AutoCAD For Dummies by Bill Fane

Author:Bill Fane
Language: eng
Format: epub, pdf
ISBN: 9781119255819
Publisher: Wiley
Published: 2016-05-06T00:00:00+00:00

Arc Length — DimARc (DAR): Measures the length along an arc, and then applies a curved dimension line that’s concentric with the arc.

Jog — DimJOgged (DJO): When dimensioning arcs, it is standard drafting practice to create a dimension line that starts at the center of the arc and proceeds outward to the arc itself. A problem arises, however, when dimensioning an arc with a very large radius. The center may be at an inconvenient location where the dimension line would interfere with other geometry or, worse, it may be well beyond the edge of the final drawing. DimJOgged neatly solves this problem for you. It works almost exactly like DimARc except that it asks you to specify two extra points. After you select the arc (or circle, strangely enough), it then asks you to specify a center override point and then a location for the jog itself. The resulting dimension line consists of three segments, starting at the center override point: The first and last point to the real center; the middle segment connects the first and last points by putting a jog in the line.

Ordinate — DimORdinate (DOR): Applies X or Y coordinate values from the origin point. Certain types of mechanical parts can have a great many holes and other features. The drawing would become impossibly cluttered if you were to apply two traditional dimensions to show the X and Y locations of each detail. Common practice in this situation is to use ordinate dimensioning. Each ordinate dimension appears simply as a single extension line and a number showing the X or Y distance from the origin (0,0) of the drawing or from the origin of the current user coordinate system (UCS), if there is one. I cover UCSs in Chapter 21. Normal practice is to specify the lower-left corner of the part as the origin. The X and Y values are usually aligned neatly in a row and column along the edge of the part. There are no dimension lines or arrowheads.

Center lines — DIMCENTER: Creates center lines or center marks on circles and arcs without applying a dimension. The definition of lines versus marks matches the current dimension style, as described later in this chapter.

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