[ALS] modifier
The [ALS] modifier on references makes it possible to unambiguously define a line segment as a datum. This application is mainly used as an alternative method for tolerating cylindricity at larger diameters.
The [ALS] modifier is omitted for parallelism with the Intersection Plane Indicator to determine parallelism between line segments. In combination with roundness, this also provides control over cylindricity.
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Certainly, the ISO standards have expanded considerably in recent years, especially with regard to measurement. Each customer has its own specific applications.
The best way to understand GD&T is to link theory to practice. This will give participants a better feel for the subject.
The standard two-day training is intensive, with customer drawings as a common thread. To work more specifically, a follow-up day is recommended. This gives participants time to look for examples and let everything sink in.
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Would you like more information about the other courses?
Course Geometrical Dimensioning and Tolerancing (GD&T)
Course Model-Based Definition
Course Tolerance study
Course Drawing interpretation