particles having a size that is less than or equal to 2 inches can account for at least 90% of the demetallized slag particles. An iron-compound content of the demetallized slag particles, by weight, can be less than or equal to 10%. Crushing and screening can be performed such that ones of the demetallized slag particles of the granular material having a size that is less than or equal to 1.25 mm account for at least 90% of the demetallized slag particles of the granular material.

Three systems for the destruction of the data storage portion of electronic media storage devices such as hard disk drives, solid state drives and hybrid hard drives. One system utilizes a mill cutter with which the hard drive has relative motion in the direction of the axis of the mill cutter to destroy the data storage portion. A second system utilizes a laser to physically destroy the data storage portion. The third system utilizes a chemical solvent to chemically destroy the data storage portion.