Product Description
CMT 311.082.12 Dowel Drill 8.2 x 35 x 70mm Left-Hand by CMT is a precision carbide-tipped boring tool engineered for clean, accurate blind-hole drilling in panel processing and furniture manufacturing applications. With an 8.2mm cutting diameter, 35mm cutting height, and 70mm overall length, this left-hand rotation dowel drill is built for multi-spindle CNC boring machines and panel processing centers where consistent hole quality and long tool life are essential. The tungsten carbide (HW) cutting head, PTFE-coated spiral body, and negatively ground spurs combine to deliver flat-bottomed holes with minimal tearout in chipboard, MDF, hardwood, softwood, plywood, laminates, and coated panels.
Key Features
- Tungsten Carbide (HW) Cutting Head - hard-wearing carbide material maintains cutting sharpness longer than standard steel, reducing tool change frequency in high-volume boring operations.
- PTFE-Coated Spiral Flutes - the orange or black PTFE coating on the spiral portion resists pitch and adhesive buildup, keeping flutes clear and maintaining consistent chip evacuation across long production runs.
- Precision-Balanced Centre Point - the HW centre point self-locates accurately on the workpiece, eliminating bit wander and ensuring repeatable hole positioning critical to tight-tolerance dowel joinery.
- 2 Negatively Ground Spurs (V2) - negatively set spurs score the material perimeter cleanly before the cutting edges engage, producing crisp, tearout-free hole walls in coated panels and laminates.
- 2 Precision Ground HW Cutting Edges - dual carbide cutting edges deliver smooth, flat-bottomed blind holes suited to dowel insertion without secondary finishing.
- 2 Spiral Flutes - twin flutes promote efficient chip and dust clearance during boring, helping maintain cut quality and reducing heat at the cutting zone.
- Super-Strength Steel Body - the robust steel shank and body withstand the high-cycle demands of automated multi-spindle boring, supporting consistent performance in production environments.
- Left-Hand (LH) Rotation - specifically designed for left-hand spindles on multi-spindle CNC and panel boring machines, ensuring correct engagement and chip ejection direction for that spindle orientation.
- Parallel Shank with Driving Flat and Length Adjusting Screw - the 10 x 30mm parallel shank seats securely in boring machine collets or chucks, while the driving flat prevents slippage and the adjusting screw allows precise boring depth setting.
Why This Product
- The 8.2mm diameter and 35mm cutting height make this drill a direct match for standard dowel joinery applications in furniture and cabinet production, where dimensional accuracy directly affects assembly fit and strength.
- Left-hand rotation is purpose-built for the LH spindle positions found on multi-spindle CNC boring machines and panel processing centers - using the correct rotation prevents tool damage and ensures proper chip flow.
- The combination of negatively ground spurs and a carbide cutting head addresses one of the most common boring problems in panel work - surface tearout on coated or laminated boards - delivering exit-quality results at entry speeds.
- The PTFE-coated spiral and HW construction together extend service life in continuous production environments, reducing downtime for tool changes and helping maintain consistent hole quality across large batch runs.
Specifications
- Manufacturer Part Number: 311.082.12
- Brand: CMT Orange Tools
- Diameter: 8.2mm
- 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 Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Coating: PTFE (orange or black) on spiral portion
Approved Applications
- Blind hole drilling for dowel connections
- Panel drilling in furniture manufacturing
- Cabinet making and case goods production
- CNC boring center operations
- Multi-spindle panel processing
- Boring in chipboard, MDF, HDF, hardwood, softwood, plywood, laminates, and coated panels
Frequently Asked Questions
What does left-hand (LH) rotation mean, and why does it matter?
Left-hand rotation means the drill spins counter-clockwise when viewed from the shank end. Multi-spindle CNC boring machines and panel processing centers include both right-hand and left-hand spindle positions. Using an LH drill in an LH spindle ensures the cutting edges engage the material correctly and chips are ejected in the proper direction - using a right-hand drill in an LH spindle would cause the tool to dull rapidly or fail to cut effectively.
What does "negatively ground spurs" mean for hole quality?
Negatively ground spurs are sharpened at an angle that causes them to score and sever the surface fibers of the material before the main cutting edges remove waste. This pre-scoring action is especially important when boring coated panels, laminates, and veneered boards, because it prevents the surface layer from tearing or chipping as the drill enters. The result is a clean, defined hole perimeter that requires no additional finishing.
What machines is this dowel drill compatible with?
The CMT 311.082.12 is designed for use in multi-spindle CNC boring machines, CNC boring centers, panel processing centers, and boring machines equipped with an adapter or chuck that accepts a 10 x 30mm parallel shank. The driving flat on the shank helps prevent slippage in the chuck, and the length adjusting screw allows the operator to set precise boring depth.
Is the PTFE coating purely cosmetic, or does it serve a functional purpose?
The PTFE coating applied to the spiral portion of the drill body is entirely functional. PTFE is a low-friction material that resists the adhesion of pitch, glue, and wood resins that accumulate during production boring. By preventing buildup in the flutes, the coating helps maintain consistent chip evacuation, reduces heat generation at the cutting zone, and extends the working life of the tool between cleanings or resharpening cycles.
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