Product Description
CMT 314.055.12 Dowel Drill for Through Hole - 7/32" x 35 x 70mm Left-Hand Rotation is a precision-engineered, carbide-tipped boring tool designed for clean, accurate through-hole drilling in panel processing and furniture manufacturing. Built on a super-strength steel body with a tungsten carbide (HW) cutting head, this left-hand rotation dowel drill is purpose-built for multi-spindle CNC boring machines and panel processing centers where repeatable accuracy and long tool life are essential. The 7/32" diameter and 35mm cutting height make it well-suited for through-hole dowel connections in chipboard, MDF, solid wood, and coated panels up to 30mm thick.
Key Features
- HW (Tungsten Carbide) Cutting Head with Precision Balanced Centre Point - delivers accurate hole positioning and consistent bore entry, reducing setup time and scrap in high-volume panel operations.
- 2 Precision Ground Cutting Edges (Z2) - dual cutting edges produce smooth bore walls and clean exits, minimizing tearout and blowout when drilling through panels.
- 2 Spiral Flutes with PTFE Coating - the orange or black P.T.F.E. coating on the spiral portion prevents pitch and glue buildup, extending service life between sharpenings and maintaining cutting efficiency.
- Super-Strength Steel Body - provides the structural rigidity needed to withstand the demands of continuous production boring without deflection or premature fatigue.
- Parallel Shank with Driving Flat and Length Adjusting Screw (10 x 26mm) - ensures secure, repeatable tool seating in multi-spindle boring heads and CNC chucks, eliminating slippage during through-hole drilling cycles.
- Left-Hand (LH) Rotation - engineered specifically for left-hand spindle positions on multi-spindle boring machines, ensuring correct cutting geometry and chip evacuation for that spindle orientation.
- Through-Hole Geometry Optimized for 60 deg. Sharpening - the through-hole tip geometry channels material cleanly through the panel exit, preventing blowout on the back face of the workpiece.
- 70mm Total Length with 35mm Cutting Height - the extended length accommodates panels up to 30mm thick while keeping the tool firmly engaged in the spindle for maximum stability.
Why This Product
- Designed Specifically for Through-Hole Dowel Applications - unlike general-purpose drill bits, this tool is engineered with a through-hole tip geometry that prevents blowout on panel exit, making it the right choice for furniture components where both faces of the panel must remain clean and undamaged.
- PTFE-Coated Spirals Reduce Downtime - the P.T.F.E. coating on the flutes actively resists adhesive and resin buildup common when boring MDF, coated panels, and laminates, meaning fewer cleaning stops and longer intervals between tool changes in production environments.
- Correct LH Rotation for Left-Side Spindle Positions - using a right-hand drill in a left-hand spindle position produces poor cutting geometry and rapid edge degradation; this tool is purpose-matched to LH spindle positions, protecting both the workpiece quality and the cutting edge.
- Carbide (HW) Tipping on an HW Head - the hardmetal cutting head maintains its edge far longer than high-speed steel alternatives when boring abrasive engineered wood products like chipboard, HDF, and laminates, reducing cost per hole over the life of the tool.
Specifications
- Manufacturer Part Number: 314.055.12
- Brand: CMT Orange Tools
- Diameter: 7/32"
- Cutting Height: 35mm
- Total Length: 70mm
- Shank: 10 x 26mm (parallel shank with driving flat and length adjusting screw)
- Number of Cutting Edges: 2 (Z2)
- Number of Spiral Flutes: 2
- Blade Material: HW (Tungsten Carbide)
- Rotation: Left-Hand (LH)
- Hole Type: Through Hole
- Sharpening Angle: 60 deg.
- Spiral Coating: P.T.F.E. (orange or black)
Approved Applications
- Through-hole drilling for dowel joinery connections
- Panel processing on multi-spindle CNC boring machines
- Furniture manufacturing and cabinet component production
- Boring through chipboard, MDF, HDF, hardwood, softwood, plywood, and laminates
- Coated and laminated panel drilling where clean entry and exit faces are required
Frequently Asked Questions
What is the difference between a through-hole dowel drill and a blind-hole dowel drill?
A through-hole dowel drill is designed to bore completely through a panel, with a tip geometry that evacuates material cleanly to prevent blowout on the back face of the workpiece. The CMT 314.055.12 uses this through-hole geometry, making it the correct choice when the drill must exit the opposite face of the panel cleanly rather than stopping at a set depth inside the material.
Why does this dowel drill use left-hand (LH) rotation?
Multi-spindle boring machines and CNC boring centers use both right-hand and left-hand spindle positions to simultaneously bore multiple holes from both sides or at mirrored positions across a panel. A left-hand spindle position requires a left-hand rotation tool so that the cutting edges engage the material correctly. Using a right-hand tool in a left-hand spindle produces rubbing rather than cutting, causing rapid edge wear and poor hole quality. The CMT 314.055.12 is specifically built for LH spindle positions.
What is the purpose of the P.T.F.E. coating on the spiral flutes?
The P.T.F.E. (polytetrafluoroethylene) coating applied to the spiral portion of this dowel drill prevents pitch, glue, and resin from adhering to the flutes during boring. This is particularly important when drilling chipboard, MDF, coated panels, and laminates, which release adhesives and resins under cutting heat. By resisting buildup, the coating helps maintain chip evacuation efficiency and extends the interval between cleaning and sharpening cycles.
What machines is the 10 x 26mm parallel shank compatible with?
The 10 x 26mm parallel shank with driving flat and length adjusting screw is a standard interface used on multi-spindle CNC boring machines, CNC boring centers, and panel processing centers equipped with compatible boring heads or chucks. The driving flat prevents the tool from rotating in the chuck under load, and the length adjusting screw allows precise depth positioning of the cutting head relative to the spindle face.
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