Product Description
CMT 308.070.12 Dowel Drill - 9/32" x 1 3/16" x 2 17/64" Left-Hand Rotation is a precision carbide-tipped boring tool engineered for clean, flat-bottom blind holes in panel processing and cabinetry applications. Built by CMT with a tungsten carbide (HW) cutting edge and negatively ground spurs, this left-hand (LH) dowel drill delivers accurate, splinter-free holes in solid wood, chipboard, MDF, HDF, plywood, laminates, and coated panels. Its 7mm diameter, 10x20mm parallel shank, and short-series 57.5mm overall length make it a precise fit for multi-spindle CNC boring machines and panel processing centers that require left-hand rotation tooling.
Key Features
- Tungsten Carbide (HW) Cutting Material - delivers long-lasting edge retention and consistent performance through high-volume panel boring cycles, reducing tool change frequency and downtime.
- Negatively Ground Spurs (2 spurs) - score the material perimeter before the cutting edge engages, producing clean bore walls and flat-bottom blind holes with no tearout or rough edges - critical for visible cabinet panels and coated surfaces.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers, ensuring correct chip evacuation direction and hole quality on paired-spindle setups.
- Short-Series Length (57.5mm Total / 30mm Cutting Height) - the compact 2 17/64" overall length and 1 3/16" cutting depth minimize deflection and maximize rigidity during high-speed blind-hole operations, improving bore accuracy.
- 10x20mm Parallel Shank with Driving Flat - provides secure, repeatable seating in CNC boring machine chucks and adapters, preventing slippage and maintaining consistent hole depth registration across large panel runs.
- 2-Flute / 2-Spur Geometry - balanced cutting action reduces vibration and heat buildup, extending bit life and maintaining tight tolerances across MDF, chipboard, hardwood, softwood, and laminated panel materials.
Why This Product
- Left-hand rotation tooling is a direct requirement for LH spindle positions on multi-spindle CNC boring machines - this bit is purpose-built for that specific spindle orientation, eliminating the risk of using incorrect-rotation tooling that causes poor hole quality or tool damage.
- The negatively ground spur geometry is especially suited for laminated panels and coated boards where surface tearout at the bore entry is unacceptable - the spurs pre-score the face before material is removed, preserving the decorative surface.
- At 7mm diameter with a 10x20mm shank, this bit matches the standard boring module sizing common to cabinet and furniture production equipment, making it a direct replacement for worn or damaged LH dowel drills without requiring adapter changes.
- Carbide (HW) construction means this bit maintains sharp cutting geometry through demanding production runs in abrasive materials like MDF and HDF - where high-speed steel alternatives dull quickly and produce increasingly rough hole walls.
Specifications
- Manufacturer Part Number: 308.070.12
- Brand: CMT Orange Tools
- Product Type: Dowel Drill
- Diameter: 7mm (9/32")
- Cutting Height: 30mm (1 3/16")
- Total Length: 57.5mm (2 17/64")
- Shank: 10x20mm
- Number of Spurs: 2
- Number of Teeth: 2
- Sharpening: Negatively ground spurs
- Blade Material: Carbide (HW)
- Rotation: Left-Hand (LH)
- Series: Short Series
Approved Applications
- Chipboard and particleboard panels
- MDF (medium-density fiberboard)
- HDF (high-density fiberboard)
- Hardwood
- Softwood
- Plywood
- Laminates and coated panels
- Blind hole dowel boring on multi-spindle CNC boring machines
- Panel processing centers and CNC boring centers
- Boring machines with adapter or chuck (left-hand spindle positions)
Frequently Asked Questions
What does left-hand (LH) rotation mean and why does it matter for this drill?
Left-hand rotation means the bit is designed to spin counterclockwise when viewed from the tip. Multi-spindle CNC boring machines use both right-hand and left-hand spindles in paired configurations. Installing a left-hand drill on an LH spindle ensures correct cutting action, proper chip evacuation, and clean hole walls. Using a right-hand drill on an LH spindle would cause the bit to dull rapidly and produce poor hole quality.
What is the cutting depth and total reach of this dowel drill?
This bit has a cutting height of 30mm (1 3/16") and a total length of 57.5mm (2 17/64"). It is a short-series drill, meaning it is optimized for the shallow blind-hole depths typical in dowel joinery and cabinet panel boring - not through-hole or deep-bore applications.
What shank size and type does this drill use?
The shank is 10x20mm - a parallel shank with a driving flat. This is a standard sizing for CNC boring machine modules and compatible boring centers. The driving flat prevents rotation within the chuck and ensures consistent depth registration across long production runs.
Can this drill be used on MDF and laminated panels without surface tearout?
Yes. The negatively ground spurs pre-score the material at the bore perimeter before the main cutting edge removes material. This spur geometry is specifically effective in MDF, HDF, chipboard, laminates, and coated panels where clean entry is required - minimizing surface damage that would be visible in finished cabinetry or furniture panels.
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