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A counterbore is a cylindrical flat-bottomed hole that enlarges another coaxial hole, used for fasteners or bearings. Learn about the symbol, comparison with countersink and spotface, and standards for counterbore sizes.
Learn the meaning and usage of various symbols and terms on engineering drawings, such as ASME, AISI, AQL, and more. This list covers common abbreviations for materials, dimensions, standards, and other aspects of engineering drawing.
Spotface is a machined feature that provides a flat, accurately located surface on a workpiece, especially around a bolt hole. Learn about the tools, applications, standards, and contrast with backspotfacing of spotface.
Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian
Learn about engineering fits, the clearance between two mating parts, and how they are defined by ISO and ANSI standards. Find out the different types of fits (clearance, location and interference), their categories (loose, free, close, etc.) and their codes (H7/h6, H8/f7, etc.).
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 ...
Through-hole (leaded) resistors. In electronics, through-hole technology (also spelled "thru-hole") is a manufacturing scheme in which leads on the components are inserted through holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side, either by manual assembly (hand placement) or by the use of automated insertion mount machines.
Incremental improvements in laser process and control technologies have led to substantial increases in the number of cooling holes used in turbine engines. Fundamental to these improvements and increased use of laser drilled holes is an understanding of the relationship between process parameters and hole quality and drilling speed.