Product Description
CMT 309.075.12 Dowel Drill 7.5 x 43 x 70mm Left-Hand by CMT is a precision-engineered left-hand rotation boring tool designed for dowel hole drilling in furniture manufacturing, cabinet making, and panel processing applications. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 7.5mm diameter drill delivers clean, flat-bottom blind holes in chipboard, MDF, solid wood, and laminated panels. The 70mm overall length accommodates deeper panel stock, while the PTFE-coated cutter portion resists pitch and glue buildup for extended service life in production environments.
Key Features
- Super-strength steel body with HW (tungsten carbide) cutting head - provides the hardness and durability required for continuous boring in abrasive sheet materials like MDF, chipboard, and laminates without rapid edge wear.
- PTFE coating on the cutter portion (black or orange) - prevents pitch and adhesive buildup on the spiral flutes, reducing heat friction and extending the interval between tool cleanings or replacements.
- Precision-balanced centre point - ensures accurate hole positioning on entry, reducing wandering and producing consistently centered dowel holes across high-volume panel runs.
- 2 HW precision-ground cutting edges (Z2) - deliver sharp, repeatable cuts with each rotation, producing clean bore walls and flat hole bottoms critical for tight-fitting dowel joinery.
- 2 negatively ground spurs (V2) - score the panel surface cleanly before the cutters remove material, eliminating tearout on chipboard faces, laminates, and coated panels.
- 4 spiral flutes - efficiently evacuate chips from the bore during drilling, reducing heat buildup and preventing chip packing that can damage bore walls or stall the spindle.
- Parallel shank with driving flat and length adjusting screw - locks securely in multi-spindle boring machine chucks and CNC boring center collets, preventing slippage and allowing precise depth adjustment.
- Left-hand (LH) rotation - engineered for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, enabling simultaneous bilateral drilling in a single pass.
- 10 x 20mm shank - compatible with standard boring machine adapters and chucks used in panel processing centers and furniture production lines.
Why This Product
- Left-hand spindles require left-hand tooling - using a right-hand drill on an LH spindle causes the bit to unscrew from the chuck and produces damaged holes. This tool is specifically manufactured for LH rotation, making it the correct choice for left-side spindle positions on horizontal boring machines.
- The 70mm overall length with a 43mm cutting height is suited for panels requiring deeper blind holes - where standard-length dowel drills fall short, this long-series design reaches full depth without the shank interfering with the panel surface.
- The combination of negatively ground spurs and carbide cutting edges addresses one of the most common panel boring problems - face tearout. Clean entry scoring followed by sharp carbide removal produces holes ready for dowel insertion without sanding or rework.
- PTFE coating on the spiral directly reduces the frequency of production stoppages for tool cleaning in glue-heavy or resin-rich materials, supporting higher throughput in continuous furniture manufacturing workflows.
Specifications
- Manufacturer Part Number: 309.075.12
- Brand: CMT Orange Tools
- Diameter: 7.5mm
- Cutting Height: 43mm
- Total Length: 70mm
- Shank: 10 x 20mm parallel shank with driving flat and length adjusting screw
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Number of Flutes: 4
- Spur Sharpening: Negatively ground spurs
- Rotation: Left-Hand (LH)
- Blade Material: HW (Tungsten Carbide)
- Cutter Coating: Black or orange PTFE
Approved Applications
- Blind hole drilling for dowel connections and dowel joinery
- Panel drilling in furniture manufacturing and cabinet making
- Boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers
- High-volume production boring on CNC boring centers with boring machine adapters or chucks
Frequently Asked Questions
Why does this dowel drill have left-hand (LH) rotation, and how do I know if I need it?
Multi-spindle boring machines and CNC boring centers use both right-hand and left-hand spindles so that drills on opposite sides of the machine rotate in the correct cutting direction simultaneously. If your machine's spindle turns counterclockwise when viewed from above (or is labeled LH), you need a left-hand rotation bit like this one. Using the wrong rotation direction will prevent proper cutting and can cause the tool to back out of the chuck.
What is the purpose of the negatively ground spurs on this dowel drill?
The 2 negatively ground spurs score a clean circle on the panel face before the main carbide cutting edges remove the core material. This sequencing severs the surface fibers first, which prevents the drill from lifting or tearing the face veneer, laminate, or melamine coating around the hole opening - a common problem in chipboard and coated panel boring.
What does the PTFE coating on the cutter portion do, and does it affect cutting performance?
The PTFE (polytetrafluoroethylene) coating applied to the spiral flute area creates a low-friction surface that resists adhesion of wood resins, glues, and pitch. This means chips and sticky residues slide out of the bore more easily rather than packing into the flutes. The coating does not affect the carbide cutting edges themselves, so sharpness and cutting accuracy are maintained while tool cleaning intervals are extended.
Can this drill be used with a handheld drill or a standard drill press?
This tool is designed for use with multi-spindle boring machines, CNC boring centers, and panel processing centers that accept a 10 x 20mm parallel shank with a driving flat. The driving flat engages the machine's chuck to prevent rotation slippage under load. Standard handheld drills and most bench drill presses do not use this shank format and are not appropriate for this tool.
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