The design and toolpath work shown here is done in VCarve Pro. These bits can also be used to flatten slabs, cutting boards and other projects on your CNC. But you’ll appreciate the way larger bits, 1-1/2” (middle), or 2” (right), get the work done more quickly. That being said, a 3/4" straight bit, left, will provide the same results as a larger diameter cutter. Nearly any flat bottom bit can be used for fly cutting, but a large diameter bit will allow the work to go faster because it requires fewer passes. It’s important to know the exact thickness of your material to get this right, and you can’t beat digital calipers for getting that precise measurement. 020” more than the material thickness is plenty. Minimize the frequency of needing to fly cut the spoilboard by cutting as little as possible beyond the workpiece. When using your CNC you will, in all likelihood, periodically cut all the way through your pieces. It can also refer to the work you would do to level a piece of stock like a large slab that still has sawmill marks in it. This guarantees that the surface of the spoilboard is perfectly parallel to the travel of the spindle.įly cutting is the process of leveling the spoilboard to make it flat again. You should also fly cut the spoilboard on a brand new CNC machine. When your spoilboard starts to look like the surface of the moon, or a small-scale version of that, it needs to be fly cut. Not in the sense that you’ll throw it out and get a new one, but in the sense that your toolpaths will cut into it and, over time, the surface of the spoilboard will be far from flat. The spoilboard on your CNC router is a disposable commodity.
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