Product Description
CMT 314.047.12 Dowel Drill for Through Holes - 3/16" Diameter, Left-Hand Rotation is a precision-engineered, carbide-tipped boring tool designed for clean, consistent through-hole drilling in panel processing and furniture manufacturing applications. Built for use in multi-spindle CNC boring machines and panel processing centers, this left-hand (LH) rotating drill delivers accurate 3/16" diameter through holes with minimal tearout, making it the professional's choice for dowel joinery in chipboard, MDF, hardwood, softwood, plywood, laminates, and coated panels.
Key Features
- HW (Tungsten Carbide) Head with Precision-Balanced Centre Point - the hardmetal tip maintains sharp, accurate geometry over extended production runs, reducing the need for frequent tool changes and ensuring repeatable hole quality in demanding panel processing environments.
- 2 Precision-Ground Cutting Edges (Z2) - dual cutting edges work together to produce smooth bore walls and flat-bottomed entry, delivering the clean, consistent results required for tight-fitting dowel joints in furniture and cabinetry work.
- 2 Spiral Flutes with PTFE Coating - the orange or black P.T.F.E.-coated spiral portion resists pitch and resin buildup, keeping the bit running freely and extending tool life between sharpenings in continuous production use.
- Super-Strength Steel Body - the steel shank and body construction withstands the mechanical stresses of high-cycle CNC boring operations, maintaining dimensional stability and tool life under production conditions.
- Parallel Shank with Driving Flat and Length-Adjusting Screw - the 10 x 26mm shank secures positively in boring machine spindles, while the driving flat and adjusting screw allow precise depth setting and prevent slippage during operation.
- Left-Hand (LH) Rotation - engineered specifically for left-hand spindle positions on multi-spindle boring machines, ensuring correct chip evacuation and clean hole geometry when used in the designed spindle orientation.
- 35mm Cutting Height with 70mm Overall Length - the cutting geometry accommodates through-hole drilling in panels up to approximately 35mm, while the total 70mm length suits standard spindle reach on CNC and multi-spindle boring centers.
- Through-Hole Geometry with 60 deg. Sharpening Angle - the point geometry is optimised for boring completely through the panel, preventing the stepped bottom of a blind-hole drill and allowing clean exit on the panel face opposite the entry point.
Why This Product
- Purpose-built for through-hole dowel boring - unlike general-purpose twist drills, the geometry of this bit is specifically configured for through-hole work, producing clean entry and exit faces that are essential for visible furniture joinery and flat-pack panel connections.
- Matches the spindle requirements of multi-spindle CNC boring equipment - the left-hand rotation, 10 x 26mm parallel shank with driving flat, and adjusting screw are matched to the standard spindle configurations found on horizontal and vertical CNC panel boring centers, reducing setup time and compatibility concerns.
- HW carbide tipping combined with PTFE-coated flutes extends service intervals - the hardmetal cutting head stays sharp longer in abrasive materials such as MDF, chipboard, and laminates, while the coated flutes resist resin and glue deposits that would otherwise slow chip clearance and degrade hole quality.
- Optimised for 3/16" dowel connections in panel manufacturing - the precise 3/16" diameter corresponds directly to standard dowel pin dimensions used in furniture component assembly, ensuring consistent fit and alignment without additional hand-fitting or rework.
Specifications
- Manufacturer Part Number: 314.047.12
- Brand: CMT Orange Tools
- Diameter: 3/16"
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 26mm
- Number of Cutting Edges: 2
- Rotation: LH (Left-Hand)
- Blade Material: HW (Tungsten Carbide)
- Sharpening Angle: Through holes 60 deg.
- Application Type: Through Hole Dowel Drill
Approved Applications
- Through-hole drilling for dowel joint connections
- Panel processing and flat-pack furniture manufacturing
- Chipboard and particleboard boring
- MDF and HDF panel drilling
- Hardwood and softwood through-hole boring
- Plywood, laminate, and coated panel drilling
- CNC multi-spindle boring center production runs
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill, such as this CMT 314.047.12, is designed to bore completely through the panel from one face to the other. The point geometry and cutting edge configuration are optimised to exit the panel cleanly without blowout, making it suitable for through-bolt or through-dowel joinery. A blind-hole drill, by contrast, is intended to stop at a set depth without exiting the opposite face.
Why does the rotation direction matter when selecting a dowel drill for a CNC boring machine?
Multi-spindle CNC boring machines and panel processing centers use spindles that rotate in fixed directions - some left-hand (LH), some right-hand (RH). Using a drill with the wrong rotation direction in a given spindle will cause the cutting edges to rub rather than cut, resulting in poor hole quality and rapid tool wear. The CMT 314.047.12 is specifically a left-hand (LH) rotation drill and must be used in a left-hand spindle position.
What does the PTFE coating on the spiral flutes do?
The orange or black P.T.F.E. coating applied to the spiral portion of this drill reduces friction and prevents pitch, resin, and adhesive deposits from bonding to the flute surfaces. In production environments where coated panels, laminates, or resinous wood composites such as MDF and chipboard are processed, buildup on the flutes can obstruct chip evacuation and reduce cutting efficiency. The PTFE coating helps the flutes stay clear, extending tool life and maintaining consistent hole quality between sharpenings.
What shank size and configuration does this dowel drill use?
This drill uses a 10 x 26mm parallel shank equipped with a driving flat and a length-adjusting screw. The driving flat provides a positive mechanical connection to the spindle chuck or holder, preventing rotation of the shank under load. The length-adjusting screw allows the tool projection to be set precisely for the panel thickness being processed, ensuring accurate through-hole depth without adjustment errors.
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