Sorry, we only have available spots for this course. Would you like to add those to your cart? ASME Membership 1 year has been added to your cart. The price of yearly membership depends on a number of factors, so final price will be calculated during checkout. N - Dimensioning and Tolerancing has been added to your cart. View Cart. Publisher: ASME. Publish Date: Language: English - US. ISBN: Print or Share. Standard Options Format.
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All books are the property of their respective owners. All search results are from google search results. A datum is a theoretically exact point, line, or plane. Without a datum reference, a part can move in three spatial directions or rotate about three different axes. These six movements are known as degrees of freedom.
Referencing a part to datums can constrain these degrees of freedom. Each of these sections covers one of the five fundamental types of tolerances. Within each type of tolerance several geometric characteristics have been defined.
Figure above shows the organization of these characteristics as well as the corresponding symbols. For more on any of the geometric characteristics, click on the embedded link. This section explains how to properly state tolerances for straightness , flatness , circularity , and cylindricity. Form tolerances are not applicable to datums. Angularity , perpendicularity , and parallelism are the three orientation relationships. These tolerances are used to control rotation of a feature relative to a datum.
They cannot be used to control location. Position , concentricity , and symmetry are the three types of location tolerances. These are used to control location of features in relation to each other or relative to a datum. A profile is defined as the outline of a surface. There are two types of profile tolerance — profile of a surface , and profile of a line. The profile of a line tolerance controls the shape of a surface relative to a pre-defined ideal cross section of that surface.
Runout is a tolerance used to control variation in a surface when it is rotated about a datum axis. The surface can be either parallel or perpendicular to the datum axis. Circular runout is the term used to indicate that the runout tolerance applies only to a single surface, while the term total runout indicates that the tolerance applies to all surfaces with rotational symmetry about the datum axis.
Appendices A through E contain additional information. For example, Appendices A and D provide a log of changes from the previous version of the standard and a summary former procedures that are no longer part of the standard.
Finally, Appendix E contains flow charts to help the user develop geometric constraints that best describe design intent.
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