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15 Δεκ 2014 · Concentricity is a 3-Dimensional cylindrical tolerance zone that is defined by a datum axis where all the derived median points of a referenced cylindrical feature must fall within. All median points along the entire feature must be in this tolerance zone.
28 Δεκ 2021 · Concentricity is a 3D GD&T callout that ensures that one or more part features are concentric about a datum axis. However, in GD&T, concentricity has a slightly different meaning than the literal definition that most engineers are aware of.
2 What is GD&T? It is compilation of symbols and rules that effi ciently describe and control dimensioning & tolerancing for all drawings (castings, machined components,etc.). It is documented in ASME Y14.5M which has the symbols, rules, and simple examples. Also ASME Y14.8 has guidance for casting and forging drawings. 3 Why should GD&T be ...
Concentricity (also called coaxially) is a tolerance that controls how far the axis of the controlled feature is from the axis of the datum feature. The callout must refer to a datum. The controlled feature and the datum are cylinders or cones, Internal or external.
Concentricity - Concentricity describes a condition in which two or more features (cylinders, cones, spheres, etc.) in any combination have a common axis. Measurement requirements for concentricity involves the complex task of mapping the referenced feature by way of opposed point measurements.
Practical GD&T: Concentricity – Basic Concepts. Mathematically, concentricity is a very simple concept; the centres of two objects with a clearly defined ‘centre’ (e.g. circles or regular polygons) must be at the same location. The challenge in GD&T is that no measured form is ever a perfect circle, a perfect cylinder, etc.
What exactly is concentricity in GD&T, how can it be measured, and what are its various aspects, applications, and distinctions from runout and position? Let’s explore the details of concentricity to address these questions.
