Hard Anodizing – Formula
Essential Question #1
Do you want to learn a clear and concise standard for illustrating tolerances on industrial prints/plans/blueprints?
This blog post will help you learn what GD&T is and how to use it to design accurate parts which can be machined within tolerance.
Essential Question #2
Do you want to learn a drafting standard that is accepted throughout the manufacturing world?
Purpose of GD&T
“Geometric dimensioning and tolerancing (GD&T) is a standardized language used to communicate manufacturing tolerances on prints/plans. GD&T uses symbols to specify exact limits on variation. As a general rule, GD&T is applied according to ASME Y14.5-2009 (revision of ASME Y14.5-1994).” (Hammer p. 172)
Types of Variation
“The parts described on two-dimensional manufacturing prints are three-dimensional objects. Features on three-dimensional objects have up to four different types of variation from their ‘ideal’ design:
- Form or Shape
GD&T does not replace conventional forms of tolerances; rather it supplements them. Conventional, or ‘plus-or-minus,’ tolerances are effective at describing limits on allowable variation for sizes, but when they are applied to locate features or to orient features, there is often ambiguity. GD&T eliminates this ambiguity. Furthermore, the shapes (forms) of surfaces are not controlled by conventional tolerancing. (Hammer p. 173)
- [CNC Cookbook] – GD&T: Geometric Dimensioning and Tolerancing Training https://www.cnccookbook.com/gdt-geometric-dimensioning-and-tolerancing-training/
- [Hammer] – Hammer’s Blueprint Reading Basics, 4th Edition by Charles A. Gillis. Publisher Industrial Press Inc.
- [Olivo] – Blueprint Reading and Technical Sketching for Industry by Thomas P. Olivo. Publisher Nelson Canada. (Olivo)
- [Sealed Source] – Blueprint Reading – https://www.nrc.gov/docs/ML1109/ML110960191.pdf
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