A coffee filter includes a metallic member having a flat portion in which tapered exit regions are formed that extend from the bottom of the flat portion to vertices interior to the flat portion. The flat portion is provided with a hole uniformity enhancement region between the top of the flat portion and the exit region vertices that are interior to the flat portion. The top of the flat portion is micro-machined to remove a part of the hole uniformity enhancement region to a predetermined depth into the hole uniformity enhancement region. Holes are formed in the top of the flat portion extending from the micro-machined top of the flat portion through the hole uniformity enhancement region to the vertices of the tapered exit regions. The predetermined depth of the micro-machined top of the flat portion is selected to prevent the micro-machined top of the flat portion from meeting the tapered exit regions to promote and maintain uniformity of the holes.

A coffee filter includes a metallic member having a flat portion in which tapered exit regions are formed that extend from the bottom of the flat portion to vertices interior to the flat portion. The flat portion is provided with a hole uniformity enhancement region between the top of the flat portion and the exit region vertices that are interior to the flat portion. The top of the flat portion is micro-machined to remove a part of the hole uniformity enhancement region to a predetermined depth into the hole uniformity enhancement region. Holes are formed in the top of the flat portion extending from the micro-machined top of the flat portion through the hole uniformity enhancement region to the vertices of the tapered exit regions. The predetermined depth of the micro-machined top of the flat portion is selected to prevent the micro-machined top of the flat portion from meeting the tapered exit regions to promote and maintain uniformity of the holes.

A robotic working line and associated method for the production of cutting bodies for prosthetic surgery instruments starts with hollow untreated components and includes an automated three-dimensional laser cutting station with a first automated operator configured to pick up untreated components from a transport support and supply it to a laser cutting apparatus having a second automated operator provided with a laser cutting head that is configured to make both through holes and optional auxiliary apertures to obtain semi-finished components. An automated grinding station receives the semi-finished components and includes a third automated operator configured to place each of the semi-finished components in cooperation with one or more grinding tools in order to obtain ground components. An automated punching station includes a fourth automated operator to place each of said ground components in cooperation with a press device configured to perform a punching working on each hole.

A coffee filter qualification system receives user-specified filter criteria relating to acceptable attributes for a plurality of apertures included in a liquid brewing filter. A light source illuminates the apertures of the liquid brewing filter and a machine vision camera images the apertures of the filter. A filter qualification information handling system (IHS) determines if the liquid brewing filter meets the predefined user-specified filter criteria. The filter qualification IHS accepts the liquid brewing filter if the filter meets the filter criteria, and otherwise rejects the filter. The filter criteria may include the total cumulative area of the apertures, individual aperture area, aperture count and aperture acircularity information.

A method for manufacturing injection openings of a fuel injector, including: manufacturing a prechamber with the aid of a mechanical, cutting method, in particular with the aid of milling or drilling or with the aid of laser ablation, producing a radius at the transition of the prechamber between a prechamber wall and a prechamber base with the aid of a laser, and/or introducing grooves into the prechamber wall and/or the prechamber base, and manufacturing a spray hole in the prechamber base.