Product Description
CMT 311.090.12 Dowel Drill - 9 x 35 x 70mm Left-Hand Rotation is a precision-engineered, carbide-tipped boring tool built for furniture manufacturing, cabinet making, and panel processing. Designed with a left-hand (LH) rotation, this 9mm diameter dowel drill produces clean, flat-bottom blind holes for dowel joinery in chipboard, MDF, hardwood, softwood, plywood, laminates, and coated panels. The 70mm overall length and 35mm cutting height make it well suited for deeper boring applications where a standard-length drill would fall short. A super-strength steel body, PTFE-coated spiral, and precision-ground tungsten carbide cutting edges combine to deliver consistent hole quality across high-volume panel processing operations.
Key Features
- Tungsten carbide (HW) cutting head - hard-wearing carbide resists dulling during repetitive drilling in abrasive engineered wood products like chipboard, MDF, and laminated panels, extending tool life between sharpenings.
- 2 precision-ground HW cutting edges - dual carbide edges share the cutting load evenly, producing consistently flat hole bottoms essential for tight-fitting dowel connections and flush panel assembly.
- 2 negatively ground spurs - the negative grind geometry scores the material perimeter cleanly before the main cutting edges engage, preventing surface tearout and delivering smooth bore walls on both raw and coated panel faces.
- PTFE-coated spiral flutes - the orange or black PTFE coating reduces friction and prevents resin, pitch, and adhesive buildup in the flutes, keeping the tool cutting freely and reducing heat generation during continuous production runs.
- Precision-balanced centre point - ensures accurate hole placement and self-centering entry, reducing workpiece movement and improving repeatability on multi-spindle boring machines and CNC boring centers.
- Left-hand (LH) rotation - engineered specifically for left-hand spindle positions on multi-spindle boring machines, allowing correct chip evacuation and clean cutting action when used in the designated spindle orientation.
- 10 x 30mm parallel shank with driving flat and length adjusting screw - the driving flat prevents slipping under torque, and the length adjusting screw allows precise depth setting, ensuring consistent hole depth across every spindle in a multi-spindle configuration.
- Super-strength steel body - the steel core absorbs vibration and resists flex during high-feed boring operations, maintaining dimensional accuracy and reducing the risk of tool breakage.
Why This Product
- Engineered for left-hand spindle positions - many multi-spindle boring machines require matched sets of right-hand and left-hand drills to cover all spindle positions simultaneously. This LH drill fills those positions correctly, allowing a full machine setup with a single pass across a panel.
- Long-series 70mm length opens up deeper boring capability - the 70mm overall length and 35mm cutting height provide clearance and depth that a standard-series drill cannot reach, making this the appropriate choice when workpiece thickness or machine geometry demands greater reach.
- Negatively ground spurs protect finished panel surfaces - for furniture and cabinet panels where the exposed face must remain scratch- and tearout-free, the precision-ground spur geometry scores the surface cleanly before material removal begins, eliminating the rework caused by ragged hole edges.
- PTFE coating supports continuous production without frequent cleaning - in high-throughput panel shops where downtime for tool cleaning reduces output, the PTFE-coated flutes shed adhesive and pitch buildup, keeping the drill operating at full efficiency longer between maintenance stops.
Specifications
- Manufacturer Part Number: 311.090.12
- Brand: CMT Orange Tools
- Description: Dowel Drill 9 x 35 x 70mm LH
- Diameter: 9mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 30mm parallel shank with driving flat and length adjusting screw
- Rotation: Left-Hand (LH)
- Number of Flutes: 2
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Spiral Coating: PTFE (orange or black)
Approved Applications
- Blind hole drilling for dowel connections in panel and solid wood assemblies
- Furniture manufacturing - cabinet carcass and face frame boring
- Cabinet making - shelf pin, hinge, and hardware boring
- Panel processing in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
- Multi-spindle CNC boring machine operations requiring left-hand spindle tooling
- CNC boring center and panel processing center applications
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 position spindles in both right-hand and left-hand configurations so that all spindles rotate toward the workpiece simultaneously. If your machine has left-hand spindle positions, you must use LH-rotation drills in those positions to achieve correct chip evacuation and clean cutting. Using a right-hand drill in a left-hand spindle would cause the tool to cut in reverse, producing poor hole quality and potential tool damage. Check your machine's spindle layout to confirm which positions require LH tooling.
What does "negatively ground spurs" mean, and why does it matter for panel drilling?
Negatively ground spurs are sharpened with a geometry that slices the material fibers at the perimeter of the hole before the main cutting edges remove the core material. This scoring action severs the surface cleanly rather than tearing it, which is especially important when drilling coated panels, laminates, or veneered surfaces where a ragged hole edge would be visible in the finished product. The result is a clean bore wall and a flat hole bottom suitable for precision dowel joinery.
What is the purpose of the PTFE coating on the spiral flutes?
The PTFE coating applied to the spiral portion of this drill reduces friction between the flutes and the material being cut. This low-friction surface prevents pitch, resin, and wood glue from bonding to the tool during drilling. Without this coating, adhesive and resin buildup in the flutes can restrict chip clearing, increase heat, and reduce cutting efficiency. The PTFE coating helps maintain consistent performance across extended production runs and reduces the frequency of tool cleaning.
What shank size does this drill use, and how is depth adjusted?
This drill uses a 10 x 30mm parallel shank fitted with a driving flat and a length adjusting screw. The driving flat locks positively into the spindle chuck to prevent rotation under torque. The length adjusting screw allows the drill to be set to a precise projection length from the spindle face, ensuring uniform hole depth across all spindles in a multi-spindle machine setup without the need to measure each drill individually.
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