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CNC Engraving tools
Industrial quality CNC engraving bits
There is an inherent overlap and confusion in the modern stone industry as regards carving and engraving. Engraving refers to etching, lettering, or writing alphanumeric characters and symbols and conducting fine-finishing operations on stone whereas carving, similar in concept, function, and meaning, refers more to the roughing out of shapes, complicated figures, and sculpturing. The distinction is clear in some applications, in others it may be vague. If you are looking for an engraving tools, you might actually need a carving tool. If you don’t find what you want here, we strongly recommend you peruse our carving tools as well.
Diamond-tipped bits for CNC machines to work stone, marble, granite, and ceramics
These professional CNC machine and router bits are used extensively by stone fabricators for engraving, sign-making, etching, lettering, writing, and finishing. They are used in the funerary arts and to manufacture marble or granite products.
These tools have a cylindrical shank and are characterized by a 120°,90°, 60°, or 30° angle with a rounded or flat tip. They are also called V-carving bits, V-tip tools, sign-making bits, writing bits, and lettering bits.
Applications: Stone and marble letters engraving, finishing in tombstones, monuments, and memorials.
Based on the material to be cut, three families of tips are used:
- Carbide-tipped tools for marble working. Typically used for engraving, writing, and finishing marble and soft stone materials.
- Electroplated diamond bits. These are mainly used for marble engraving but some diamond electroplated bits are specifically designed for working ceramic and granite, such as the Pink Line bits; try them, they are amazing!
- Polycrystalline Diamond bits (PCD tools) for writing and engraving granite and ceramic.
For more information see: Carbide and Polycrystalline bits for Marble and Granite
What feed and plunge rate should I use with my marble or granite engraving bit?
Each product page shows the recommended operating parameters. These are generic parameters referring to bits used on a sturdy CNC router operating without significant vibrations.
Generally speaking, the operating parameters can be changed in accordance with the following rule: “the smaller the cutting depth per pass, the greater the feed rate”
- for a cutting depth of 3mm per pass, the feed rate can be 80 – 100 mm/min
- for a cutting depth of 2mm per pass, the feed rate can be 150 mm/min
- for a cutting depth of 0.5 – 1mm per pass, the feed rate can be 400 mm/min
If we increase the feed rate, we also need to increase the bit speed of rotation.
As regards the plunge rate, we recommend that you don’t exceed 100 – 120mm/min and execute ramp plunge moves at an angle of 10 – 20° with respect to the material surface.
Make sure to use plenty of water to cool the tip.
Almost all bits come with a bored version to allow internal water flow for more effective cooling.
How to choose the best tip angle for my engraving bit?
When engraving with your CNC router, the main factors you need to consider are the desired width and depth. With these values in hand, it is easy to choose the best tip.
For a given groove depth, the cutting width is a function of the tip angle. It will increase the deeper you plunge into the material as a function of this angle. The ratio of the plunge depth to the engraving width is determined by the angle of the tip cutting-edge. The sketch below shows the relationship between cutting width and depth.