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  2. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...

  3. Counterbore - Wikipedia

    en.wikipedia.org/wiki/Counterbore

    A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece's surface. Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such.

  4. Spotface - Wikipedia

    en.wikipedia.org/wiki/Spotface

    Similar to an endmill but with flat-bottom plunging ability. The tool at E, a counterbore, is also often used for spotfacing in manual machining (not so much in CNC machining). A spotface or spot face is a machined feature in which a certain region of the workpiece (a spot) is faced, providing a smooth, flat, accurately located surface.

  5. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    CAD: computer-aided design, computer-aided drafting; cadmium [plating]: CAGE: Commercial and Government Entity [code]: A CAGE code is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the part defined by the drawing.

  6. List of free electronics circuit simulators - Wikipedia

    en.wikipedia.org/wiki/List_of_free_electronics...

    List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE. The following table is split into two groups based on whether it has a graphical visual interface or not.

  7. List of EDA companies - Wikipedia

    en.wikipedia.org/wiki/List_of_EDA_companies

    PCB Design; Circuit Simulation; Altium Designer - PCB Design software, Schematic Capture and Circuit Simulation; Altium Vault - Design Data Management Solution; PDN Analyzer - Power Distribution and Network Analysis (A/C) CircuitStudio - easy-to-use PCB design tool; CircuitMaker - free community-driven PCB design tool for makers

  8. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    A countersink is a conical hole cut into a manufactured object; a countersink bit (sometimes called simply countersink) is the cutter used to cut such a hole. A common use is to allow the head of a bolt or screw, with a shape exactly matching the countersunk hole, to sit flush with or below the surface of the surrounding material.

  9. Via (electronics) - Wikipedia

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

    PCB via current capacity chart showing 1 mil plating via current capacity & resistance versus diameter on a 1.6 mm PCB. In printed circuit board (PCB) design, a via consists of two pads in corresponding positions on different copper layers of the board, that are electrically connected by a hole through the board.