SECTION 1:  Guidelines for Dimensioning



LS3P standard dimensions are relative.  With relative dimensions all lines, arrowheads, arcs, and text are drawn as a single dimension object.  In general, relative dimensions are easier to maintain because they can be modified as a single object.  Relative dimensions are based on the actual distance or size of the entities being dimensioned.  The distance is calculated and the appropriate dimension text is entered above the dimension line.

The standard font for dimensions is the same as general text, 3/32" Arial True Type font. Dimensions, as well as most annotations, should be done in the model views and NOT in the sheets. Strokes or tic marks are used as the standard terminator for all dimensions.  A filled dot terminator and symbol are used when a dimension is to denote a centerline. If in the process of dimensioning, any part of the dimension is incorrect, i.e. Dimension text, correct the source. Using other corrective measures can lead to mistakes if the object being dimensioned is modified.  Instead, go back and verify that the entity being dimensioned is graphically correct and check to make sure the correct dimension style is being used.  The only exception for this rule of thumb is in the case of equal dimensions where the dimension is replaced with the word “EQUAL” or the abbreviation “EQ”.

When dimensioning the exterior of a building, start with the largest dimension and add dimension strings that get more specific as you work your way in. Start with an overall dimension and then add a dimension string for the column centerlines. If the building has offsets, they would be the next dimension string. Then the openings of the building would be dimensioned, always referencing them back to a column centerline.

When dimensioning interior partitions, it is acceptable to use a preferred method as long as you ALWAYS NOTE the method on the sheet containing the dimensions!  Start dimensions from a reliable, stationary reference point such as a column centerline or exterior wall.