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The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

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Trepanning Tool

This is a Trepanning Tool (also known as a hollow drill or core drill), a specialized cutting tool for deep hole machining that efficiently removes material by cutting an annular groove, leaving a solid core intact. It is ideal for roughing large-diameter deep holes, significantly reducing material waste and machining time.

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Description

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Core Function & Working Principle

Efficient Core Extraction: The annular cutting edge removes material from the hole wall, leaving a solid cylindrical core that can be either retained or ejected. Compared to solid drills, it reduces cutting volume by over 60%, dramatically improving machining efficiency.
Deep Hole Compatibility: Designed to work with BTA (Single Tube) or Ejector (Double Tube) deep hole systems, it uses high-pressure coolant delivered through internal channels to the cutting zone, with chips evacuated via the annulus between inner and outer tubes. Suitable for deep holes with depth-to-diameter ratios ≥ 50:1.
Modular Design: The cutting inserts and guide pads can be quickly replaced, reducing operational costs. The guide pads maintain contact with the hole wall to ensure excellent hole straightness.

Key Structure & Materials

Component	Function	Material/Features
Cutting Inserts	Primary cutting edges for annular material removal	Carbide (e.g., YG8, WC-Co) or coated carbide, suitable for carbon steel, stainless steel, titanium alloys, etc.
Guide Pads	Stabilize the tool and ensure hole straightness/cylindricity	Tungsten carbide inserts, with a 0.02–0.05 mm clearance from the hole wall to minimize tool deflection.
Tool Body	Mounts inserts and guide pads, integrates coolant channels	42CrMo alloy steel, heat-treated to HRC 30–35 for high rigidity and impact resistance.
Connection Interface	Connects to deep hole boring tubes or toolholders	Precision threaded or taper fit to ensure concentricity and torque transmission.

Technical Parameters (General Reference)

Parameter Category	Typical Specifications	Notes
Compatible Hole Diameter	φ80–φ500 mm	Larger diameters available on request.
Maximum Machining Depth	5000 mm	Depends on machine tool stroke and boring tube length.
Number of Cutting Inserts	4–8 pieces	Evenly distributed for stable cutting.
Number of Guide Pads	4–6 pieces	Staggered with inserts for optimal guidance.
Coolant Pressure	5–15 MPa	Ensures chips are suspended and evacuated smoothly.
Recommended Cutting Parameters	Cutting speed v = 40–80 m/min Feed rate f = 0.15–0.4 mm/rev	Adjust based on workpiece material; carbide inserts allow higher speeds.
Machining Accuracy	Hole Tolerance IT8–IT10 Surface Roughness Ra 3.2–6.3 μm	Subsequent finishing (e.g., honing) is required for higher precision.

Application Scenarios & Selection Guide

Typical Applications
- Roughing deep holes in large hydraulic cylinders and wind turbine main shafts
- Machining large-diameter holes in pressure vessels and nuclear power plant pipelines
- Core extraction for long cylindrical parts such as mold guide sleeves and gun barrels
Selection Criteria
- Hole Diameter & Depth: Choose the tool body size based on target hole diameter; for depths > 2000 mm, use with dedicated deep hole boring tubes.
- Workpiece Material: For high-hardness materials (HRC ≥ 45), select CBN or ceramic-coated inserts.
- Machine Tool Capacity: Ensure the machine’s torque, coolant pressure, and flow rate meet the tool’s requirements.

Advantages & Operational Notes

Core Advantages
- High material utilization, with the central core recoverable for reuse
- Lower cutting forces reduce machine load and tool wear
- 2–4 times more efficient than solid drills
Operational Tips
- Pre-drill a pilot hole (depth ≥ 2x hole diameter) to ensure initial tool alignment
- Use coolant with filtration accuracy ≤ 10 μm to prevent channel blockages
- Regularly inspect insert wear and guide pad clearance; replace worn components promptly

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Products

The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

Trepanning Tool

Description

marker

Core Function & Working Principle

Key Structure & Materials

Technical Parameters (General Reference)

Application Scenarios & Selection Guide

Advantages & Operational Notes

Contact us

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*Email

Phone / WhatsAPP / WeChat

* What I have to say.

Related Popular Products

Deep Hole Forming Tool

Four Axis CNC Deep Hole Gun Drilling Machine

Deep Hole Boring Tool

Modular Indexable Reamers (High-Precision Boring & Reaming Tools)

Milling Cutter Grinding Machine

Cemented Carbide Wear-Resistant Bushing

Centrifuge Equipment Wear-Resistant Plate

Composite Plate Substrat

Denitration Nozzle

Brazed Carbide Tip Gun Drills

Nickel-Based Corrosion-Resistant Alloys

Stellite Alloy Water Nozzle

T2125G T2125G1 T2136G T2136G1 Deep Hole Drilling and Boring Machine

Cemented Carbide Insert

Cemented Carbide Mushroom-Shaped Ball Tooth

Deep Hole Boring Tube

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