Product Description
CMT 310.090.12 Dowel Drill 9 x 27 x 57.5mm LH by CMT is a precision-engineered, left-hand rotation dowel boring bit built for high-volume panel processing and furniture manufacturing. With a 9mm diameter carbide-tipped (HW) cutting head, 2-flute spiral design, and PTFE-coated body, this short-series dowel drill delivers clean, flat-bottom blind holes in chipboard, MDF, hardwood, plywood, and coated panels - exactly the performance demanded by CNC boring centers and multi-spindle boring machines.
Key Features
- 2 HW (Tungsten Carbide) Precision-Ground Cutting Edges (Z2) - hardwearing carbide tips hold a sharp edge longer than standard steel, maintaining consistent hole quality across high-volume production runs without frequent resharpening stops.
- 2 Negatively Ground Spurs (V2) - slicing the wood fibers cleanly ahead of the main cutting edge, these precision spurs eliminate tearout and produce smooth, crisp bore walls even in veneered or laminated panels.
- 2 Spiral Flutes - efficiently evacuate chips and sawdust from the blind hole during drilling, reducing heat buildup and preventing clogging that could otherwise cause burning or oversized bores.
- PTFE-Coated Spiral Portion (Orange or Black) - the low-friction PTFE coating prevents pitch, resin, and adhesive buildup on the tool body, extending service life and keeping each hole dimension accurate over time.
- Left-Hand (LH) Rotation - purpose-built for left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers, ensuring correct cutting direction and optimal surface finish on the workpiece.
- Parallel Shank 10 x 27mm with Driving Flat and Length Adjusting Screw - the driving flat provides positive torque transfer without slipping, while the length adjusting screw allows precise depth setting directly in the machine spindle.
- Super-Strength Steel Body - the premium steel construction withstands the vibration and repetitive cycling of industrial boring centers without deflection, preserving hole-position accuracy across large panel batches.
Why This Product
- The 9mm diameter paired with a 27mm cutting height and compact 57.5mm overall length fits standard short-series boring spindle configurations, making this bit a direct-fit replacement for multi-spindle CNC and panel boring equipment without adapter modifications.
- The combination of negatively ground spurs and carbide cutting edges means both the perimeter score and the main bore are executed in a single plunge - producing flat-bottom, clean-wall dowel holes in chipboard, MDF, hardwood, and laminates without secondary cleanup.
- PTFE coating on the spiral actively repels pitch and adhesive residue common in composite panel materials, reducing downtime spent cleaning bits and helping maintain consistent hole tolerance across long production shifts.
- Left-hand rotation is not interchangeable with right-hand bits - having the correct LH version means the cutting geometry works with spindle direction rather than against it, protecting both the tool and the workpiece surface finish.
Specifications
- Manufacturer Part Number: 310.090.12
- Brand: CMT Orange Tools
- Diameter: 9mm
- Cutting Height: 27mm
- Total Length: 57.5mm
- Shank: 10 x 27mm (parallel shank with driving flat and length adjusting screw)
- Number of Flutes: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Number of Teeth: 2
- Blade Material: HW (Tungsten Carbide)
- Rotation: LH (Left-Hand)
- Coating: PTFE (orange or black) on spiral portion
Approved Applications
- Drilling blind holes for dowel joinery connections
- Panel drilling in furniture manufacturing and cabinet making
- Boring in solid hardwood and softwood
- Drilling chipboard, MDF, and HDF sheet goods
- Processing plywood, coated panels, and laminates
- Plastic panel boring
- Multi-spindle CNC boring machine operations
- CNC boring center and panel processing center applications
Frequently Asked Questions
Why does this dowel drill have left-hand (LH) rotation - can it be used on a standard right-hand spindle?
No. This bit is specifically designed for left-hand spindle positions on multi-spindle boring machines and CNC panel processing centers. Using a left-hand bit on a right-hand spindle reverses the cutting geometry, causing the spurs and edges to rub rather than cut, which damages both the tool and the workpiece surface. Always match bit rotation to spindle direction.
What does the PTFE coating on the spiral do, and does it affect cutting performance?
The PTFE coating is applied to the spiral flute area of the tool body - not the cutting edges themselves. Its purpose is to reduce friction so that pitch, resin, and adhesive residue from composite materials like chipboard, MDF, and laminates do not bond to the tool. This keeps the flutes clear for efficient chip evacuation and helps the bit maintain accurate hole dimensions over extended use. Cutting performance at the carbide edges is not reduced by the coating.
What is the function of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs score the perimeter of the hole before the main carbide cutting edges remove the core material. This pre-scoring action severs wood fibers cleanly at the bore wall, preventing the splintering and tearout that commonly occurs when drilling coated panels, veneered chipboard, or laminates - materials where a clean, chip-free entry and bore wall are critical to a quality dowel joint.
What shank size and machine interface does this dowel drill require?
This drill uses a 10 x 27mm parallel shank with a driving flat and a length adjusting screw. The driving flat ensures positive rotational engagement in the machine spindle without slipping under load, and the length adjusting screw allows the operator to set precise drilling depth directly from the tool body. This interface is standard on multi-spindle CNC boring centers and panel boring machines designed for short-series dowel drills.
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