Product Description
CMT 309.100.12 Dowel Drill 10 x 43 x 70mm LH by CMT is a precision-engineered left-hand rotation boring tool built for clean, flat-bottom blind holes in panel processing and furniture manufacturing applications. Designed for use in multi-spindle CNC boring machines and panel drilling centers, this 10mm carbide-tipped dowel drill delivers the accuracy and repeatability that cabinet makers and woodworking professionals depend on. The long-series 70mm overall length accommodates thicker panel stock where shorter drills fall short, making it a reliable choice for drilling dowel connection holes in chipboard, MDF, hardwood, plywood, and coated panels.
Key Features
- Hardmetal (HW) cutting head with precision balanced centre point - ensures the drill enters the workpiece on-centre every time, reducing wandering and producing consistently accurate hole placement across high-volume production runs.
- 2 precision-ground HW cutting edges (Z2) - tungsten carbide edges maintain sharpness far longer than high-speed steel, reducing downtime for tool changes and keeping bore quality consistent throughout the tool's service life.
- 2 negatively ground spurs (V2) - score the wood fibres cleanly before the cutting edges remove material, producing flat-bottom holes with clean, tear-out-free walls in solid wood, laminates, and coated panels alike.
- 4 spiral flutes - evacuate chips efficiently from the bore, preventing clogging and heat buildup that can scorch MDF or chipboard surfaces and degrade hole quality.
- PTFE-coated cutter portion - the black or orange P.T.F.E. coating resists pitch and adhesive buildup, keeping the flutes clear and the tool performing at full efficiency even in resin-rich or pre-glued materials.
- Super-strength steel body - provides the structural rigidity needed to withstand the high-cycle demands of automated panel processing without deflection or premature fatigue.
- Parallel shank with driving flat and length adjusting screw - allows secure, repeatable positioning in multi-spindle boring heads and CNC boring centers, ensuring consistent drilling depth across all spindle positions.
- Left-hand (LH) rotation - purpose-built for left-hand spindle positions on multi-spindle boring machines, ensuring correct engagement and proper chip ejection on LH-designated boring heads.
Why This Product
- The 70mm long-series length provides extra reach for drilling blind holes in thicker panel stock - applications where standard short-series dowel drills cannot achieve the required cutting depth without repositioning.
- The combination of negatively ground spurs and a precision-balanced HW centre point is specifically suited to sheet materials like MDF, chipboard, and laminate-faced panels, where clean entry and exit are critical to finished product quality.
- Left-hand rotation is a dedicated design feature - not an adapter workaround - meaning this drill is optimized for LH spindle positions and delivers balanced cutting performance without the compromises of reversed-rotation tooling conversions.
- The 10mm diameter and 43mm cutting height match common dowel connection standards used in flat-pack and cabinet furniture production, making this a direct-fit replacement or upgrade for production boring operations.
Specifications
- Manufacturer Part Number: 309.100.12
- Brand: CMT Orange Tools
- Diameter: 10mm
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm (parallel shank with driving flat and length adjusting screw)
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Number of Flutes: 4
- Blade Material: HW (Hardmetal / Carbide)
Approved Applications
- Drilling blind holes for dowel connections in furniture and cabinet assembly
- Panel drilling on multi-spindle CNC boring machines
- Boring operations on CNC boring centers and panel processing centers
- Use in boring machines with adapter or chuck (LH spindle positions)
- Chipboard and particleboard panel processing
- MDF and HDF drilling
- Solid hardwood and softwood boring
- Plywood, laminates, and coated panel drilling
- Flat-pack furniture manufacturing
- Cabinet making and case goods production
Frequently Asked Questions
What does left-hand (LH) rotation mean, and how do I know if this drill is right for my machine?
Left-hand rotation means the drill spins counter-clockwise when viewed from the shank end. Multi-spindle boring machines have designated LH and RH spindle positions depending on their layout. Check your machine's spindle specification sheet to confirm which positions require LH tooling before installing this drill.
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs score the wood fibres around the perimeter of the hole before the cutting edges remove material. This produces clean, tear-out-free bore walls and a flat bottom - particularly important when drilling chipboard, laminate-faced panels, or coated surfaces where surface quality directly affects the appearance and fit of the finished assembly.
Why does this drill have a PTFE coating on the cutter portion?
The black or orange P.T.F.E. coating on the cutter portion resists the buildup of pitch, resin, and adhesive residue that accumulates during high-cycle production boring. By preventing this buildup in the flutes, the coating helps maintain chip evacuation efficiency and cutting performance, extending the interval between cleaning and resharpening.
Can this dowel drill be resharpened, and what sharpening method is used?
Yes. The cutting geometry includes negatively ground spurs, which is the sharpening specification for this tool. Resharpening should be performed by a qualified carbide tooling sharpening service to preserve the precision-ground HW cutting edges and spur geometry that determine hole quality.
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