We are happy to see this as we recommend having a loose, general profile on the drawing to avoid disputes with customers over things such as dents or casting errors or, god forbid missing dimension. This will cover your entire part with a loose tolerance that will allow you to reject parts that are out for size, location orientation or form.
This is not new, however, it is great that the standard highlights this as a recommended practice. Previously, whenever any feature of size was toleranced, its size and form both shared the same tolerance zone. Although this is often a workable scenario, there was room for improvement.
The dynamic profile symbol basically overrides the default control and targets only the form or shape of the feature. By doing so, the designer is conveying the intention that regardless of the size of the feature, its form has to be confined in its own, separate tolerance zone.
This gives a tighter control on the shape, without tightening the size tolerance given to the feature. This can be seen in figure 4. The complex shape necessitates the use of this symbol, without which the final part can be so distorted it might not be functional.
The Continuous Feature symbol was introduced in This symbol comes in handy when two or more features sharing the exact same size but have a discontinuity or gap that separates them into two separate features. Figure 5 shows a plate with a slot cut into one of its sides.
Now faces A and B are practically coplanar but appear as distinct features on an engineering drawing, prompting professionals to treat them as different from one another. To indicate this continuity and save time, the CF symbol is added to their description.
The standard requires designers to number features that share the same continuity. This is to be done by including nX n being the number next to each continuous feature. This measure adds clarity to the use and interpretation of this symbol. Moreover, ASME has also made it clear that CF can be used for continuous surfaces as well, which was a point of confusion before.
A summary of some notable ones is given below. Emphasis is placed upon developing skills necessary to clearly analyze, define requirements, specify dimensional functions, datum coordinate locations, inspection of geometric tolerances, and tolerance boundaries and shapes of all geometric and limit tolerance concepts.
The goal of this training is to ensure a common and group-wide understanding of the principles, interpretation and application of geometric dimensioning and limit tolerancing. All classes can be customized to the customers requirements, knowledge sets and end-item product requirements. This class can be customized to the customers requirements, knowledge sets and end-item product requirements.
Because of the widespread use of computer-aided design CAD and the industry transition toward reduced use of orthographic views for product definition, model views were added in many figures throughout the Standard.
This revision also emphasizes the use of profile for location tolerances applied to surfaces. Important changes include: concept of feature of size; datum references and degrees of freedom; composite position tolerances; surface boundaries and axis methods of interpretation; profile tolerances; and symbology and modifiers tools. Additionally, the subject matter has been restructured for better readability, with profile, orientation, and form now in separate sections, and material within sections reorganized.
ASME Y Table of Contents. Y14 Standards Discover our full collection of Y14 standards that guide you across product development. Sorry, we only have available spots for this course. Would you like to add those to your cart? Translation directions x, y, and z and rotation axes u, v, and w represent the six degrees of freedom. Form Tolerances. Orientation Tolerances. Location Tolerances. Profile Tolerances. Runout Tolerances. Appendix B: Fixed vs. Floating Fastener. Did you find the images in this article helpful??
Join the Conversation 2 Comments. Cancel reply Your email address will not be published. Academic Program Discounts and Resources for Professors. On-Site Training Training at your Facility. Search for:. Type of Tolerance. Location in the Standard. Profile of a Line. Profile of a Surface.
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