Six Basic Considerations When Machining with CNC Routers
Generally, workpieces machined using CNC milling machines have complex shapes and involve numerous machining operations. A wide variety of cutting tools are also employed, and often, after a single clamping, the entire process—from rough machining and semi-finishing to finishing—needs to be completed in one go. Consequently, the resulting program tends to be quite complex. When programming, the following issues should be taken into account:
Generally, workpieces machined using CNC milling machines have complex shapes and involve numerous machining operations. A wide variety of cutting tools are also employed, and often, after a single workpiece setup, the entire process—from rough machining and semi-finishing to finishing—needs to be completed in one go. Consequently, the resulting programs tend to be quite complex. When programming, the following issues should be taken into account:
1. Carefully analyze the drawings to determine a reasonable process route.
2. Select the appropriate dimensions and specifications for the cutting tools, and enter the measured actual dimensions into the tool card.
3. Determine reasonable cutting parameters, primarily including spindle speed, depth of cut, and feed rate.
4. Sufficient space for automatic tool changes should be reserved to avoid collisions with the workpiece or fixtures. It is recommended that the tool-change position be set at the machine’s origin point.
5. To facilitate program inspection and debugging, the processing content for each work step can be arranged into separate subroutines, while the main program primarily handles tool changes and subroutine calls. This approach makes the program both simple and clear.
6. The prepared program must be verified and subjected to a trial run, paying close attention to whether there is any interference between the tool, fixture, or workpiece. When checking the M, S, and T functions, you can do so with the Z-axis locked.
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2018-04-21
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