Product Description
The CMT 306.060.12 Dowel Drill 6 x 30 x 55.5mm Left-Hand by CMT is a precision-engineered boring tool built for high-speed CNC dowel hole production in solid wood, chipboard, MDF, and laminates. Featuring an HW (carbide) cutting head with 2 precision-ground cutting edges and 2 negatively ground spurs, this left-hand rotation drill delivers clean, flat-bottom blind holes with minimal tear-out - making it a reliable choice for furniture manufacturing, cabinet making, and panel processing applications.
Key Features
- HW (Carbide) Head with Precision Balanced Centre Point - the super-strength steel body paired with a carbide cutting head provides exceptional wear resistance, keeping the drill centered and accurate even at high CNC production speeds.
- 2 Precision-Ground HW Cutting Edges (Z2) - dual carbide cutting edges produce consistently clean bore walls and flat-bottom holes, reducing the need for secondary finishing in dowel joint assembly.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur geometry scores the material perimeter before the main cutting edges engage, preventing surface splintering and chipping on coated panels and laminates.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle CNC boring machines, ensuring correct cutting geometry and chip evacuation for the intended spindle orientation.
- 8 x 20mm Shank - the parallel shank with driving flat provides a secure, slip-resistant fit in compatible CNC boring chucks and adapters, maintaining positional accuracy during high-cycle production runs.
- 30mm Cutting Height - provides sufficient depth capacity for standard dowel blind holes without unnecessary tool overhang, supporting rigidity and bore-to-bore consistency across large panel batches.
Why This Product
- Left-hand spindle positions on multi-spindle boring heads require a purpose-built LH drill - this tool is engineered specifically for that orientation, so cutting geometry, chip flow, and spur action all work correctly rather than fighting the spindle direction.
- The negatively ground spur design addresses one of the most common CNC boring problems - surface tear-out on melamine, laminate, and coated chipboard - by scribing a clean perimeter line before the cutting edges remove material.
- With an HW (carbide) cutting head on a super-strength steel body, this drill is built to withstand the high-cycle demands of panel processing centers and multi-spindle boring machines where tool life directly affects production throughput.
- The 6mm diameter and 55.5mm total length place this drill in the standard short-series category most commonly required for furniture and cabinet dowel connections, reducing the need for custom tooling or adapter setups.
Specifications
- Manufacturer Part Number: 306.060.12
- Brand: CMT Orange Tools
- Description: Dowel Drill 6 x 30 x 55.5mm LH
- Diameter: 6mm
- Cutting Height: 30mm
- Total Length: 55.5mm
- Shank: 8 x 20mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Sharpening: Negatively ground spurs
- Blade Material: HW (Carbide)
Approved Applications
- Blind hole drilling for dowel connections in solid wood
- Chipboard and particleboard panel boring
- MDF and HDF drilling for furniture assembly
- Laminate and coated panel boring on CNC equipment
- Cabinet making and furniture manufacturing production lines
- High-speed panel processing on multi-spindle CNC boring machines
Frequently Asked Questions
Why does this drill have left-hand (LH) rotation, and how do I know if I need it?
Left-hand rotation drills are required for left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers. These machines have spindles that rotate in opposite directions depending on their position in the boring head array. If your machine's spindle turns counterclockwise when viewed from the cutting end, you need an LH drill like this one. Using an RH drill on an LH spindle would cause the tool to unscrew from the chuck and produce incorrect hole geometry.
What does "negatively ground spurs" mean and why does it matter for my material?
Negatively ground spurs are angled to scribe the outer perimeter of the hole before the main cutting edges remove the core material. This scribing action severs the surface fibers cleanly before they can tear, which is especially important when drilling chipboard, MDF, melamine-coated panels, and laminates where surface blow-out is a common problem. The result is a cleaner bore entry with less visible splintering or chipping around the hole opening.
What shank size does this dowel drill use, and what does the driving flat do?
This drill uses an 8 x 20mm parallel shank. The driving flat is a machined flat surface on the shank that seats against a corresponding flat or set screw in the boring chuck or adapter. It prevents the tool from rotating or slipping under the torque loads generated during high-speed CNC boring, maintaining consistent hole position and depth across repeated cycles.
Can this drill be resharpened, and what edges are resharpened?
Yes. The HW (carbide) cutting head with precision-ground cutting edges (Z2) and negatively ground spurs (V2) is designed to allow resharpening. The carbide material is selected for its hardness and wear resistance, which means the edges hold their geometry through many production cycles before regrinding is needed, supporting lower long-term tooling costs in high-volume boring operations.
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