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Custom CNC Machining Stainless Steel SS420 Coffee Grinder Burrs - China Suppliers & Factory
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 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:
Step 01
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.
Step 02
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 used to manufacture your 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 ensure long-lasting sharpness and exceptional wear resistance under daily grinding conditions.
Q
What is the difference between 3-axis and 5-axis CNC milling for conical burrs?
3-axis CNC milling handles 2D and 2.5D profiles with a tolerance of ±0.01mm and supports diameters up to Ø800mm. 5-axis CNC milling offers full simultaneous linkage, tighter tolerances of ±0.005mm, a superior surface finish of Ra 0.2µm, and reduces setup time by 60%—making it ideal for the complex spiral flute geometry of conical burrs.
Q
How do you ensure the dimensional accuracy of each conical burr?
We implement a rigorous 9-step quality inspection process covering DFM analysis, dimensional tolerance checks, first part inspection, in-process machining control, FQC detection, material reporting, surface treatment verification, packaging inspection, and a final summary of issues. This comprehensive process delivers 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 manufacturing ensures consistent performance across all grinder types and applications.
Q
What tolerances can you achieve during the manufacturing of conical burrs?
Using our advanced multi-axis CNC milling technology, we achieve extreme tolerances ranging from ±0.005mm to ±0.01mm. Our 5-axis CNC milling centers can deliver a surface finish as fine as Ra 0.2µm, ensuring flawless cutting edge geometry and perfectly consistent grind particle size.
Q
Can you produce custom conical burr designs or sizes?
Yes. Our manufacturing capability supports custom conical burr development. With precision CNC turning and simultaneous 5-axis CNC milling, we can machine complex custom geometries and spiral flute profiles to meet your specific design requirements. Please contact us with your specifications for a detailed consultation.
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