Product Description
CMT Dowel Drill 7 x 35 x 70mm Left-Hand Rotation is a solid carbide boring bit engineered for high-precision dowel hole drilling in furniture manufacturing, cabinet making, and panel processing operations. Built from premium super micrograin carbide, this left-hand rotating drill delivers exceptionally clean, flat-bottom blind bores in hardwood, MDF, particle board, and veneered wood - making it a reliable choice for CNC boring centers and multi-spindle boring machines that demand consistent, chip-free results across high-volume production runs.
Key Features
- Solid super micrograin carbide construction - the entire bit is a single solid carbide unit sourced from Luxembourg, providing exceptional durability and allowing an almost infinite number of resharpenings, extending the life of the tool significantly compared to carbide-tipped alternatives.
- Curved, negatively ground spurs (2 spurs) - the unique tip geometry produces exceptionally clear bores with no rough edges or tearout, ensuring dowel joints seat cleanly without secondary finishing work.
- Centre-point balanced tip design - promotes accurate hole placement and reduces vibration during entry, which is especially important on CNC routers and high-speed boring units where positional accuracy is critical.
- Plunge edge extending to the centre of the bit - reduces drilling resistance during entry and increases production speed, so operators can run faster feed rates without sacrificing hole quality.
- Oversized cylindrical head - larger than traditional bit heads, this design offers greater resistance to wear during prolonged use, reducing downtime from tool changes in continuous production environments.
- Left-hand (LH) rotation - designed specifically for left-hand spindle positions on multi-spindle boring machines and CNC boring centers, ensuring correct chip evacuation and clean bore walls on the appropriate machine head.
- 10 x 30mm shank - a robust shank diameter that seats securely in compatible boring machine chucks and adapters, minimizing runout and maintaining bore accuracy.
- 2-flute geometry - dual cutting edges balance cutting forces and promote smooth chip clearance, keeping bores free of debris and reducing heat buildup during repeated drilling cycles.
- Ideal for hardwood and difficult composites - rated for particle board, MDF, veneered wood, and other demanding panel materials that quickly wear conventional high-speed steel bits, so solid carbide construction pays off in reduced tooling cost over time.
Why This Product
- Purpose-built for high-speed boring units and CNC routers - the solid carbide body, balanced centre point, and plunge-to-centre cutting edge are specifically designed for the demands of automated panel processing, where consistent hole quality across thousands of cycles matters most.
- Resharpenable solid carbide means lower long-term tooling cost - because the bit is a single solid unit of carbide rather than a carbide-tipped steel body, it can be resharpened an almost unlimited number of times, making it a cost-effective investment for production shops.
- Clean bores without rough edges reduce assembly time - the negatively ground curved spurs and plunge edge design eliminate the need for deburring or secondary hole cleanup, which speeds up dowel insertion and joint assembly in furniture and cabinet production.
- Correct rotation for left-hand spindle positions - choosing the right-hand or left-hand variant matters on multi-spindle machines, and this LH bit is the correct selection for left-hand spindle positions, preventing tool damage and ensuring proper chip ejection direction.
Specifications
- Manufacturer Part Number: 311.070.42
- Brand: CMT Orange Tools
- Diameter: 7mm
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 30mm
- Number of Spurs: 2
- Number of Teeth: 2
- Rotation: Left-Hand (LH)
- Material: HW (Solid Carbide - Super Micrograin)
Approved Applications
- Blind hole drilling for dowel connections in furniture manufacturing
- Cabinet making and panel drilling operations
- Drilling in hardwood, particle board, MDF, and veneered wood
- High-speed boring unit production runs
- CNC router and CNC boring center operations
- Multi-spindle panel processing center use
Frequently Asked Questions
What is the difference between this LH bit and a right-hand version, and how do I know which one I need?
LH (left-hand) rotation means the bit is designed to rotate counter-clockwise when viewed from the shank end. Multi-spindle boring machines use both left-hand and right-hand spindles arranged in fixed positions across the machine head. You need an LH bit for every left-hand spindle position on your machine to ensure correct chip ejection and clean bore walls. Using the wrong rotation direction on a spindle will cause poor cut quality and can damage the tool or workpiece.
Can this drill be used on materials other than solid wood?
Yes. The solid super micrograin carbide construction makes this bit well suited for difficult composite materials including particle board, MDF, and veneered wood - panel materials that are abrasive and tend to wear conventional bits quickly. The carbide construction maintains cutting edge integrity longer in these demanding materials than high-speed steel alternatives.
How many times can this bit be resharpened?
Because this is a solid carbide construction - meaning the entire bit is one homogeneous carbide unit rather than a carbide tip bonded to a steel body - it offers an almost infinite number of resharpenings. Each resharpening restores the cutting edges without compromising the structural integrity of the tool, making it a cost-effective long-term investment for production environments.
What shank size does this bit use, and what machines is it compatible with?
This bit uses a 10 x 30mm shank, which is the standard shank format for multi-spindle CNC boring machines, CNC boring centers, and panel processing centers. It can also be used in boring machines fitted with a compatible adapter or chuck. Always verify your machine's spindle collet or chuck accepts a 10mm shank before installing.
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