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China Suppliers Factory for Custom CNC Metal Machining Stainless Steel SS420 Conical Burrs 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.
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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1High-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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2Multi-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 including 9Mn2V and 90MnCrV8. These materials are selected for their exceptional hardness, long-lasting sharpness, and outstanding wear resistance, ensuring safe and reliable daily use in coffee grinding applications.
Q
What machining tolerance can you achieve on conical burrs?
Using our advanced 5-Axis CNC milling centers, we achieve tolerances as tight as ±0.005mm on the cutting flute geometry. Our 3-Axis CNC milling operations maintain a tolerance of ±0.01mm. These precision levels ensure consistent grind particle size and superior coffee extraction performance.
Q
What types of grinders are your conical burrs compatible with?
Our conical burrs are designed for use in both high-end manual hand grinders and commercial electric coffee grinders. We can manufacture burrs to custom specifications, including various outer diameters and cutting flute geometries, to suit your specific grinder model and performance requirements.
Q
How do you ensure quality consistency across production batches?
We implement a rigorous 9-step quality inspection process covering DFM analysis, dimensional tolerance verification, first-part inspection, in-process machining checks, FQC detection, material certification reports, surface treatment evaluation, packaging inspection, and a comprehensive summary of issues review. This system delivers a product pass rate of up to 99%.
Q
Can you manufacture conical burrs to custom designs or OEM specifications?
Yes. We support full OEM and custom manufacturing. Our engineering team can work from your technical drawings, CAD files, or sample burrs. With our 5-Axis CNC capability, we can replicate complex spiral flute geometries and tailor material selection, surface finish, and dimensional specifications to match your exact product requirements.
Q
What surface finish options are available for conical burrs?
Our 5-Axis CNC milling process achieves a surface finish of Ra 0.2µm as standard. We also offer additional surface treatment options to enhance corrosion resistance, reduce friction, or meet specific food-safety or aesthetic requirements. Please contact our team to discuss the most suitable surface treatment for your application.
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