Buying-guide

1. Understanding Your Grinding Application

Selecting the right diamond grinding tool begins with a clear understanding of your specific application. Different materials, machine types, and finish requirements demand different tool configurations. Below is a quick-reference guide to help you match your application to the appropriate product family.

💡 Pro Tip: If your application is not listed here, our engineering team can help identify the optimal tool configuration. Contact us with your material type, machine specs, and desired finish.

2. Diamond Grinding Wheels – Selection Guide

Diamond grinding wheels are the backbone of precision machining for hard and brittle materials. When selecting a wheel from our Grinding & Cutting Wheels range, consider these five critical parameters:

2.1 Bond Type

The bond system determines how diamond grains are held in the wheel and how they release when worn:

2.2 Grit Size (Mesh)

Diamond grit size directly affects surface finish and material removal rate:

• Coarse (#30 – #60): High stock removal, rough finishing. Ideal for stone and heavy glass grinding.
• Medium (#80 – #180): General-purpose grinding. Best balance of speed and finish for most industrial applications.
• Fine (#200 – #400): Precision finishing. Produces smooth surfaces on carbide and ceramic components.
• Ultra-Fine (#600 – #3000): Mirror-finish polishing. Used in optical and mold & die applications.

2.3 Concentration

Concentration refers to the density of diamond particles in the bond matrix. Common values include:

• C50 (Low): Cost-effective for light-duty grinding. Best for soft, non-ferrous materials.
• C75 (Medium): General industrial use. Suitable for most glass and ceramic grinding operations.
• C100 (High): Maximum performance for heavy stock removal. Recommended for carbide and hard ceramics.
• C125+ (Extra High): Specialized applications requiring extreme tool life, such as continuous CNC production.

2.4 Wheel Shape & Profile

RONGDA offers standard and custom profiles to match your grinding geometry:

2.5 Wheel Dimensions

Always verify three critical dimensions before ordering:

• Outer Diameter (D): Must match your machine’s maximum and minimum wheel capacity.
• Hole/Bore Size (H): Must fit your spindle or flange configuration accurately.
• Thickness (T) / Rim Width (X): Determines grinding width and stock removal capacity.

3. Drill Bits – Choosing the Right Tool for Hole Making

Our Drill Bits category covers core drills, chamfering bits, and specialty drilling tools for glass, ceramics, stone, and composite materials. The right drill bit depends on three factors:

3.1 Material to Be Drilled

• Glass & Quartz: Use electroplated diamond core drills with continuous rim for clean, chip-free holes.
• Ceramic Tiles & Slabs: Use sintered metal-bond core drills with segmented rim for faster penetration.
• Stone & Marble: Use vacuum-brazed diamond core drills for maximum cutting speed and durability.
• Composite Materials: Use thin-wall diamond core drills to minimize delamination at exit.

3.2 Hole Depth & Diameter

• Depth-to-Diameter Ratio: For holes deeper than 3× diameter, consider step-drilling or pecking cycles.
• Diameter Range: RONGDA drill bits are available from Ø3 mm to Ø300 mm standard, with custom sizes up to Ø600 mm.
• Chamfering Requirements: If a chamfered edge is needed, consider combination drill-chamfer bits for a one-pass operation.

3.3 Machine Compatibility

• Handheld Drills: Use drill bits with hex shank or threaded connection for secure mounting.
• CNC Machines: Use precision-ground shanks (h6 tolerance) for accurate positioning and repeatable results.
• Drilling with Coolant: Always use water or water-soluble coolant to extend tool life and improve hole quality.

4. Grinding Tools – Mounted Points, Discs & Specialty Tools

The Grinding Tools category encompasses mounted points, cutting discs, profile wheels, and custom-shaped tools for specialized operations. Here’s how to navigate this versatile range:

4.1 Mounted Points

Ideal for internal grinding, mold finishing, and intricate detail work:

• Cylindrical (Shape CY): For general internal grinding and surface contact.
• Ball (Shape B): For concave radii and curved-surface finishing.
• Inverted Cone (Shape IJ): For thread grinding, gear roots, and acute-angle applications.
• Tree Shape (Shape T): For complex profile grinding in die cavities.

Select shank diameter (typically Ø3 mm, Ø6 mm, or Ø1/4″) to match your spindle collet.

4.2 Cutting Discs

Thin diamond cutting discs for slotting, dicing, and precision cut-off operations:

• Thickness: 0.5 – 3.0 mm standard. Thinner discs reduce kerf loss but require stable machine conditions.
• Diameter: 50 – 300 mm standard. Larger diameters allow deeper cutting depths.
• Bond Recommendation: Resin bond for steel-related cutting; metal bond for glass and ceramics.

4.3 Custom-Profile Tools

For non-standard geometries — such as stepped profiles, angled faces, or multi-radius forms — RONGDA’s engineering team can design and manufacture custom diamond tools to your exact specifications. Lead times are typically 7–15 working days for custom profiles.

✅ RONGDA Advantage: Custom tooling is a core strength. Send us your part drawing or target workpiece profile, and our team will propose the optimal diamond tool design — often at competitive pricing compared to standard catalog alternatives.

Need Expert Guidance?

Not sure which tool is right for your application? Our technical sales team can review your requirements and provide a tailored recommendation within 24 hours.

Get Expert Advice