Using Parameter Symbols in Relations
You can use the following types of parameters in relations:
• Dimension symbols—The following dimension symbol types are supported:
◦ d#—Dimensions in Part or Assembly mode.
◦ d#:#—Dimensions in Assembly mode. The Session ID of the assembly or component is added as a suffix.
◦ rd#—Reference dimensions in part or top-level assembly.
◦ rd#:#—Reference dimensions in Assembly mode. The session ID of assembly or component is added as a suffix.
◦ rsd#—Reference dimensions in Sketcher (section).
◦ kd#—Known dimensions (in parent part or assembly) in Sketcher (section).
◦ Ad#—Driven dimensions in Part, Assembly, or Drawing mode.
• Tolerances—Parameters associated with tolerance formats. These symbols appear when dimensions are switched from numeric to symbolic.
◦ tpm#—Tolerance in plus-minus symmetrical format; # is the dimension number.
◦ tp#—Positive tolerance in plus-minus format; # is the dimension number.
◦ tm#—Negative tolerance in plus-minus format; # is the dimension number.
• Number of instances—Integer parameters for the number of instances in a direction of a pattern.
◦ p#—Where # is the number of instances.
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If you change the instance number to a noninteger value, Creo Parametric truncates it. For example, 2.90 becomes 2.
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• User-defined parameters—Parameters defined by adding a parameter or a relation. For example:
Volume = d0*d1*d2
Vendor = "Stockton Corp."
Vendor = "Stockton Corp."
• System parameters—You can change the values of the system parameters in the > box in the Relations dialog box. The changed values are then used in all models for the current session.
The following parameters are reserved for use by the system:
◦ PI (geometric constant)—Value = 3.14159
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You cannot change this value.
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◦ G (gravitational constant)—Default value = 9.8 meters/sec2(C1, C2, C3, and C4 are default values and equal 1.0, 2.0, 3.0, and 4.0, respectively.)
• Application parameters—You can reference application-specific parameters from the following applications:
◦ Layout
◦ Sheetmetal
◦ Welding
◦ Piping
◦ Cabling
◦ Mechanism
◦ Simulations
◦ Manufacturing