Unit 6 introduces the concept of assembly modeling. Assembly models are prt files that contain pointers to one or more other files. It is important to fully understand the structure of assembly models. For both of these assignments it is important to put all files in the same directory (one for each assignment).
Assignment – Bottom-up Assembly
Assemble the following components with this structure (this is an example of the bottom-up assembly method:
- Main assembly – includes crankcase subassembly (DO NOT START HERE)
- Crankcase subassembly (START HERE)
- Needle subassembly
- Carburetor subassembly
- Exhaust subassembly
JT Files
Assignment – Mini Bike Frame
This assignment introduces NX Curves and Associative Copy commands. You will create three files:
- Assembly.prt
- Right.prt
- Left.prt
Frame Points – Rider’s Right Side
Before you Begin
Start the first model.
Before you use the “New Component” command, make this important change:
Menu -> Preferences -> Assemblies (Under the Component tab)
Command Part Template Type
Set all to “Select from File New”
To make the right side frame:
- First create points 1 through 5.
- Connect with line curves
- Fillet with arc curves
- Menu -> Insert -> Curves -> Lines and Arcs
- Then use Arc (tan-tan-radius)
- Use tube command
- Insert -> Sweep -> Tube
- Tube OD: .875
- Tube ID: .795
- IMPORTANT: From pulldown, select Tangent Curves – Follow Fillet
- Note: It is a good idea to group the curves into a single group.
To make the left side frame:
- Create a parent assembly that will become the frame assembly.
- Go to the assembly and create a new component (just an empty part).
- This will become the left. Give it the name of the left side.
- Stay in the assembly, but make the new part you just created (left side) the “work part.”
- Insert -> Associative Copy -> Wave Geometry Linker
- Set type to “mirror body”
- Make sure “fix at current timestamp order” is off.