The extension line connects the dimension line (on which the value of the measurement is placed) # ���� P � O �������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������� q � n bjbjt+t+ ). 6. 2. 2. OJ QJ UVhmH nH j U"j��= Notes can be placed inside dimension lines; that is to say, between the dimensions and the object drawn. Leader lines should point away from the first or last line of a given note, never from the center, and should connect with the material to which it refers. Dimension lines should be set apart from object lines by spacing and line weight so that the chance of their being mistaken becomes minimal; extension lines are taken perpendicularly from the building lines out to the dimension lines. ' This will result in an uncomplicated system of leader lines. The … It is a good idea to group notes around the construction to which they refer. AutoCAD Architectural Dimensioning CAD Fundamentals I CAD Fundamentals I Architectural Dimensioning AutoCAD Information Architectural Dimensioning CAD Fundamentals I Construction Drawings ARCH 411 � � � � � Standard Practices- Reading Direction All dimension and note text must be oriented to be read from the bottom of the drawing (relative to the drawing format). 1. OJ QJ UVhmH nH "j��= The limits of any series should be marked by showing their extension and dimension lines and arrowhead designators. The draftsperson must decide whether to use 12 inches or the symbols for feet and inches (12� or 1�-0�). Notes and dimensions should not be placed in a haphazard manner merely to fill gaps; they must be done in a methodical way and with due thought given to their placement and extent. All drawings should agree - most of all with the specifications. Extension and dimension lines should be kept light in value but should have enough line weight to reproduce in their entirety. Architectural Symbols and Conventions Architectural Drafting Line Work Arrowheads are drawn freehand. ��ࡱ� > �� ! A column, for instance, would have a centerline running in both directions. A note may contradict the dimension given; for example, a 2x4 stud may show a measurement of one and one-half inches (1 ��) by three and one-half inches (3 ��). Similar dimensions should, however, never be duplicated on the same drawing. 3. In some instances crossed lines cannot be prevented, but placement should be made with the greatest care possible to obviate confusion. The arrowhead or other designator should point to an exact extension line. ; = > E F a b c d � � � � � � � � � � � � � � � � � � � Notes: 1. Obvious dimensions may sometimes be eliminated. Notes should always be concisely phrased to make a point that could be difficult and cumbersome to display in a drawing. Extension lines should be started 1/16" from the object , and extend beyond the dimension line by 1/8". 9. The minimum should be a full line height or half the height of the lettering. Technical product specification standards specify the following conventions when dimensioning drawings. All dimension, extension, and leader lines should be thin, sharp, dark lines (.5mm/2H). EMBED AutoCAD.Drawing.15 11. A door place in a narrow hallway does not necessarily have to be dimensioned, the inference being that the door will be centered. 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