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High-Precision Custom CNC Stainless Steel SS420 Conical Burrs - China Suppliers & Factory for Coffee Grinders
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.
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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 burr 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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1
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.
⚙️ Foundation Step -
2
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.
🎯 Tolerance: ±0.005mm – ±0.01mm
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%.
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99% Pass Rate · 9-Stage Inspection
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 used to manufacture conical burrs?
Our conical burrs are manufactured from ultra-durable, food-safe hardened metals, primarily food-grade SS420 stainless steel and high-carbon tool steels such as 9Mn2V and 90MnCrV8. These materials are selected for their exceptional wear resistance, long-lasting sharpness, and compliance with food safety standards.
Q
What is the difference between 3-Axis and 5-Axis CNC milling for burr production?
3-Axis CNC milling handles 2D and 2.5D profiles with a tolerance of ±0.01mm, suitable for standard geometries. 5-Axis CNC milling offers full simultaneous linkage, achieving tighter tolerances of ±0.005mm and a superior surface finish of Ra 0.2µm. The 5-axis process is essential for cutting the complex spiral flutes on the conical surface and reduces setup time by up to 60%.
Q
What tolerances can you achieve in conical burr manufacturing?
We achieve extremely tight tolerances ranging from ±0.005mm to ±0.01mm depending on the machining process used. Our 5-Axis CNC milling centers are capable of the finest tolerances, ensuring perfect edge geometry and consistent grind quality across every burr produced.
Q
How many quality inspection steps are involved in your production process?
We implement a comprehensive 9-stage quality inspection process, covering DFM Analysis, Dimensional Tolerance checks, First Part Inspection, Machining verification, FQC Detection, Material Reports, Surface Treatment evaluation, Packaging inspection, and a final Summary of Issues review. This rigorous process ensures a product pass rate of up to 99%.
Q
Are your conical burrs suitable for both manual and electric coffee grinders?
Yes. Our conical burrs are engineered as the core grinding mechanism for both high-end manual hand grinders and commercial electric coffee grinders. The precision-machined geometry and hardened materials ensure reliable performance in both low-RPM manual applications and high-demand commercial environments.
Q
Can you manufacture custom conical burr specifications for OEM clients?
Absolutely. Our advanced multi-axis CNC machining capabilities and in-house DFM analysis allow us to produce conical burrs to custom specifications. Whether you require a unique burr diameter, tooth geometry, or specific material grade, our engineering team works closely with OEM clients to deliver precision-manufactured burrs that meet exact design requirements.
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