T-FLEX Parametric CAD. Fundamentals. 2D Design

Fundamentals. Two-Dimensional Design
GD&T Symbol Parameters
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Each time when you fix the position of a GD&T or
datum symbol, the “GD&T Symbol parameters”
dialog box comes up for defining the necessary
parameters. Different sets of parameters are provided
for the datum and the GD&T symbols. In the case of
the GD&T symbol, the dialog box “GD&T symbol
parameters” is displayed.
First, select the desired tolerance type:
Next, enter its parameter values:
Expression. Can be one of the following choices:
- not defined;
R - if a circular or cylindrical GD&T symbol is defined by the radius;
D - if defined by the diameter;
Sphere R - if a spherical GD&T symbol is defined by the radius;
Sphere D - if a spherical GD&T symbol is defined by the diameter;
- if the diametrical expression is used for GD&T symbol of Symmetry, Axis
crossing, Profile form and Surface form, as well as the positional GD&T symbol
T
(in the case when the positional GD&T symbol is bounded by two parallel lines
or planes);
T/2 - if the radial expression is used for the same GD&T symbols as above.
Set divergence. Sets the way of defining the tolerance. You can either enter the tolerance manually or have
it calculated automatically based on the dimension value and the accuracy.
Dimension. This is the value of the dimension that defines the tolerance value. If you set a relation with a
dimension when creating the GD&T symbol, then this parameter automatically displays the nominal
dimension value. The dimension value drives the tolerance value when the latter is calculated
automatically. To set the relation between the “Dimension” parameter and a drawing dimension, select
the desired dimension by using the option . In this case, the tolerance value is automatically
recalculated once the dimension value is modified.