Coolant meets the active zone – it sounds obvious, but in practice it’s anything but trivial. Anyone who works with indexable insert milling cutters or solid carbide end mills in tight cavities is familiar with the problem: chips build up, heat builds up, and tool life suffers. Coolcap® from Pokolm addresses this very issue and offers a well-designed mounting system that directs the coolant precisely where it’s needed.
13. October 2026
Longer service life, less wear
Effective Cooling with Coolcap®
In machining, heat dissipation determines everything: from tool life and surface quality to the cost-effectiveness of the entire process. Especially when using solid carbide end mills in grooves or deep cavities, conventional external cooling often fails for purely geometric reasons: the coolant does not reliably reach the cutting edge.
Coolcap® offers an efficient solution: The screw-on cap is mounted on specially designed holders and directs the coolant directly into the active zone via an integrated flow reservoir and a precise coolant guidance system.
Structure and Operating Principle
How Coolcap® Works
Coolcap® is an ideal solution for the effective cooling and lubrication of solid carbide end mills. The system essentially fulfills three structural functions: supplying coolant, concentrating it, and delivering it precisely where needed. Thanks to its intelligent design – featuring fine threads, a flow reservoir, and coolant guidance – Coolcap® directs the coolant directly to the cutting edge.
The Structure in Detail
Coolant Supply (Emulsion / Air / MQL): The coolant is fed directly into the system via the tool holder. Coolcap® is designed for all common coolants, whether emulsion, compressed air, or minimum quantity lubrication.
Fine thread: Coolcap® is mounted securely and reproducibly onto the tool holder via a precise fine thread. This ensures a stable, properly aligned connection without play.
Flow-rate reservoir: An integrated reservoir ensures that the flow rate is maintained evenly and constantly, regardless of the milling cutter’s diameter. The flow rate and outlet velocity are specifically matched to the milling cutters in use.
Coolant guidance: The heart of the system. The targeted guidance of the coolant ensures that it reaches the cutting edge directly, where heat and chips are generated.
Various Versions
Coolcap® for Emulsion, Compressed Air, or Minimum Quantity Lubrication (MQL)
Coolcap® is designed for various cooling media. Depending on the application requirements, a cap geometry for emulsion, compressed air, or minimum quantity lubrication (MQL) is used, making the system flexible for a variety of applications.
Coolcap® for emulsion/cooling water operates at higher pressures and is particularly suitable for heavy-duty machining, while Coolcap® for air or MMS optimally supports minimum quantity lubrication with adapted outlet cross-sections.
Benefits of Coolcap®
Why is using Coolcap® more beneficial than simple external cooling? The answer lies in the interplay between design and process control:
Extended tool life: Direct cooling of the active zone significantly reduces the thermal stress on the cutting edge. Less heat means less wear and, consequently, more cost-effective manufacturing processes with less frequent tool changes.
Increased process reliability: Coolcap® really shines, especially when using solid carbide tools. The targeted removal of chips from the machining zone prevents them from re-entering the cutting zone and protects both the tool and the workpiece surface.
Higher cutting parameters possible: When heat is under control, cutting speed can be increased. Coolcap® thus creates the conditions for more productive machining strategies for your company.
Clean cavities: Especially in deep, narrow cavities, the reliable removal of chips from the cutting zone is crucial. Coolcap® ensures that chips are removed and the machining zone remains clean.
Flexibility in cooling media: Whether emulsion cooling, compressed air, or MMS – with the right Coolcap® caps, the system can be tailored to the specific application and machine. This makes Coolcap® universally applicable.
Frequently Asked Questions (FAQ)
What cooling media does Coolcap® support?
What cutter diameters are supported by Coolcap®?
Is Coolcap® also worth it for conventional emulsion cooling?
How does Coolcap® affect production costs?
Would you like to optimize your manufacturing processes with Coolcap®?
Do you work with solid carbide end mills in deep cavities and want to extend tool life, increase cutting performance, or improve process reliability? Contact us: Our application engineers will provide you with personalized advice on Coolcap® and the right mounting system for your application.
Pokolm stands for practical machining solutions and high-performance milling tools.
Whether it’s single-piece production or a series production process – we’ll work with you to develop the right strategy, from tool selection to process optimization.