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CNC Router Essentials

Toolpath Essentials : 3

Additional useful bits

V-bits are most commonly used for V-carving text and other fine details, Image 3.2. The smaller the angle of the V-bit, the finer the details it will be able to cut.

Ballnose and core box bits are available in a variety of diameters and lengths, Image 3.3. Tapered ballnose bits are used for finishing intricate 3-D carvings. Like V-bits, smaller bits will create more intricate details.

A spoilboard or fly cuer bit is helpful, but not imperative when starting out, Image 3.4. This type of bit is used to level the spoilboard on your machine. With its large diameter, it can cover a big area quickly. You can also surface your spoilboard with something more common, such as a " straight bit. It just takes longer.

Which bits you’ll need for your work depends largely on the types of projects you plan to make, but here is a short list of bits that will get you started, and you can add to it as your needs expand.

Image 3.4: A large diameter spoilboard bit is used to surface the MDF table when it becomes rough.

Image 3.2: V-bits are available in different diameters and angles. They are mostly used for V-carving.

Image 3.3: Ballnose and core box bits are available in a variety of diameters and lengths. Smaller diameters are tapered to increase strength and reduce breakage. Spiral ballnose bits are commonly used to machine intricate 3-D carving designs. For shallow low-detail carvings, a core box bit works well. Both bits can be used to create fluted designs.

As you do more with your machine you may want to add: • 30° V-bit (fine V-carving and details)

• "- and "-diameter ballnose bits (3-D carving)

• "-diameter downcut spiral straight bit (general cutting)

• "-diameter straight bit (fine profile and pocket cuts)