What Is the EXGRIP Five-Axis Tool Holder System?

The EXGRIP 5-Axis Tool Holder isn’t just a single tool, it’s a modular, high-precision clamping system engineered specifically for modern five-axis machining.

Built around the EXGRIP system architecture, it solves common challenges in complex machining, including:

• Lack of rigidity in long-reach applications
• Tool interference in deep cavities
• Difficulty maintaining micron-level precision

The result: greater stability, flexibility, and performance in demanding industries like aerospace, mold & die, and precision manufacturing.

Core Design Advantages

1. Modular System for Maximum Flexibility

EXGRIP uses a building-block approach, consisting of:

• Base holders (BBT, HSK, SK, CAT)
• Extensions and adapters (shrink-fit chucks, reduction sleeves, anti-vibration bars)
• Cutting tools (EXGRIP end mills)

Why it matters: One base holder can support multiple configurations, reducing inventory costs while increasing machine utilization.

2. High Precision & Rigidity

• Shrink-fit runout: ≤ 3 µm
• Assembly accuracy: ≤ 5 µm

Each component is manufactured as a monolithic structure, ensuring rigidity at every level. Precision-ground threaded interfaces maintain accuracy even in modular setups.

Added advantage: Anti-vibration extensions (including solid carbide options) significantly reduce chatter in long overhang machining.

3. Through-Spindle Coolant (Standard)

All EXGRIP components feature internal coolant channels, delivering coolant directly to the cutting edge.

• Improved heat control
• Efficient chip evacuation
• Extended tool life
• More stable machining

4. Optimized for Five-Axis Machining

Designed specifically for five-axis environments, EXGRIP includes:

• Slender extensions for deep cavity access
• Anti-interference geometries
• Mushroom head anti-vibration bars for vertical wall machining

These features allow better tool clearance and reduce collision risks during complex multi-axis movements.

Common Question: Does Modularity Reduce Accuracy?

Short answer: No.

While modular systems can introduce tolerance stack-up, EXGRIP maintains precision through:

1. High-Precision Threaded Connections

All interfaces use precision-ground threads and mating surfaces, ensuring radial runout remains within ≤ 5 µm.

2. Integrated Component Design

Each module (such as shrink-fit chucks) is manufactured as a single-piece structure, providing inherent rigidity and accuracy before assembly.

Key Benefits for Your Shop

1. Improved Surface Finish & Stability

Reduced vibration and high clamping precision lead to smoother cuts, better finishes, and tighter tolerances.

2. Expanded Machining Capability

Reach deeper cavities and machine complex geometries that are difficult or impossible with conventional holders.

3. Lower Tooling Costs

Reduce the need for dedicated holders while extending cutting tool life through improved stability and cooling.

4. Increased Productivity

Faster tool changes and stable cutting conditions allow more aggressive machining parameters and shorter cycle times.

How to Select and Use EXGRIP Tool Holders

Step 1: Identify Your Spindle Interface

Choose the correct base holder based on your machine:

• BT (BT40 / BT50)
• HSK (HSK63A / HSK100A)
• SK (SK40 / SK50)
• CAT (CAT40 / CAT50)

Step 2: Match the Application

• General machining: Standard shrink-fit chucks
• Deep cavities: Anti-vibration extensions (SW / SW-F series)
• Vertical walls: Mushroom head anti-vibration bars
• Material-specific cutting: Select appropriate EXGRIP end mill series

Step 3: Assemble the System

Example configuration:

Base Holder + Extension + Cutting Tool = Complete Tool Assembly

Step 4: Use a Heat Shrink Unit

Use a precision heat shrink machine for tool installation:

• Controlled heating prevents damage
• Ensures strong, uniform clamping force

Step 5: Inspect Runout

Verify assembly accuracy using a concentricity tester:

• Target runout: ≤ 3 µm

Real-World Applications

Deep Cavity Mold Machining

A mold shop machining a 200mm deep cavity eliminated chatter using anti-vibration extensions. Surface finish improved from Ra 3.2 µm to Ra 1.6 µm, with over 30% increase in tool life.

Aerospace Titanium Components

Using mushroom head anti-vibration bars eliminated tool interference in deep pockets, improving efficiency by 50%+ and removing the need for secondary processes.

Precision Electrode Machining

Shrink-fit accuracy ensured consistent results on small electrodes, while modular quick-change reduced setup time by 70%.

Final Thoughts

The EXGRIP Five-Axis Tool Holder System combines precision, flexibility, and performance into a single modular solution.

For shops pushing the limits of five-axis machining, it offers a clear advantage: better results, lower costs, and higher productivity.