About Arcs
Arcs are created by drawing a straight line and then using the Edit Line group on the Geometry tab to complete the line as an arc. Arcs can be edited at any stage.
Every curved 2D element is transformed into a tangent point arc. Each arc is represented by an approximated series of straight lines. The number of segments is determined by the arc factor, which can be changed by setting the following values in the Change how entities are displayed page of the PTC Creo Schematics Options dialog box:
• Curve factor—If the curve factor is changed, or an arc is magnified, the number of chords used to describe the curve changes sequentially, for example, 3 to 4 to 5.
Large arcs (those greater than 90°) are always processed in sections. Therefore, the number of chords in an arc between 90° and 180° changes according to a 2, 4, 6, 8 sequence; the arc factor of a complete circle changes according to a 4, 8, 12, 16 sequence.
• Max Angle (minimum number of chords)—When the arc factor decreases or the size of the arc increases, the number of chords increases until the maximum number of chords is reached.
• Min Angle (maximum number of chords)—When the arc factor increases or the size of the arc decreases, the number of chords decreases until the minimum number of chords is reached.
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Changing the arc factor for a plot does not change it for the sheet, however, it affects the speed with which the sheet is plotted.
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