Product Description
CMT 311.140.12 Dowel Drill 14 x 35 x 70mm Left-Hand by CMT is a precision-engineered, left-hand rotation boring bit designed for clean, accurate blind-hole drilling in panel processing and furniture manufacturing applications. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 14mm diameter drill features 2 precision-ground cutting edges, 2 negatively ground spurs, and a PTFE-coated spiral that resists pitch and adhesive buildup during production boring. Whether you are producing dowel joints in chipboard, MDF, hardwood, or laminated panels, this long-series dowel drill delivers flat-bottomed holes with minimal tearout on every pass.
Key Features
- Tungsten carbide (HW) cutting head - provides superior hardness and edge retention compared to standard high-speed steel, extending service life in demanding panel boring applications.
- 2 precision-ground cutting edges - deliver consistent bore diameter and a clean, flat hole bottom that ensures tight, reliable dowel joint assembly.
- 2 negatively ground spurs - score the panel surface cleanly before the main cutting edges engage, eliminating chip-out and surface tearout on chipboard, MDF, and laminates.
- PTFE-coated spiral flutes - reduce friction and prevent pitch, resin, and glue from adhering to the tool body, keeping the drill running freely and extending time between cleaning cycles.
- Left-hand (LH) rotation - engineered specifically for left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers, ensuring the cutting geometry works with the correct spindle direction.
- Parallel shank with driving flat and length-adjusting screw - allows precise axial positioning in the boring head and secure, slip-free chuck engagement during high-speed production runs.
- Long-series 70mm overall length with 35mm cutting height - accommodates deeper blind-hole boring requirements in thicker panel stock without sacrificing rigidity or hole accuracy.
- 10 x 30mm shank - matches the standard tooling bore of most multi-spindle industrial boring heads, making this a direct-fit replacement in common machine configurations.
Why This Product
- The combination of 2 negatively ground spurs and a carbide cutting head makes this drill a dependable choice for production cabinet making and furniture manufacturing where clean hole walls and zero tearout on coated or laminated surfaces are non-negotiable.
- Left-hand rotation is a hard engineering requirement for left-side spindles on multi-spindle boring machines - using a right-hand drill in that position causes the cutting edges to rub rather than cut, making this LH-specific geometry essential rather than optional.
- The PTFE-coated flutes address a real production problem: pitch and adhesive residue from MDF binders and coated panels can load flutes quickly, causing heat buildup and bore drift - the non-stick coating keeps chips evacuating freely between tool changes.
- With a 35mm cutting height on a 70mm long-series body, this drill reaches the boring depth required for standard furniture dowel connections while the rigid 10 x 30mm parallel shank maintains concentricity and minimizes runout at the hole wall.
Specifications
- Manufacturer Part Number: 311.140.12
- Brand: CMT Orange Tools
- Diameter: 14mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 30mm parallel shank with driving flat and length adjusting screw
- Rotation: Left-Hand (LH)
- Number of Flutes: 2
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
- Spiral Coating: PTFE (orange or black)
- Product Series: Long Series
Approved Applications
- Blind hole drilling for dowel connections and furniture joinery
- Panel boring on multi-spindle CNC boring machines
- Cabinet making and case goods production
- Furniture manufacturing and flat-pack component boring
- Boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
Frequently Asked Questions
Why does this drill have left-hand (LH) rotation and when do I need it?
Multi-spindle CNC boring machines and panel processing centers have spindles that rotate in opposite directions depending on their position in the boring head. Left-hand spindles require a left-hand drill so the cutting edges rotate into the material correctly. Using a right-hand drill on a left-hand spindle causes the tool to rub rather than cut, producing oversized, rough holes and rapid tool wear. The CMT 311.140.12 is designed specifically for those left-hand spindle positions.
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs on the outer circumference of the drill score the panel surface ahead of the main cutting edges. This scribing action severs the surface fibers cleanly before the body of the drill removes material, preventing chip-out and delamination on chipboard, MDF, laminates, and coated panels - materials where surface quality at the hole rim is critical for a clean furniture joint.
What does the PTFE coating on the spiral flutes do in practical use?
The PTFE (polytetrafluoroethylene) coating applied to the spiral portion of the drill creates a low-friction, non-stick surface on the flutes. During boring in MDF, chipboard, and adhesive-coated panels, pitch, binders, and glue residue can pack into uncoated flutes, increasing cutting temperature and causing bore diameter drift. The PTFE coating allows chips and debris to evacuate freely, reducing heat buildup and keeping the drill performing consistently over longer production runs.
What shank size and machine interface does this drill use?
The CMT 311.140.12 uses a 10 x 30mm parallel shank with a driving flat and a length-adjusting screw. This is a standard shank configuration for industrial multi-spindle boring heads and CNC boring centers. The driving flat prevents rotational slippage under load, and the length-adjusting screw allows precise axial depth setting within the boring head to control the exact boring depth at the spindle.
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