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Custom CNC Metal Machining Suppliers - China Factory Conical Burrs for Coffee Grinders in Stainless Steel SS420
What Are Conical Burrs?
The conical burr is the essential core mechanism—the "engine"—of high-end manual hand grinders and commercial electric coffee grinders. It consists of two mating parts: a cone-shaped inner burr with spiral, sharp cutting flutes, and a serrated outer ring burr.
To withstand the intense friction of daily grinding while maintaining food safety, we manufacture these burrs from ultra-durable, hardened metals. Our primary materials include food-grade SS420 stainless steel and high-carbon tool steels (such as 9Mn2V and 90MnCrV8), ensuring long-lasting sharpness and exceptional wear resistance.
How We Manufacture Conical Burrs
Manufacturing a world-class conical burrs requires uncompromising industrial precision. The complex geometry of the cutting teeth leaves no room for error. Here is how we turn raw steel into a masterpiece of coffee engineering:
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⚙High-Precision CNC Turning We begin by feeding solid bar stock into our precision CNC turning centers. We machine the basic blank profiles for both the inner cone and the outer ring. This critical first step establishes perfect concentricity—ensuring the burr will not wobble or misalign during operation, which is vital for an even grind.
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⚙Multi-Axis CNC Milling Cutting the complex, sweeping spiral teeth (flutes) onto the conical surface is the most demanding step. We utilize advanced 3+2 Axis and simultaneous 5-Axis CNC milling to execute these intricate 3D toolpaths. This technology allows our cutters to move seamlessly across the curved surfaces, achieving extreme tolerances of ±0.005mm to ±0.01mm for flawless edge geometry.
Our Manufacturing Capability
3 Axis CNC Milling
- ✔ Feature: 2D / 2.5D Profiles
- ✔ Tolerance: ±0.01MM
- ✔ Max. Diameter: Ø800 mm
5 Axis CNC Milling
- ✔ Setup Time: -60%
- ✔ Linkage: Full Simultaneous
- ✔ Tolerance: ±0.005MM
- ✔ Surface Finish: Ra 0.2µm
9 Quality Inspection Processes
Produced to high industry standards, delivering conical burrs with a pass rate of up to 99%.
DFM Analysis
Dimensional Tolerance
First Part Inspection
Machining
FQC Detection
Material Report
Surface Treatment
Package
Summary of Issues
Frequently Asked Questions
Q What materials are your conical burrs made from?
Our conical burrs are manufactured from food-grade SS420 stainless steel and high-carbon tool steels such as 9Mn2V and 90MnCrV8. These materials are selected for their exceptional hardness, long-lasting sharpness, and outstanding wear resistance, ensuring safe and durable performance in daily coffee grinding.
Q What machining tolerances can you achieve for conical burrs?
Using our advanced 5-Axis CNC milling technology, we achieve tolerances as tight as ±0.005mm, while our 3-Axis CNC milling operations maintain tolerances of ±0.01mm. This level of precision ensures perfect cutting geometry and consistent grind quality across every burr we produce.
Q Are your conical burrs suitable for both manual and electric coffee grinders?
Yes. Our conical burrs are designed to serve as the core grinding mechanism for both high-end manual hand grinders and commercial electric coffee grinders. We can customize burr dimensions, tooth geometry, and material specifications to meet the exact requirements of your grinder design.
Q What quality inspection processes do you apply to each burr?
Every conical burr goes through 9 rigorous quality control stages: DFM Analysis, Dimensional Tolerance verification, First Part Inspection, Machining process monitoring, FQC Detection, Material Report review, Surface Treatment inspection, Packaging check, and a final Summary of Issues review. This comprehensive process ensures a product pass rate of up to 99%.
Q Can you manufacture custom conical burr designs for OEM or private label brands?
Absolutely. We specialize in OEM and custom manufacturing. Our engineering team can work from your existing drawings or collaborate with you from the design stage. With our full 5-Axis CNC capability, we can produce complex custom burr geometries to match your brand's performance specifications and aesthetic requirements.
Q What is the surface finish quality of your conical burrs?
Our 5-Axis CNC milling process delivers a surface finish of Ra 0.2µm, which represents an exceptionally smooth and precise cutting edge. This high-quality surface finish reduces friction during grinding, contributes to a cleaner grind profile, and extends the operational lifespan of the burr.
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