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Busch Burr 77A Pearl Drill 2.90mm – a top choice for professional jewelers, delivers unmatched precision and quality to prevent chipping and produce smooth, soft-edged holes in delicate materials such as pearls, coral, and ivory. Founded in 1905, Busch has established itself as a world leader in high-precision rotary tools, renowned for manufacturing durable, high-quality burs specifically engineered for accuracy and reliability in fine jewelry making and repair.
These Busch® Burs Pearl Drills feature a unique smooth flat head design and a 2.90mm diameter, expertly crafted from strong hardened tungsten vanadium steel. This ensures clean, flawless holes that preserve the integrity of the nacre and other sensitive materials. Each bur has a 4.2mm working head depth, optimized to deliver consistent, controlled results whether drilling fresh holes or enlarging pre-existing ones.
Compatible with a wide range of rotary tools including pendant drills, micromotors, flex shafts, and pin vices, these burs provide jewelers with enhanced control and precision during intricate drilling tasks.
For optimal performance and to safeguard the delicate surface of pearls, it is recommended to secure the pearl in a specialized pearl vice or hold it carefully with fingers wrapped in protective tape. Drilling should be performed underwater or with coolant to prevent overheating and discoloration, preserving the natural beauty of the gem.
Crafted for long-lasting durability and high performance, Busch® Burs are essential in any jeweler’s toolkit, delivering smooth finishes and fine detailing effortlessly. Their precision engineering makes them the preferred choice for artisans focused on excellence in jewelry craftsmanship.
- Brand: Busch®
- Type: Pearl Drill Bur
- Model: 77A Pearl Drill
- ISO Number: #029
- Shank Diameter: 3/32" (2.34mm tapered)
- Size: 2.90mm diameter, 4.2mm working head depth
- Shank: 2.34mm tapered, compatible with various drill collets
- Material: High-quality hardened tungsten vanadium steel
- Application: Jewelry making, pearl drilling, delicate material drilling
About this Item:
Busch® burs are precision-engineered from premium tungsten vanadium steel, ensuring exceptional hardness, durability, and long-lasting sharpness. Their fine, uniformly spaced teeth provide smooth, consistent cuts that minimize the risk of chipping or cracking delicate materials such as pearls, coral, ivory, and other organic gemstones. Ideal for both new hole drilling and enlarging existing holes, these burs offer superior control and accuracy, especially at low rotary speeds preferred in jewelry applications.
How to Use:
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Secure the bur firmly into a rotary tool such as a flex shaft, pendant drill, micromotor, or Dremel.
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Hold the pearl or fragile item securely in a pearl vise or protect your fingers by wrapping them in soft tape.
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Drill carefully under water or with coolant to avoid overheating and discoloration.
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Apply gentle, steady pressure to allow the bur to cut cleanly without forcing it.
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Use a lubricant such as Busch Lube-Stik or light mineral oil to extend the tool’s service life and maintain sharpness.
Safety Information:
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Always wear protective eyewear to protect eyes from debris during drilling.
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Avoid excessive speeds to prevent bur damage and material overheating.
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Clean burs after use with a soft cloth and mild soap, or an ultrasonic cleaner if available, to remove debris and maintain cutting efficiency.
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Store burs in a dry, organized container to preserve sharpness and prevent damage.
Additional Features:
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Tapered 2.34mm shank ensures a secure fit in most standard rotary tool collets for stable operation.
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Smooth flat-head design reduces stress on fragile surfaces, helping prevent cracking or chipping.
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Designed for minimal vibration and smooth operation to improve comfort and control during extended use.
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Manufactured under strict quality standards in Germany to guarantee precision and reliability.
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Suitable for professional jewelers, gem setters, and artisans who demand consistent, high-quality results.
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Ideal for creating precise, clean holes in pearls, coral, ivory, and other delicate organic materials without compromising their integrity or appearance.
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Features
2.90mm Precision Drill: Designed to prevent chipping and create clean, smooth, soft-edged holes in pearls, coral, ivory, and other delicate materials, ensuring flawless craftsmanship.
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High-Quality Hardened Tungsten Vanadium Steel: Provides superior strength and durability, maintaining sharpness for extended use and resisting wear and corrosion.
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4.2mm Working Head Depth: Offers precise control for consistent drilling depth, whether creating new holes or enlarging existing ones with accuracy.
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Versatile Compatibility: Fits a variety of rotary tools such as pendant drills, micromotors, pin vices, flexible shafts, and Dremel handpieces for flexible use in multiple jewelry applications.
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Professional Grade Quality: Widely trusted by jewelers and artisans worldwide for exceptional accuracy, smooth cutting action, and reliable performance on delicate materials.
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Low Vibration and Heat Generation: Engineered to minimize vibration and heat buildup during low-speed drilling, protecting sensitive materials from damage or discoloration.
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Smooth Flat-Head Design: Reduces stress on fragile surfaces, preventing cracks, chips, and damage to pearls and organic gemstones.
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Optimized for Low-Speed Operation: Performs best at low RPMs, ideal for delicate jewelry work and preventing overheating of sensitive materials.
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Precision Tapered Shank (2.34mm): Ensures a secure and stable fit in most professional rotary tool collets, providing maximum control and accuracy.
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Easy to Maintain: Designed with smooth surfaces and premium materials for straightforward cleaning and upkeep, helping preserve cutting efficiency and tool lifespan.
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Ideal for Fine Jewelry and Delicate Drilling: Perfect for drilling pearls, coral, ivory, and other fragile organic materials without compromising their natural beauty or structural integrity.
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