Grewin Golden Bull-B Rotary File
Grewin Golden Bull – Type F Rotary Burr · Professional Torch-Shaped Tool
The Grewin Golden Bull Type F rotary burr, with its torch/elliptical design, is one of the most distinctive and highly specialized models in the rotary burr family. It offers unique advantages in machining smooth S-shaped curves, complex organic forms, and performing multiple contour operations with a single tool. It is the professional choice for mold making, jewelry, precision machining, and medical device manufacturing.
Key Features:
- Tungsten Carbide Material: Extremely hard, wear- and heat-resistant, long tool life, capable of high-speed cutting of a wide range of hard materials.
- Wide Application Range: Suitable for metals with hardness ≤ HRC55 (carbon steel, alloy steel, stainless steel, etc.).
- Double-Cut Spindle Shape: Spindle-shaped cutting head with cross-cut flutes, delivering outstanding performance in machining complex curved surfaces and creating smooth transitions.
- Professional Performance: Highly flexible and versatile, ideal for complex 3D modeling, special contour machining, and artistic engraving.
- Premium Qualities: Sharp edges, burr-free finishing, wear- and heat-resistance; supports non-standard customization.
Usage & Maintenance:
- Safety: Always wear safety goggles and cut-resistant gloves to prevent injury from flying debris.
- Regular Cleaning: Remove chips and debris regularly to maintain cutting performance.
- Moderate Pressure: Avoid excessive force to prevent overheating and premature wear; reduce RPM when using extended tools.
- Speed Control: Designed for high-speed operation; adjust RPM according to material and use coolant when necessary.
Application Case | Improved Efficiency in Aerospace Component Repair
- Customer Background: An aerospace maintenance facility needed to deburr turbine blades made of nickel-based alloys. Conventional rotary burrs wore out quickly and required frequent replacement.
- Optimization: Recommended ultra-fine grain carbide K-series tapered rotary burr with coating, running at 25,000 RPM with minimal lubrication cooling.
- Customer Feedback: Tool life extended by 3×. A single burr could process 50 blades, achieving a surface finish of Ra0.8μm—eliminating the need for additional polishing.
