Product Description
CMT 311.050.11 Dowel Drill - 5 x 35 x 70mm Right-Hand is a precision-engineered 2-flute dowel boring bit built for clean, accurate blind-hole drilling in furniture panels, cabinetry, and solid wood components. With a tungsten carbide (HW) cutting head, negatively ground spurs, and a PTFE-coated spiral body, this drill is designed to deliver flat-bottom holes with crisp bore walls and minimal chip buildup - making it a reliable choice for high-volume panel processing and dowel joinery production work.
Key Features
- Tungsten Carbide (HW) Cutting Head - hard-wearing carbide material retains a sharp edge longer than standard steel, reducing the frequency of tool changes during production runs through chipboard, MDF, HDF, hardwood, and laminates.
- 2 Precision-Ground Carbide Cutting Edges - matched cutting geometry produces consistently sized holes shot to shot, supporting tight-tolerance dowel joints in furniture and cabinet assembly.
- 2 Negatively Ground Spurs - the inward-angled spur geometry scores the panel face cleanly before the main cutters engage, preventing surface tearout and delivering smooth bore walls on coated panels, laminates, and veneered boards.
- PTFE-Coated Spiral Flutes - the orange or black P.T.F.E. coating on the spiral reduces friction and resists pitch and adhesive buildup, keeping the flutes clear and maintaining cutting performance over extended use.
- Precision-Balanced Centre Point - the HW centre point registers accurately at the bore location without walking, ensuring repeatable hole placement critical for dowel alignment.
- Super-Strength Steel Body - the shank and body are machined from super-strength steel for rigidity under the lateral loads of multi-spindle boring operations.
- 10 x 30mm Parallel Shank with Driving Flat and Length Adjusting Screw - the standardized shank profile seats securely in multi-spindle CNC boring machine chucks and allows precise depth setting with the integrated adjusting screw.
- Right-Hand (RH) Rotation - compatible with the standard right-hand spindle configuration found on the majority of horizontal and vertical panel boring machines.
- 2 Spiral Flutes - dual-flute geometry efficiently evacuates chips from the bore, helping maintain a clean hole and reducing heat accumulation during deep blind-hole drilling.
Why This Product
- The negatively ground spurs and carbide cutting edges work together to produce clean, flat-bottomed blind holes with no surface tearout - a direct benefit for dowel connections in coated panels and laminates where finish quality is critical.
- At 70mm total length with a 35mm cutting height, this long-series bit reaches the deeper boring depth required for panels where standard-length bits cannot achieve adequate cut depth for solid dowel joints.
- The PTFE spiral coating actively resists glue and pitch adhesion, extending intervals between cleaning and maintaining consistent chip clearance - particularly valuable in production environments processing adhesive-coated or resin-rich materials.
- The parallel shank with driving flat and length adjusting screw is purpose-built for quick, repeatable setup on multi-spindle and CNC boring centers, reducing machine downtime when swapping or resetting bits.
Specifications
- Manufacturer Part Number: 311.050.11
- Brand: CMT Orange Tools
- Diameter: 5mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 30mm parallel shank with driving flat and length adjusting screw
- Number of Flutes: 2
- Number of Cutting Edges: 2
- Number of Spurs: 2
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Spiral Coating: Orange or black P.T.F.E.
- Rotation: Right-Hand (RH)
- Product Type: Dowel Drill
Approved Applications
- Blind hole drilling for dowel connections
- Panel boring in furniture manufacturing
- Cabinet making and case construction
- Boring in solid wood (hardwood and softwood)
- Drilling in chipboard and particleboard
- Boring in MDF and HDF
- Drilling in laminates and coated panels
- Plastics fabrication requiring precision dowel holes
- Multi-spindle CNC boring machine operations
- CNC boring center panel processing
Frequently Asked Questions
What is the difference between this long-series 70mm dowel drill and a standard-length dowel drill?
This bit has a total length of 70mm with a 35mm cutting height, which allows it to reach deeper into a panel when mounted in a multi-spindle head. This longer reach is needed for applications where standard-length dowel drills cannot achieve the full bore depth required for solid dowel joint connections.
What does "negatively ground spurs" mean and why does it matter?
Negatively ground spurs are angled inward relative to the cutting direction. This geometry scores the panel surface cleanly ahead of the main carbide cutting edges, which prevents the wood fibers or laminate face from tearing as the bit enters the material. The result is a cleaner bore opening with no rough edges - important when drilling coated panels, veneered boards, or laminates where surface appearance matters.
What does the PTFE coating on the spiral flutes do?
The P.T.F.E. coating on the spiral portion of the bit reduces friction and prevents pitch, resin, and adhesive from bonding to the flute surface. This keeps the chip evacuation path clear during drilling and helps maintain consistent cutting performance, especially when processing materials like chipboard or MDF that can release resinous particles during boring.
Is this bit compatible with standard CNC panel boring machines?
Yes. The 10 x 30mm parallel shank with driving flat and length adjusting screw is a standard configuration designed for use in multi-spindle CNC boring machines, CNC boring centers, and panel processing centers. The driving flat provides positive rotational engagement in the spindle chuck, and the adjusting screw allows precise depth setting without removing the bit from the machine.
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