Product Description
CMT Two Flute Dowel Drill - 7 x 44 x 77mm Left-Hand Rotation is a precision-engineered boring tool built for clean, flat-bottom blind holes in furniture panels, cabinetry components, and solid wood assemblies. Designed for left-hand (LH) rotation spindles, this 7mm diameter drill delivers the accuracy and consistency demanded by professional woodworking shops running multi-spindle CNC boring machines and panel processing centers. The tungsten carbide (HW) cutting head, combined with a negatively ground spur geometry, produces crisp bore walls with minimal tearout - making it a reliable choice for dowel joinery in chipboard, MDF, hardwood, and coated panels alike.
Key Features
- Tungsten Carbide (HW) Cutting Head with Precision Balanced Centre Point - the carbide tipped construction maintains edge sharpness through high-volume production runs, reducing downtime and regrind frequency compared to standard steel tooling.
- 2 Precision Ground Cutting Edges (Z2) - dual flute geometry promotes efficient chip evacuation and balanced cutting forces, resulting in smoother bore surfaces and reduced vibration during operation.
- 2 Negatively Ground Spurs (V2) - the negatively ground spur configuration scores the wood fibers ahead of the cutting edges, preventing splintering and delivering clean hole entrances even in laminates and coated panels.
- PTFE Non-Stick Coating on Cutter Portion - the orange or black PTFE coating on the spiral resists pitch and adhesive buildup, extending tool life and maintaining consistent performance when drilling glued or coated workpieces.
- Super-Strength Steel Body - the high-strength steel shank and body absorb the stresses of repetitive production drilling, providing durability and resistance to deflection for accurate hole placement.
- Parallel Shank (10 x 30mm) with Driving Flat and Length Adjusting Screw - the driving flat prevents shank slippage under torque, and the length adjusting screw allows precise depth setting in multi-spindle boring heads and CNC chucks without additional tooling.
- Left-Hand (LH) Rotation - engineered specifically for left-hand spindles found on dual-sided CNC boring machines, ensuring correct chip clearance direction and proper engagement of the cutting geometry.
- 44mm Cutting Height - the extended cutting length accommodates deep blind hole drilling in thick panels, supporting dowel connections in heavy-duty furniture and cabinet construction.
Why This Product
- Purpose-built for left-hand spindle positions on multi-spindle boring machines - using a right-hand drill on an LH spindle would produce incorrect geometry and poor hole quality, making this the correct tool for that application.
- The combination of a carbide cutting head, negatively ground spurs, and PTFE-coated spiral addresses the three most common dowel drilling problems at once: edge tearout, pitch buildup, and premature wear - in a single tool.
- With a 44mm cutting height on a 77mm overall length body, this drill handles deep blind hole work in thick panel stock where shorter series drills cannot reach the required depth for standard dowel connections.
- The parallel shank with driving flat and length adjusting screw makes this drill straightforward to set up and lock securely in boring machine chucks and adapters, reducing setup time between production runs.
Specifications
- Manufacturer Part Number: 362.070.12
- Diameter: 7mm
- Cutting Height: 44mm
- Total Length: 77mm
- Shank: 10 x 30mm parallel shank with driving flat and length adjusting screw
- Number of Flutes: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Cutter Coating: Orange or black PTFE
- Rotation: Left-hand (LH)
- Brand: CMT Orange Tools
Approved Applications
- Blind hole drilling for dowel connections in panel furniture
- Cabinet making and case goods manufacturing
- Panel drilling on CNC boring centers and multi-spindle boring machines
- Drilling in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Deep blind hole work in thick panels where standard-length drills cannot achieve required depth
Frequently Asked Questions
What does left-hand (LH) rotation mean, and why does it matter when selecting this drill?
Left-hand rotation means the drill is designed to spin counter-clockwise when viewed from the shank end. Multi-spindle CNC boring machines and boring centers commonly have both right-hand and left-hand spindles positioned across the head. Using the correct rotation drill for each spindle ensures the cutting edges and spurs engage the material properly, producing clean flat-bottom holes and correct chip evacuation. Installing a right-hand drill on a left-hand spindle would cause the tool to rub rather than cut, damaging both the workpiece and the tool.
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs (V2) score around the perimeter of the hole before the main cutting edges remove the material. This pre-scoring action severs wood fibers and surface coatings cleanly at the hole boundary, which is particularly important when drilling laminates, coated panels, and veneered chipboard where tearout at the entry point would be visible in the finished product. The result is a clean, splinter-free hole entrance suited to furniture-grade work.
What does the PTFE coating on the cutter portion do during production drilling?
The orange or black PTFE coating applied to the spiral portion of the cutter acts as a non-stick surface that resists the accumulation of pitch, resin, and adhesive residue that builds up during high-volume drilling. Pitch and glue deposits on an uncoated tool increase friction, generate heat, and reduce cutting efficiency. By minimizing buildup, the PTFE coating helps maintain consistent hole quality across longer production runs and extends the interval between cleaning or resharpening.
What machines are compatible with this dowel drill, and how is the shank secured?
This drill is designed for use in multi-spindle CNC boring machines, CNC boring centers, and panel processing centers that accept a 10 x 30mm parallel shank. The driving flat on the shank provides a positive engagement surface that prevents rotation under torque, and the length adjusting screw allows the drill to be set to a precise projection depth within the boring head or chuck adapter. This combination supports accurate, repeatable depth control across all spindle positions in a production environment.
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