Chapter 23. Positional tolerancing
The essential requirement is to be able to define the limits for location of actual features, e.g., axes, points, median surfaces and nominally plane surfaces, relative to each other or in relation to one or more datum.
To accurately achieve this aim, it is essential that the primary constituents, theoretically exact dimensions, tolerance zones, and datums are utilized. The tolerance zone is symmetrically disposed about its theoretically exact location.
Utilizing these primary constituents ensures positional tolerances do not accumulate when dimensions are arranged in a chain, as would be the case if the feature pattern location were to be specified by coordinate tolerances.
Note: The practice of locating ...
Get Manual of Engineering Drawing, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
