Product Description
CMT 307.070.12 Dowel Drill - 7 x 40 x 67mm Left-Hand Rotation by CMT is a precision-engineered left-hand (LH) rotation boring tool designed for clean, accurate blind hole drilling in furniture panels, cabinet components, and wood-based sheet materials. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this 7mm dowel drill delivers the flat-bottom bore geometry and smooth sidewall finish that dowel joinery and panel assembly demand. With a 40mm cutting height and a compact 67mm overall length, it fits the working envelopes of multi-spindle boring machines and CNC boring centers where precise depth control and consistent hole quality are non-negotiable.
Key Features
- Super-strength steel body with HW (tungsten carbide) head - combines the toughness of a rigid steel shank with the wear resistance of carbide, extending service life across high-volume production runs in hardwood, chipboard, MDF, and coated panels.
- Precision-balanced centre point - keeps the drill centered on entry, reducing wander and ensuring hole placement accuracy critical to dowel alignment in furniture assembly.
- 2 HW precision-ground cutting edges (Z2) - carbide-tipped flutes shear material cleanly rather than tearing it, producing flat-bottom holes with consistent diameter and smooth bore walls ready for dowel insertion without secondary finishing.
- 2 negatively ground spurs (V2) - score the perimeter of the bore ahead of the cutting edges, eliminating tearout and delamination at the hole entrance - especially valuable when drilling laminates, coated panels, and veneered surfaces.
- Left-hand (LH) rotation - engineered specifically for LH spindle positions on multi-spindle boring machines, allowing mixed-direction drilling in a single machine pass without repositioning workpieces.
- 8 x 20mm parallel shank - a standardized shank diameter compatible with the chucks and collets found on panel processing centers and CNC boring equipment, ensuring secure tool retention and minimal runout.
- 40mm cutting height with 67mm overall length - provides sufficient boring depth for blind hole dowel connections in standard panel thicknesses while keeping the tool compact enough for tight spindle pitch applications.
Why This Product
- Left-hand spindle compatibility built in - this drill is purpose-built for LH rotation, making it the correct replacement or companion tool for the LH spindle positions on multi-row boring heads without requiring an adapter or workaround.
- Negatively ground spurs protect finished surfaces - furniture panels with melamine, laminate, or veneer faces are especially vulnerable to chip-out around hole edges. The V2 negatively ground spurs score the material perimeter before the flutes cut, delivering a clean entrance suitable for visible or glue-faced panel surfaces.
- Carbide cutting edges sustain sharpness through abrasive sheet materials - chipboard, MDF, and HDF all contain binders and resins that dull high-speed steel quickly. The HW (tungsten carbide) cutting head maintains edge geometry longer, reducing downtime for tool changes during production runs.
- Precision-balanced design supports repeatable hole accuracy - in dowel joinery, even small positional errors accumulate across multiple holes and lead to misaligned assemblies. The balanced centre point and precision-ground geometry support the hole-to-hole repeatability that flat-pack and cabinet production workflows require.
Specifications
- Manufacturer Part Number: 307.070.12
- Brand: CMT Orange Tools
- Diameter: 7mm
- Cutting Height: 40mm
- Total Length: 67mm
- Shank: 8 x 20mm
- Rotation: Left-Hand (LH)
- Number of Cutting Edges: 2 (Z2)
- Number of Spurs: 2 (V2)
- Spur Sharpening: Negatively ground spurs
- Blade Material: HW (Tungsten Carbide)
- Body Material: Super-strength steel
Approved Applications
- Blind hole drilling for dowel connections in panel and solid wood furniture
- Cabinet making and flat-pack furniture manufacturing
- Panel drilling on chipboard, MDF, and HDF components
- Drilling laminates and coated or veneered panels with clean hole entry
- Multi-spindle CNC boring machine operations requiring left-hand rotation tooling
- CNC boring centers and panel processing centers
Frequently Asked Questions
Why does this dowel drill use left-hand (LH) rotation instead of the more common right-hand rotation?
Multi-spindle boring machines used in furniture and panel production typically carry both right-hand and left-hand spindles arranged in rows. The LH spindles require left-hand rotation tooling to drill correctly. This 307.070.12 is built specifically for those LH spindle positions, enabling a single machine pass to bore all required holes across a panel without repositioning the workpiece.
What do "negatively ground spurs" mean and why does it matter for panel drilling?
Negatively ground spurs are angled to score the outer perimeter of the bore before the main cutting edges remove material. This scribing action severs wood fibers, laminate coatings, or veneer faces cleanly at the hole boundary, preventing the chip-out and delamination that can occur when drilling coated panels, laminates, and veneered surfaces. The result is a clean-edged hole entrance that meets the appearance requirements of visible or glue-faced furniture panels.
What materials can this 7mm dowel drill be used on?
The HW (tungsten carbide) cutting head and negatively ground spurs make this drill suited for solid hardwood, softwood, chipboard, MDF, HDF, plywood, laminates, and coated or veneered panels. The carbide cutting edges maintain their geometry longer than high-speed steel when drilling the resin-rich binders present in engineered wood panels, supporting consistent hole quality across extended production runs.
Is the 8 x 20mm shank compatible with standard boring machine chucks?
Yes. The 8 x 20mm parallel shank is a widely used standard dimension on multi-spindle boring machines, CNC boring centers, and panel processing centers. It seats securely in the chucks and collets designed for that shank size, providing stable tool retention and minimal runout during the boring cycle.
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