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2. Electrical discharge machining - Wikipedia

   en.wikipedia.org/wiki/Electrical_discharge_machining

   Fast hole drilling EDM was designed for producing fast, accurate, small, deep holes. It is conceptually akin to sinker EDM but the electrode is a rotating tube conveying a pressurized jet of dielectric fluid. It can make a hole an inch deep in about a minute and is a good way to machine holes in materials too hard for twist-drill machining.

3. Rule-based DFM analysis for electric discharge machining

   en.wikipedia.org/wiki/Rule-based_DFM_analysis...

   Electrical discharge machining (or EDM) is one of the most accurate manufacturing processes available for creating complex or simple shapes and geometries within parts and assemblies. A machining method typically used for hard metals, EDM makes it possible to work with metals for which traditional machining techniques are ineffective.

4. Hole drilling method - Wikipedia

   en.wikipedia.org/wiki/Hole_drilling_method

   The hole drilling method is a method for measuring residual stresses, [1] [2] in a material. Residual stress occurs in a material in the absence of external loads. Residual stress interacts with the applied loading on the material to affect the overall strength, fatigue, and corrosion performance of the material.

5. Copper tubing - Wikipedia

   en.wikipedia.org/wiki/Copper_tubing

   Compression fittings use a soft metal or thermoplastic ring (the compression ring, "olive" or "ferrule"), which is squeezed onto the pipe and into the fitting by a compression nut. The soft metal conforms to the surface of the tubing and the fitting and creates a seal.

6. Via (electronics) - Wikipedia

   en.wikipedia.org/wiki/Via_(electronics)

   A via (Latin, 'path' or 'way') is an electrical connection between two or more metal layers of a printed circuit boards (PCB) or integrated circuit. Essentially a via is a small drilled hole that goes through two or more adjacent layers; the hole is plated with metal (often copper) that forms an electrical connection through the insulating layers.

7. Deep hole drilling - Wikipedia

   en.wikipedia.org/wiki/Deep_hole_drilling

   On the one hand, there are tools with an asymmetrical single cutting-edge design. These deep hole drilling tools include single-lip deep hole drills, the single-tube system (BTA deep-hole drilling) and the double-tube system (ejector deep-hole drilling), which are referred to as the "classic" deep hole drilling processes. On the other hand ...