Geometric Tolerance Dialog Box — GstarCAD 2027
Geometric Tolerance Dialog Box
GstarCAD 2027 · Command Reference
Commands > T Command > TOLERANCE > Geometric Tolerence Dialog Box
Function Description:
The Geometric Tolerance dialog box is used to specify the symbols and values for a feature control frame.
After selecting geometry features symbols, the Geometric Tolerance dialog box closes and prompts to specify the location to place the feature control frame.
Dialog Box Options:
Symbol
Selects a geometric characteristic symbol from the Symbol dialog box.
Tolerance 1
Creates the first tolerance value in the feature control frame. The tolerance value means the amount by which the geometric features can deviate from a perfect form. Users can insert a diameter symbol.
- The first box: Clicks the first box to insert a symbol. For example, insert a diameter symbol.
- The second box: Creates a tolerance value. Enter a tolerance value to the second box.
- The third box: Displays the Material Condition dialog box, from which users can select a modifying symbol. These symbols act as modifiers to the geometric characteristic and the tolerance value of features that can vary in size.
Tolerance 2
Creates the second tolerance value in the feature control frame. Specify the second tolerance value in the same way as the first one.
Datum 1
Creates the primary datum reference value in the feature control frame. The datum reference is composed by a value and a modifying symbol. In theory, the datum is an accurate geometric reference, which is a tolerance zone used to create features.
- The first frame: Creates a datum reference value.
- The second frame: Displays the Material Condition dialog box, from which users can select a modifying symbol. These symbols act as modifiers to the datum reference.
Datum 2
Creates the secondary datum reference in the feature control frame, which is in the same way as the primary datum reference.
Datum 3
Creates the tertiary datum reference in the feature control frame, which is in the same way as the primary datum reference.
Height
Creates a projected tolerance zone value in the feature control frame. A projected tolerance zone controls the height variation of the extended portion in the fixed perpendicular part, as well the location tolerance controls the tolerance accurancy.
Projected Tolerance Zone
Inserts a projected tolerance zone symbol after the projected tolerance zone value.
Datum Identifier
Creates a datum-identifying symbol consisting of a reference letter. A datum is a theoretically exact geometric reference from which you can establish the location and tolerance zones of other features. A point, line, plane, cylinder, or other geometry can serve as a datum.