The Diamond Coated Needle Drill Bits are precision tools designed for drilling delicate holes in hard materials such as agate, jade, ball beads, barrel beads, and other gemstones. Perfect for creating jewelry components like necklaces, earrings, pendants, and bracelets, these bits ensure clean, precise perforations with minimal material stress.
Key Features:
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Ultra-Fine Drilling: Ideal for punching holes in brittle stones (agate, jade) and beads without cracking.
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Diamond-Coated Tip: Electroplated diamond grit ensures sharpness and durability for repeated use.
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Universal Compatibility: 3/32″ shank fits high-speed drilling machines and rotary tools like Foredom or Dremel.
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User-Friendly Design: Pre-cut with pliers for optimal sharpness; refresh edges on a grinding wheel if needed.
Technical Specifications:
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Shank Size: 3/32″ diameter, compatible with standard collets.
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Material: Steel mandrel with electroplated diamond coating.
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Applications: Drilling, punching, and precision hole creation in gemstones, ceramics, and metals.
Usage Instructions:
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Preparation: Trim the tip slightly with pliers before first use to ensure sharpness.
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Positioning: Secure the bead and mark hole locations on both sides. Drill halfway from each side to prevent blowout.
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Machine Settings: Use a high-speed drilling machine (5,000+ RPM) with waterproof cooling to reduce heat.
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Technique: Apply light pressure and frequently advance/retreat the bit to clear debris and avoid breakage.
Ideal For:
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Creating holes in cabochons or bead strands for jewelry assembly.
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Pairing with polishing compounds for finishing drilled edges.
Precautions:
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Speed & Cooling: Maintain speeds above 5,000 RPM and use a water swivel adaptor for cooling.
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Pressure: Avoid excessive force—let the diamond grit do the work.
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Tool Care: Replace bits if tips dull; sharpen on a grinding wheel as needed.