To Define a Manufacturing Assembly Configuration
Creo NC allows you to define a complex manufacturing assembly using an extensive set of techniques. You can assemble parts, regular assemblies, or other manufacturing assemblies, and create parts directly in Manufacturing mode. You can perform the following operations on a manufacturing assembly:
• Assemble a reference model (part or assembly), workpiece (part or assembly), a general assembly, or another manufacturing assembly.
• Create a reference part or a workpiece (part).
• Redefine the assembly constraints of a selected component.
• Disassemble any of the manufacturing assembly components. If you try to disassemble a component that is referenced by an existing NC sequence, you will get an error message. You can then redefine or delete the NC sequence and try again.
You can use these options in any combination and as many times as needed.
In order for the assembly machining NC sequences to be created correctly, the software must "know" which components are reference parts and which are workpieces. As you assemble or create components, you have to classify them.
You can assemble the following types manufacturing models using options on the Manufacturing tab:
• Reference Model (part or assembly)—Click the arrow next to
Reference Model and select
Assemble Reference Model to assemble a reference model. In this case you can specify an assembly or a part. If you specify an assembly, all its components are classified as reference parts.
|  Absolute accuracy is the default for Creo NC. It is important that the absolute accuracy of the reference model and the manufacturing assembly are the same. If you set the enable_absolute_accuracy configuration file option to yes, then when you add the first reference model to the manufacturing assembly, the software informs you of a discrepancy, if any, between the manufacturing assembly accuracy and the reference model accuracy. You can then accept or reject setting the manufacturing assembly accuracy to equal the reference model accuracy. If you accept and the accuracy of the reference model is relative, Creo Parametric regenerates the reference model with absolute accuracy before setting the manufacturing assembly accuracy. |
• Workpiece (part or assembly)—Click the arrow next to
and select
Assemble Workpiece to assemble a workpiece. If you specify an assembly, all its components are classified as workpieces.
• General Assembly— In this case, you can classify the assembly components as either reference models or workpieces. Click Components > Manufacturing Assembly > Assemble and Classify and select all the components (parts or subassemblies) to be classified as reference models.
| By default, all the components in a general assembly are classified by the system as reference models. Therefore, when you assemble a general assembly, you must explicitly classify only the workpiece components. All the components that you have not classified as workpiece components will be considered reference models. |
• Manufacturing Assembly— In this case you can assemble another manufacturing assembly. Click Components > Manufacturing Assembly > Assemble to select the reference assembly. Its reference model or models and workpiece or workpieces will retain their classification in the new manufacturing model. However, any NC sequences that have existed in the manufacturing assembly prior to the current manufacturing process are not accessible here: you cannot display CL data, or modify parameters.
When you create a reference model or a new workpiece, the component is classified as the reference part or the workpiece, depending on the option you use (Reference Model or Workpiece).