Product Description
CMT 309.110.12 Dowel Drill - 11 x 43 x 70mm Left-Hand Rotation is a precision-engineered, carbide-tipped boring tool built for high-volume furniture manufacturing, cabinet production, and panel processing applications. Designed for left-hand spindle rotation, this dowel drill produces clean, flat-bottom blind holes in chipboard, MDF, hardwood, softwood, plywood, and coated laminates - exactly the kind of consistent, repeatable results required on multi-spindle CNC boring machines and industrial boring centers. The 70mm overall length makes it well suited for deeper blind hole applications in thicker panel stock, while the tungsten carbide (HW) cutting head and PTFE-coated spiral flutes combine durability with smooth chip evacuation.
Key Features
- Tungsten carbide (HW) cutting head - delivers long service life and maintains cutting edge sharpness across high-production panel drilling runs, reducing downtime and tool change frequency.
- PTFE coating on the cutter portion - prevents pitch, resin, and glue buildup on the spiral flutes, keeping the tool running cleanly through coated panels, laminates, and adhesive-heavy materials.
- 2 precision-ground negatively set spurs (V2) - score the material perimeter cleanly before the main cutters engage, eliminating tearout and producing smooth, crisp bore walls on both faces of the panel.
- 2 HW precision-ground cutting edges (Z2) - provide balanced, efficient material removal that results in flat-bottom holes ideal for dowel insertion and assembly joinery.
- 4 spiral flutes - promote efficient chip clearance during deep blind hole drilling, reducing heat buildup and helping maintain hole quality in MDF, chipboard, and dense hardwoods.
- Precision balanced centre point - ensures accurate hole placement on entry, critical for tight-tolerance dowel alignment in furniture and cabinet panel assemblies.
- Parallel shank with driving flat and length adjusting screw (10 x 20mm) - provides secure, consistent seating in multi-spindle boring machine chucks and CNC boring center toolholders, with repeatable depth setting capability.
- Left-hand rotation (LH) - matches left-hand spindle positions on multi-spindle boring machines, ensuring proper cutting action and clean hole geometry on LH stations.
- Super-strength steel body - gives the tool rigidity under the lateral and axial loads of industrial panel boring, resisting deflection and maintaining positional accuracy.
Why This Product
- Built specifically for left-hand spindle boring: not all dowel drills are available in both rotation directions - this LH version ensures correct cutting geometry on left-hand stations of multi-spindle machines, where using a right-hand drill would produce poor hole quality and rapid edge failure.
- Engineered for production panel work: the combination of a carbide (HW) head, PTFE-coated flutes, and negatively ground spurs addresses the three most common causes of hole quality failure in high-volume drilling - edge wear, material adhesion, and surface tearout.
- Deeper reach for thicker panels: the 70mm overall length and 43mm cutting height accommodate panel thicknesses that standard short-series dowel drills cannot reach, making this drill a practical solution when boring deep blind holes for concealed dowel joinery.
- Repeatable depth setting for precise assemblies: the length adjusting screw on the parallel shank allows operators to dial in and lock a consistent boring depth, which is essential for uniform dowel hole depth across large batch furniture and cabinet production runs.
Specifications
- Manufacturer Part Number: 309.110.12
- Brand: CMT Orange Tools
- Diameter: 11mm
- 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
- Spur Sharpening: Negatively ground spurs
- Number of Flutes: 4
- Blade Material: Tungsten Carbide (HW)
- Product Type: Dowel Drill
Approved Applications
- Blind hole drilling for dowel joinery connections
- Panel drilling in furniture manufacturing
- Cabinet carcass and face frame boring
- CNC boring center operations on left-hand spindle stations
- Multi-spindle boring machine panel processing
- Deep blind hole boring in thick panel stock
Frequently Asked Questions
What is the difference between a left-hand (LH) and right-hand (RH) dowel drill, and why does it matter?
Multi-spindle boring machines have both left-hand and right-hand rotating spindles arranged across the boring head. A left-hand drill is designed to cut correctly when spinning counter-clockwise, matching the rotation of LH spindle positions. Installing a right-hand drill on an LH spindle would cause the cutting edges to rub rather than cut, producing poor hole quality, excessive heat, and rapid tool damage. This CMT 309.110.12 is a left-hand rotation drill specifically intended for LH spindle positions.
What does the PTFE coating on the drill do?
The PTFE coating applied to the cutter portion of this dowel drill acts as a non-stick surface layer on the spiral flutes. In panel materials such as coated laminates, chipboard, and MDF - where adhesives and resins are common - this coating prevents pitch and glue from bonding to the tool body. The result is reduced friction, cleaner chip evacuation, and extended periods of reliable performance before cleaning or replacement is needed.
Why are the spurs negatively ground on this dowel drill?
Negatively ground spurs are angled to score and sever the panel surface fibers cleanly before the main carbide cutting edges remove the core material. This shearing action at the bore perimeter prevents the wood fibers or laminate surface from tearing or chipping as the drill enters and exits, producing a clean, sharp hole rim. This is especially important when drilling coated panels, laminates, and veneered chipboard where surface appearance is critical.
What machines is this dowel drill compatible with?
This drill uses a 10 x 20mm parallel shank with a driving flat and a length adjusting screw, which is the standard interface for industrial multi-spindle CNC boring machines, CNC boring centers, and panel processing centers. It can also be used in boring machines equipped with an appropriate adapter or chuck that accepts this shank format. The driving flat prevents the shank from rotating in the chuck under load, ensuring consistent hole placement.
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