Best PCD Stone Router Bit for Lettering on Granite and Marble

Features of Granite Router Bits for Carving Letters

• Based on years of testing and feedback, the PCD diamond raw materials used to make the blades are the best one selected from more than a dozen types. The manufactured blade has good hardness and long service life.

• The stone engraving bits shank is carefully welded with precision to minimize the chances of tip-off.

• The micro-grinding process is adopted, and the tool has the advantages of fast cutting and low noise.

• This granite router bit has great advantages in completing delicate engraving projects. 

Diamond Engraving Bit Uses

Materials Good For:

Granite, Marble, Bluestone, and more.

Applicable Machines:

Stone CNC Router, Granite CNC Router

Applicable Operations:

Carving small characters & letters, or routing thin lines.

PCD Stone Router Bits Package

• Each marble router bit is packed in a plastic case for well-protection.

• The PCD bits are securely locked in the box to prevent damage caused by collision between the tool and the case during transportation.

Dimension Forms of Best Router Bit for Lettering on Granite Marble

How To Use The Marble Granite Engraving Tools Properly

• The diamond tipped router bits has a single flute. Before starting the carving, the operator must ensure that the spindle rotates clockwise. If the spindle reverses, the blade tip will break quickly.

• As diamond blades are hard and brittle, you'd better replace the chuck and spindle nut regularly to ensure good concentricity of the bit clamping and prevent chipping caused by abnormal vibration.

• If the marble cnc machine ages and the assembly gap increases, it may also cause abnormal vibration during the machining process. In this case, it is recommended to maintain the machine.

Tips for Choosing Proper PCD Router Bit for Granite

Typically, in practice, we can choose the bits according to the letter dimensions to be engraved.

Letters Not Over 15mm

Router bits for marble ET45-0.2 and ET45-0.4 are usually applied to this; In addition, they can also be used for finishing operations on high-hardness and high-value jade reliefs.

Gentle reminder: Since the angles of these two tools are relatively small, the tool body's hardness will be low, so we need to take care and run them at a low speed.

Letters Ranging from 15mm to 30mm

The models including ET70-0.2, ET70-0.4, ET90-0.2, and ET90-0.4 are good for this application. Among them, we mainly recommend ET90-0.4 and ET70-0.4. If you want the engraved characters to be sharper, you can go with ET90-0.2 or ET70-0.2. However, please also be aware that the life of the 0.2 blade tip is relatively shorter compared with the 0.4 one.

Letters Ranging from 30mm to 50mm

For this type of application, there are many models to choose from. They mainly include the following models.

• ET70-0.7

• ET70-1.0

• ET70-1.2

• ET70-1.5

• ET70-2.0

• ET90-0.7

• ET90-1.0

• ET90-1.2

• ET90-1.5

• ET90-2.0

According to their specific engraving needs, users can choose diamond router bits for granite with a tip from 0.7 to 2.0 and an angle of 70 or 90 degrees. The difference between various tip sizes is that a larger tip can decrease the tool path for milling.

The above selection suggestions are for reference only, and specific practices may vary.

Suggested Machining Parameters for Carving Letters on Granite with EagleTec CNC PCD Router Bits

The machining parameters below are for reference only. In actual application, the parameters can be increased or decreased according to the hardness of the stone, the font, and the depth of the lettering.

• Spindle RPM: 24,000 r/min

• Feed Speed: 2,000 mm/min

• Feed Rate: 60%

• Z-axis Feeding: 200 mm/min

• Stepdown: 1.5mm or less

Gentle reminder: ET45 and ET60 granite carving tools have sharp tips and are prone to collapse. You'd better increase the feed rate gradually according to actual conditions and not set a high value initially.

If you like the PCD stone router bit for lettering, please contact us today for pricing & specifications!