Constructing Features Part features are constructed from one or more parent features contained within the Feature List. The following feature constructions are supported by the M2 system: • Points • Lines • Circles and arcs • Distances • Angles Features can be constructed from positional and non-positional parents. For the purposes of constructing features, the center points of positional features are used as points. The number of points required for the feature construction is identical to the number required for feature measurement and is discussed in detail in Points Required for Feature Measurements contained in Section 3: Probes. Positional features include: • Points • Circles and arcs
Non-positional features include: • Lines • Distances • Angles Point Constructions Point constructions include: •
Average point from any combination of positional features • Center point of circle or arc • Start point, Center point, endpoint, or anchor point of a line. The anchor point is the point on the line closest to the datum. • Start point and endpoint of a distance • Apex point of an angle • Midpoint between two positional features • Intersection of two lines • Intersection 1 or 2 between circle and circle, arc and arc or circle and arc • Intersection 1 or 2 between line and circle or line and arc • Point online perpendicular to a positional feature • Tangent point 1 or 2 on circle from a point Circle Constructions Circle constructions include: • Gauge circle between lines using parent lines and created circle (discussed later) • Gauge circle between two arcs using parent arcs and created circle (discussed later) • Gauge circle between three lines with circle tangent to each line • Bolt circle from three or more circles • Average circle from three or more circles • Circle from three or more positional features • Duplicate circle • Circle from arc
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