Understanding Rest Machining in Fusion 360
Rest machining is an efficient processing technique used to clean up leftover material from a previous cutting operation. By utilizing this method within Fusion 360, users can optimize their machining processes and achieve better surface finishes in complex parts where traditional machining operations may have left material unaddressed.
Setting Up Your Project in Fusion 360
Create or Open Your Design: Begin by launching Fusion 360 and either create a new design or open an existing project that holds the part needing rest machining.
Prepare Your Toolpath: Before diving into rest machining, ensure that you have an initial toolpath set up. This can be done by defining the operations for larger areas and removing most of the material first. Select a larger end mill suitable for the majority of the part’s surface.
- Simulate the Initial Cut: Run a simulation of the initial machining process. This allows you to visualize the material that has been removed and identify areas that might require subsequent finishing operations, especially in corners and other hard-to-reach spaces.
Performing Rest Machining
Select the Tool for Rest Machining: Once the initial cuts are completed, go back to the "Manufacture" workspace. Here, you will define a new setup specifically for rest machining. Choose a smaller tool that can access the remaining areas the larger tool could not reach.
Set Up the New Toolpath: In the toolpath menu, select the "Adaptive Clearing" or "Contour" operation depending on the geometry of your leftover material. The adaptive clearing option is often more efficient for removing material quickly, while contour operations are better suited for detailed finishing.
Specify the Toolpath Settings: When defining the properties, select the "Rest Machining" option. Fusion 360 will automatically detect the areas that are still at or below the specified stock to leave, based on the previous toolpath. Adjust parameters such as step-over and feed rates according to the material and desired finish.
Inspect the Toolpath Preview: Use the toolpath simulation feature within Fusion 360 to check the proposed movements of the new tool. Pay attention to the areas highlighted for machining, ensuring that all uncut edges and corners are accounted for.
Generate and Post Process the Toolpath: After confirming the accuracy of the toolpath, proceed to generate the g-code. You will do this by clicking on the post-process button. Choose the appropriate post-processor for your machine.
- Run the Operation on the CNC Machine: Transfer the generated g-code to your CNC machine. Monitor the machining process to ensure that the rest machining operation is executed correctly and that the finish aligns with your specifications.
FAQs
1. What are the benefits of using rest machining?
Rest machining allows for more efficient machining by reducing the need for multiple tool setups. It optimizes the material removal process by enabling large tools for bulk cutting and finishing tools for precision work.
2. Can rest machining be applied to all types of materials?
Yes, rest machining can be used on various materials including metals, plastics, and composites. However, the choice of tools and parameters should match the specific material properties to ensure optimal results.
3. Is there a specific tool size to use for rest machining?
The best tool size for rest machining depends on the complexity of the part and the size of the remaining material. A smaller diameter tool is typically chosen to access tight spaces, while still ensuring enough stability for effective cutting.
