Reveal the "Zero Burr" Secret: Rigid Milling + Flexible Brushing Explained
How to achieve < 0.05mm root cleanliness without manual labor.
Why is it that no matter how sharp your carbide milling cutter is, it always leaves a tiny "flip" or "burr" at the exit point of the gear tooth?
This is physics. Metal has plasticity. [cite_start]When the cutter exits, the material yields instead of shearing cleanly[cite: 1]. To solve this, Armpre moved away from "Single Station" machines and pioneered the "Rigid + Flexible" Dual Station concept.
1. The Concept: "Rigid" vs. "Flexible"
A perfect chamfer requires two distinct physical actions:
- Rigid Milling (Station 1): Using solid carbide tools and 5-axis CNC linkage to remove 95% of the material. [cite_start]This defines the geometry (C-chamfer or R-chamfer)[cite: 3].
- Flexible Brushing (Station 2): Using a high-speed wire brush to attack the remaining 5%. [cite_start]The goal here is not to change the shape, but to "weaken" the root of the burr so it falls off[cite: 3].
"Do not rely on brushing alone to remove large burrs. Brushes are for finishing, not cutting. If you skip the milling step, your brush wear costs will skyrocket."
| Feature | Single Station (Milling Only) | Armpre Dual Station (Mill + Brush) |
|---|---|---|
| Secondary Burr | Present (0.1 - 0.2mm) | Eliminated (< 0.05mm) |
| Surface Roughness | Ra 3.2 | Ra 0.8 (Mirror Finish) |
| Consistency | Dependent on tool wear | Stable (CNC Compensated) |
[Data Source: Armpre Tech Center]
2. Smart Compensation: The "Brain" of the Brush
Brushes wear down over time. In old machines, operators had to manually adjust the brush position every few hours.
[cite_start]Armpre solved this with CNC Pressure Compensation. The system monitors the load on the brush motor. As the brush bristles shorten, the load decreases. The CNC system detects this and automatically feeds the brush axis forward by microns to maintain constant pressure[cite: 3].
Technology FAQ
Q1: How often do we need to change the brush?
Tony Says: With our auto-compensation system, a standard wire brush set can process 15,000 - 20,000 gears before needing replacement.
Q2: Can we use nylon brushes instead of wire?
Tony Says: Yes. For softer materials (aluminum/copper) or plastic gears, we swap the module to Diamond-impregnated Nylon brushes to prevent surface scratching.
Q3:Will the wire brush damage the gear tooth profile (Involute)?
Tony Says: No. The brush is "Flexible." It is set to interfere only by 0.2-0.3mm. It follows the path of least resistance—which is the sharp burr at the edge—without exerting enough pressure to grind away the hardened tooth face itself.
Q4: How do you handle the fine dust created by brushing?
Tony Says:This is a safety critical point. All Armpre Dual-Station machines come with an integrated Oil Mist Collector and magnetic separator. We capture 99% of the fine particles so they don't float in your factory air.
The Result: 100% Cleanliness
Don't let a $0.05 burr ruin your $500 gearbox. Upgrade to Dual Station technology today.
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