Rounding and Truncation of Dimensions

When dimensioned isometrics are plotted, all dimensions are rounded up or down to the nearest mm or 1/16 inch (depending on the units set by the UNITS command). By default, Isodraft carries over the remainder (positive or negative) from a rounded dimension and adds it to the next dimension. Carrying over the rounding remainder reduces cumulative errors over a number of consecutive dimensions, but it can result in identical fittings being shown with different lengths (usually differing by 1mm or 1/16 inch).

If the user wants to suppress this carry over effect, the user can specify that Isodraft truncates all dimensions. The remainders from rounding of the individual dimensions will then be discarded rather than added to the next dimension. To specify truncation, use the TRUNCATE command.