Product Description
CMT Four Flute Dowel Drill 12 x 50 x 85mm Left-Hand by CMT is a precision boring tool engineered for clean, flat-bottom blind holes in furniture panels, cabinet components, and solid wood assemblies. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation dowel drill delivers consistent results in chipboard, MDF, hardwood, and coated panel materials. The 4 spiral flute design accelerates chip evacuation during deep boring operations, making it a reliable choice for multi-spindle CNC boring machines, panel processing centers, and boring machines fitted with an adapter or chuck.
Key Features
- HW (Tungsten Carbide) Cutting Head with 2 Precision-Ground Cutting Edges (Z2) - carbide construction maintains sharp geometry through extended production runs, reducing edge breakdown and rework on panel drilling lines.
- 2 Negatively Ground Spurs (V2) - score the perimeter of the bore ahead of the cutting edges, producing clean hole walls and flat-bottom blind holes with minimal tearout on laminates and coated panels.
- 4 Spiral Flutes - four flutes versus a standard 2-flute configuration means chips are cleared more rapidly from deep blind holes, lowering heat buildup and reducing the risk of chip packing in MDF and chipboard.
- Precision-Balanced Centre Point - the HW centre point self-locates accurately at the bore position, keeping holes on target for tight-tolerance dowel joinery in furniture manufacturing and cabinet making.
- PTFE Coating on the Cutter Portion - the black or orange PTFE non-stick coating prevents pitch and adhesive buildup on the spiral, extending service life and maintaining smooth chip flow between cleanings.
- Parallel Shank with Driving Flat (10 x 27mm) and Length-Adjusting Feature - the driving flat transmits torque reliably in boring machine chucks and adapters, while the length-adjusting capability allows precise depth setting on production equipment.
- Left-Hand (LH) Rotation - designed specifically for left-hand spindle positions on multi-spindle CNC boring machines and panel processing centers, ensuring correct cutting geometry and surface finish when used on the intended spindle side.
- Super-Strength Steel Body - the steel shank and body absorb vibration and resist deflection during high-cycle boring operations, supporting dimensional consistency across large batch runs.
Why This Product
- The combination of a carbide (HW) cutting head, negatively ground spurs, and 4 evacuation flutes makes this drill a purpose-built solution for high-volume furniture and cabinet panel boring - where clean holes, flat bottoms, and fast cycle times are all required simultaneously.
- The left-hand rotation designation is critical for proper operation: using this drill on a left-hand spindle ensures the cutting geometry and spur geometry engage the material in the correct direction, directly affecting hole quality and tool life.
- At 85mm total length with a 50mm cutting depth, this long-series drill reaches the blind hole depths needed for dowel connection joinery without the shank interfering with the panel surface - important when boring thicker panels or stacked workpieces.
- The PTFE-coated cutter portion addresses one of the most common productivity problems in panel boring - pitch and glue buildup - by passively repelling adhesive residue and resins, reducing downtime spent on tool cleaning during production shifts.
Specifications
- Manufacturer Part Number: 373.120.12
- Brand: CMT Orange Tools
- Diameter: 12mm
- Cutting Height: 50mm
- Total Length: 85mm
- Shank: 10 x 27mm (parallel shank with driving flat and length adjusting)
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Spur Sharpening: Negatively ground spurs
- Number of Flutes: 4 spiral flutes
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
- Cutter Coating: PTFE (black or orange)
Approved Applications
- Drilling blind holes for dowel connections in furniture manufacturing
- Panel drilling in cabinet making and case goods production
- Boring chipboard, MDF, HDF, hardwood, softwood, plywood, and coated panels
- Use on multi-spindle CNC boring machines
- Use on CNC boring centers and panel processing centers
- Use on boring machines with a compatible adapter or chuck
Frequently Asked Questions
Why does this dowel drill have 4 flutes instead of the standard 2?
The 4 spiral flutes are designed to evacuate chips faster than a 2-flute configuration, which is especially important when boring deep blind holes in dense materials like MDF, chipboard, and hardwood. Faster chip evacuation reduces heat at the cutting edges and lowers the risk of chip packing that can damage hole walls or the tool itself during production boring.
What is the purpose of the negatively ground spurs on this drill?
The 2 negatively ground spurs score the perimeter of the bore hole before the main cutting edges remove material. This pre-scoring action severs the surface fibers cleanly, which is the key reason this drill produces flat-bottom blind holes with clean walls and minimal tearout - particularly important when working with laminates, coated panels, and veneer surfaces where surface damage is not acceptable.
Why must this drill be used on a left-hand spindle?
This drill is ground and configured for left-hand (LH) rotation only. Using it on a right-hand spindle would cause the cutting edges and spurs to engage the material in the wrong direction, resulting in poor hole quality, rapid edge degradation, and potential tool failure. Always verify spindle rotation direction on your boring machine before installing this drill.
What does the PTFE coating on the cutter portion do?
The PTFE (polytetrafluoroethylene) non-stick coating applied to the cutter portion of the drill resists adhesion of pitch, resins, and glue residues that commonly build up on boring tools used in panel and furniture production. By preventing this buildup, the coating helps maintain smooth chip flow through the flutes and extends the interval between tool cleanings, supporting consistent performance over longer production runs.
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