CMT 309.070.12 Dowel Drill - 7 x 43 x 70mm Left-Hand Rotation is a precision-engineered left-hand (LH) boring tool from CMT, purpose-built for high-volume panel drilling operations in furniture manufacturing, cabinet making, and joinery. Designed for use in multi-spindle CNC boring machines and panel processing centers, this 7mm diameter dowel drill delivers clean, flat-bottom blind holes in chipboard, MDF, hardwood, softwood, plywood, and coated laminates. The long-series 70mm overall length accommodates thicker panel stock where deeper blind holes are required, making it a reliable choice for dowel joinery in demanding production environments.

Key Features

• HW (Tungsten Carbide) Cutting Head with Precision-Balanced Centre Point - the carbide construction maintains a sharp, consistent cutting edge through high-volume boring cycles, reducing downtime and tool changes in production settings.
• 2 Precision-Ground HW Cutting Edges (Z2) - dual carbide cutting edges provide balanced cutting forces and smooth bore walls, resulting in tight-tolerance holes ideal for dowel connections.
• 2 Negatively Ground Spurs (V2) - negatively ground spur geometry scores the panel surface cleanly before the main cutters engage, virtually eliminating tearout and chipping on veneered, laminated, and coated panels.
• 4 Spiral Flutes - four flutes efficiently evacuate chips and dust from the bore during cutting, keeping the hole clean and reducing heat buildup that could cause burning or glue adhesion.
• PTFE-Coated Cutter Portion (Black or Orange) - the non-stick PTFE coating on the spiral prevents pitch and glue buildup, extending tool life and maintaining cutting performance between sharpenings.
• Super-Strength Steel Body - the steel shank and body resist deflection and vibration under the load of multi-spindle operations, contributing to consistent hole placement and repeatability.
• 10 x 20mm Parallel Shank with Driving Flat and Length Adjusting Screw - the standardized parallel shank with driving flat ensures secure seating and positive drive in compatible boring machine chucks, while the length adjusting screw allows precise depth setting without additional tooling.
• Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions in multi-spindle boring machines, ensuring correct chip evacuation direction and clean hole geometry on LH stations.
• Long-Series 70mm Overall Length - the extended length versus standard-series drills allows the tool to reach the required depth in thicker panels, expanding the range of panel stock the drill can accommodate.

Why This Product

• The negatively ground spur geometry combined with the HW cutting head makes this drill a strong choice for panels with delicate surface finishes - veneer, laminate, and coated faces emerge cleanly without the chipping that damages finished goods in furniture production.
• The 70mm long-series length fills the gap when standard-series dowel drills are too short for thicker panel stock, giving panel processors a single tool that handles a wider range of board thicknesses without adapter changes.
• Left-hand rotation is specifically required for the LH spindle positions in multi-spindle CNC boring machines - using the correct rotation direction is critical for proper chip flow and prevents hole wall damage that occurs when the wrong rotation is fitted.
• The PTFE coating on the cutter portion actively resists pitch and adhesive buildup during repeated boring cycles in glue-intensive assembly workflows, keeping the flutes clear and maintaining consistent cutting performance between scheduled maintenance intervals.

Specifications

• Manufacturer Part Number: 309.070.12
• Brand: CMT Orange Tools
• Diameter: 7mm
• 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
• Sharpening: Negatively ground spurs
• Number of Flutes: 4
• Blade Material: HW (Tungsten Carbide)

Approved Applications

• Drilling blind holes for dowel connections in panel furniture and cabinet assembly
• Panel drilling on multi-spindle CNC boring machines - left-hand spindle positions
• Furniture manufacturing and high-volume cabinet making production lines
• Boring operations in solid wood, chipboard, MDF, HDF, plywood, laminates, and coated panels
• Deep blind-hole drilling in thicker panel stock requiring the extended 70mm long-series length