Product Description
CMT 311.060.22 Dowel Drill 6 x 30 x 70mm Left-Hand by CMT is a solid carbide boring bit engineered for precise, clean blind-hole drilling in furniture panels, cabinet components, and engineered wood products. Built from premium super-micrograin carbide, this 6mm left-hand rotation dowel drill delivers exceptional bore quality in demanding materials including hardwood, MDF, particle board, and veneered panels - making it a reliable choice for high-speed multi-spindle boring machines and CNC routing centers alike.
Key Features
- Solid HWM (super-micrograin carbide) construction - provides extreme wear resistance and allows an almost infinite number of resharpenings, lowering long-term tooling cost per hole.
- 2 curved, negatively ground spurs (V2) - produce exceptionally clean bore walls and flat-bottom holes with no rough edges or tearout, reducing finishing time and rework.
- Centre-balanced tip with plunge edge running to centre - reduces drilling resistance and increases production speed, keeping cycle times short on automated boring equipment.
- Cylindrical head larger than traditional tips - offers heightened resistance to prolonged use, maintaining dimensional accuracy over extended production runs.
- Left-hand (LH) rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines, ensuring proper chip evacuation and bore quality.
- 10 x 27mm parallel shank with driving flat - provides secure, slip-resistant seating in compatible chucks and boring heads for consistent hole placement.
- Extreme sharpening rating - the solid carbide body can be resharpened repeatedly to like-new geometry, extending the working life of the bit far beyond that of brazed-tip alternatives.
- 2 cutting edges (Z2) with 2 spiral flutes - work together to clear chips efficiently and maintain a clean, accurate bore diameter of 6mm across all supported materials.
Why This Product
- Engineered for difficult composites - the super-micrograin carbide construction handles abrasive materials such as particle board, MDF, HDF, and veneered wood where high-speed steel bits wear rapidly, reducing downtime caused by frequent bit changes.
- Optimized for CNC and multi-spindle boring centers - the balanced centre point and reduced drilling resistance make this bit well suited to automated production environments where consistent hole quality and throughput are critical.
- Resharpening capability reduces tooling expense - because the bit is a solid carbide unit rather than a tipped design, each resharpening restores the full cutting geometry, delivering a lower cost per bore over the life of the tool.
- Clean bores mean stronger dowel joints - the negatively ground spurs minimize fiber breakout around the bore entrance, producing tight, accurate holes that seat dowels properly and improve overall joint integrity in furniture and cabinet assemblies.
Specifications
- Manufacturer Part Number: 311.060.22
- Brand: CMT Orange Tools
- Description: Dowel Drill 6 x 30 x 70mm LH
- Diameter: 6mm
- Cutting Height: 30mm
- Total Length: 70mm
- Shank: 10 x 27mm
- Rotation: Left-Hand (LH)
- Number of Spurs: 2
- Number of Teeth: 2
- Blade Material: HWM (super-micrograin carbide)
- Sharpening: Extreme
Approved Applications
- Blind hole drilling for dowel joinery in furniture manufacturing
- Cabinet panel boring on multi-spindle and CNC boring centers
- Dowel connection drilling in hardwood and softwood components
- Panel processing in MDF, HDF, particle board, and veneered wood
- High-speed production boring on CNC routers with left-hand spindles
- Laminate and coated panel drilling requiring clean, tearout-free bores
Frequently Asked Questions
Why does this dowel drill use left-hand (LH) rotation?
Multi-spindle boring machines typically use both right-hand and left-hand spindle positions to drill multiple holes simultaneously. This 6mm bit is engineered for left-hand spindle positions, ensuring that chip evacuation flows in the correct direction and bore quality is maintained. Using a left-hand bit on a right-hand spindle - or vice versa - will result in poor cutting performance and damaged bores.
What materials can this 6mm carbide boring bit handle?
The solid HWM super-micrograin carbide construction makes this bit well suited for hardwood, softwood, particle board, MDF, HDF, veneered wood, and difficult composites. The negatively ground spurs are specifically designed to produce clean, chip-free bore entrances in abrasive engineered wood materials where standard high-speed steel bits wear prematurely.
Can this bit be resharpened, and how many times?
Yes. Because the bit is constructed entirely from solid carbide rather than a steel body with a brazed carbide tip, it can be resharpened an almost infinite number of times. Each resharpening restores the full cutting geometry - including the curved, negatively ground spurs - provided it is performed by a qualified tool grinder using appropriate carbide grinding equipment. The solid construction also provides extra safety compared to tipped designs, as there is no brazed joint that can fail under heat or stress.
What shank size does the CMT 311.060.22 use, and what machines accept it?
This bit uses a 10 x 27mm parallel shank with a driving flat. This shank style is the standard format for multi-spindle CNC boring machines, boring centers, and panel processing centers used in furniture and cabinet manufacturing. The driving flat prevents rotation in the chuck under load, ensuring that the 6mm bore diameter is held accurately throughout the drilling cycle.
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