Excellon file:

A text-based computer data file which is used to control the actions of a CNC drilling machine, commonly used in the drilling of printed circuit boards. The name Excellon comes from the Excellon company, founded in Torrance California USA in 1963 by inventor Joseph Smith. The Excellon driller was designed specifically for the purpose of drilling holes in printed circuit boards. The holes in early, single- and double-sided printed circuit boards were used to allow the insertion of the wire leads on electronic components. Following the invention of multilayer printed circuit boards, the holes were used both for the insertion and connection of wire component leads, and for interconnecting the circuit traces between the multiple copper layers of the circuit boards. Holes created for the sole purpose of interconnecting traces on different layers of a multilayer circuit board are called via holes. A CNC Turning Center The abbreviation CNC stands for Computer(ized) Numerical(ly) Control(led), and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the... Close-up photo of one side of a motherboard PCB, showing conductive traces, vias and solder points for through-hole components on the opposite side. ... Excellon A CNC machine manufacturer in Torrance, California, USA. Excellon machines are used in the manufacture of printed circuit boards, for the purposes of drilling holes and then routing (cutting the individual circuit boards out of the large rectangular panels in which they are manufactured). ... Close-up photo of one side of a motherboard PCB, showing conductive traces, vias and solder points for through-hole components on the opposite side. ... Close-up photo of one side of a motherboard PCB, showing conductive traces, vias and solder points for through-hole components on the opposite side. ... Close-up photo of one side of a motherboard PCB, showing conductive traces, vias and solder points for through-hole components on the opposite side. ... There are two companies that go by the name VIA: VIA Technologies, a Taiwanese manufacturer of integrated circuits VIA Rail, a Canadian passenger rail company VIA is also an acronym for: Versatile Interface Adapter Other Uses: Via is commonly used as a delineation of connection, as in when somebody says...

The Excellon file format is a variant of standard RS-274C. It consists of commands to instruct a CNC drilling machine to drill holes of specific diameters at specific locations on a printed circuit board panel. A CNC Turning Center The abbreviation CNC stands for Computer(ized) Numerical(ly) Control(led), and refers specifically to the computer control of machine tools for the purpose of (repeatedly) manufacturing complex parts in metal as well as other materials, using a program written in a notation conforming to the...

Since about 1999, most of the holes drilled into circuit boards are via holes, and the components are built without wire leads, but solderable pads instead. These components are called surface-mount components. There are two companies that go by the name VIA: VIA Technologies, a Taiwanese manufacturer of integrated circuits VIA Rail, a Canadian passenger rail company VIA is also an acronym for: Versatile Interface Adapter Other Uses: Via is commonly used as a delineation of connection, as in when somebody says... Surface-mount components on a keydrives circuit board Surface mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). ...