A method for checking a geometry of an electric discharge machining electrode is described. The method comprises the following steps: providing a file containing a native 3D-model of the electric discharge machining electrode; providing a manufactured electric discharge machining electrode based on the native 3D-model; light scanning a set of images of the manufactured electric discharge machining electrode in different positions and generating therewith a scanned 3D-model of the manufactured electric discharge machining electrode; comparing the native 3D-model and the scanned 3D-model and generating electrode compensation coordinates for an electric discharge machining apparatus, to correct an electrode path during electric discharge machining.

An impeller manufacturing apparatus includes an end mill driving unit having an end mill mounted thereon, a material driving unit configured to move a material, and a control device configured to control the end driving unit and the material driving unit to enable a side surface portion of the end mill to machine the material.

A method for checking a geometry of an electric discharge machining electrode is described. The method comprises the following steps: providing a file containing a native 3D-model of the electric discharge machining electrode; providing a manufactured electric discharge machining electrode based on the native 3D-model; light scanning a set of images of the manufactured electric discharge machining electrode in different positions and generating therewith a scanned 3D-model of the manufactured electric discharge machining electrode; comparing the native 3D-model and the scanned 3D-model and generating electrode compensation coordinates for an electric discharge machining apparatus, to correct an electrode path during electric discharge machining.

An internal flow path, throat way, and inlet pathway define a tubular centrifugal impeller. A radius and separation of an upper shroud and lower shroud, and a radius of an inlet section determine a shape of a baseline impeller that comprises a sealed shroud having the radius and including the upper shroud and the lower shroud, which are separated by the separation. The upper and lower shroud are connected by a virtual vane following a first vane path. An internal flow path comprises a spline centerline connecting a series of section areas disposed along the first vane path, with each section area disposed along the spline centerline being connected along the spline centerline to define an internal flow path. The internal flow path is extended to meet the inlet section to define the throat way, together with an inlet pathway extending from the inlet section.