Grewin Jin Niu J-Type Rotary Burr — The Preferred Tool for Finishing and Polishing
Product Overview
The Grewin Jin Niu J-type rotary burr adopts a single-spiral cutting edge design, where the cutting teeth are formed by one continuous helical line, resulting in a uniform spiral pattern.
Compared with double-cut burrs, the J-type removes material at a lower rate, but this makes it particularly suitable for the finishing stage, ensuring precise dimensional control and avoiding over-cutting.
When smooth surfaces, fine finishing, or soft metal machining are required, the J-type single-cut rotary burr is the ideal choice.
Features
- Carbide material: premium, extremely hard and wear-resistant, capable of maintaining sharp edges for long periods.
- Dimensional stability: ensures accuracy and consistency during fine finishing.
- Single-cut design: delivers smooth cutting with minimal vibration.
- Excellent adaptability: the small tapered head can access narrow corners, making it ideal for chamfering, taper machining, and sloped surfaces.
Suitable Materials
- Metals with hardness ≤ HRC40 (e.g., cast iron, low-hardness carbon steel).
- Ideal for final finishing, surface quality improvement, and soft metal machining.
Application Fields
- Mold industry
- Precision mechanical processing
- Medical device manufacturing
- Aerospace
Technical Specifications
- Manufactured according to ISO 7755-1984(E)
- Available in 12 models and 78 specifications of carbide rotary burrs
- Supports OEM, sample trial production, and non-standard customization
Operation & Maintenance
- Safety: wear protective goggles and cut-resistant gloves to prevent flying chips.
- Regular cleaning: remove chip residues to maintain optimal cutting performance.
- Proper force: avoid excessive pressure that may cause overheating or premature wear (reduce speed for extended tools).
- Speed control: designed for high-speed operation; follow recommended speeds and adjust depending on material.
Case Study — Root Cleaning and Taper Slot Machining in Mold Cavities
In mold cavities or precision parts, deep and narrow slots often require root cleaning or taper machining.
Using the J-type single-cut rotary burr, the tapered sides fit closely against slot walls for milling, while the sharp head penetrates narrow bottoms to clean residues. When taper slots are required, its natural conical shape is especially suitable.
This enabled efficient root cleaning and precise taper slot machining, tasks that are difficult to achieve with conventional cylindrical burrs.
