Conditions for Placing a UDF Using an On-Surface Coordinate System
To effectively place User-defined Features (UDF) by means of an on-surface coordinate system, create the UDF and follow the placement procedure bearing in mind the following conditions, sequences, and restraints.
• When you define a UDF, if the first feature of the UDF is an on-surface coordinate system, the references and dimensions of the on-surface coordinate system are considered for the UDF definition. You are prompted to specify the reference prompts of the references of the on-surface coordinate system, but these prompts are not displayed during UDF placement.
• If a reference is used by the on-surface coordinate system and any other feature, you can select between single and multiple prompts. The reference prompts related to an on-surface coordinate system do not display during UDF placement.
• When you place the UDF, the references for the on-surface coordinate system and the references for other UDF features are independent, even if the references are shared in the reference part.
• Dimensions, parameters, and relations behave in the following ways:
◦ Dimensions of the on-surface coordinate system are selectable as variable dimensions, but they are not displayed on the Variables tab during UDF placement.
◦ Parameters of the on-surface coordinate system are selectable as variable parameters.
◦ Relations and parameters of the on-surface coordinate system are carried over with the UDF.
• External parameters and dimensions used in relations:
◦ That drive dimensions of the on-surface coordinate system do not become part of the UDF definition.
◦ That drive parameters of the on-surface coordinate system become part of the UDF definition.