Coolant Through Spindle

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Coolant Through Spindle

Requirement of CTS

Coolant through spindle is applied to achieve accurate finishing for deep machining process.

Through-Spindle Coolant (TSC) is an alternative to “flood coolant” system. The TSC conducts coolant through the cutting tool to cool the cutting edge, reduce friction, and remove chips. Coolant flows axially through a rotating union into the spindle and tool holder directly to the heat source. Compared to flood-coolant systems, TSC offers lower operating costs for tools and coolant, better control of tool overheating, faster feed rates, and higher productivity. To deliver coolant through the spindle, a coolant union or rotary union is required. 

During high-speed cutting, tools tend to wear and overheat which degrades the tool’s strength. To solve this, we require both cooling and lubrication. Flood-coolant systems spray coolant fluid onto the work piece near the cutting tool. But for many machining operations, such as milling or hole drilling, these systems are less effective at getting coolant fluid to the cutting edge. Without coolant, chips will back the cutting tool flutes and the cutting edge loses hardness due to overheating. This leads to excessive wear, short tool life, and poor surface finish.

Parts use in CTS Assembly

  • Coolant filtration unit
  • High pressure pump
  • Pressure relief valve
  • Pressure gauge
  • Flow switch
  • Rotary Joint(Dublin)
  • Pressure Discharging valve(Rotex)

CTS Arrangement

There are two types of arrangement in CTS system

First Way

Second way


Bag Filter

Flow Switch

Spindle Rotary Joint





Dump Pump

Bag Filter

coolant Tank


Flow switch

Spindle Rotary Joint

Advantages of CTS Over standard coolant system

  • Filtration is up to 0.025mm.
  • CTS Pressure is 21-150 bar.
  • Inserts life is more.
  • Deep machining is possible with higher finishing.

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