The standard task of dimensioning is to change a CAD construction
into a manufacturing drawing. In parametric systems the dimensioning
also adopts the function of controlling geometry with its dimension
values. To make these two completely different applications as clear
as possible for the user, SISCAD-P offers two different kinds of
dimensions.
The first usual method of dimensioning, the values of which
automatically adapt during geometric modifications, is called
reference dimensioning. This dimensioning references the
current geometrical state.
The second method of dimensioning takes over the control of the
geometry during parametric working and is called parametric
dimensioning. Here the dimension value determines the circumstances,
i.e. the geometry automatically adapts to the modification of a
dimension value.
These two kinds of dimensioning are designated with different
colors, defaults are
yellow = parametric dimension , green = reference dimension .
It is selfevident that the WYSIWYG principle is also valid during
the creation. As soon as you have identified the objects to
dimension, you can place the dimension at the desired position.
The input of other parameters (modification index and other)
is immediately taken into consideration in the dimension figure.
For the determination of the dimension image the user has several
possibilities. The conformity to DIN (German national standard)
rules is one of the most important features, however user-specific
adaptations are possible.
For the modification of a dimension value of a parametric dimension
the command MODIFY NOMINALSIZE is relevant. After the modification
of a dimension value the geometry is modified in accordance with
the construction logic. This logic is determined by the user during
construction. The parametric concept of SISCAD-P provides the suitable
tools for this purpose.