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Turbine disc


Aerospace turbines must withstand extreme temperatures and pressure differences. They are therefore made of advanced material, such as nickel based super alloys (e.g. Inconel 718, Waspalloy and Udimet 720)

Nickel based super alloys are excellent for their high temperature and stress resistance properties. It is important to apply best practice strategies as these materials are demanding to machine.

A complete package of standard tools together with uniquely productive solutions is readily available to deliver stable machining to any turbine disc feature.



Productive seal fin machining

Seal fins, air seals or labyrinth seals as they are also called, are key features for the functionality of gas turbine engines and are commonly found on turbine wheels. The fins work as a gas seal between rotating and stationary parts of the turbine.

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Non-linear tool path profiling

Non-linear tool path profiling uses the whole front edge line of the insert and continuously changes the contact point between insert and material​. Use this method for optimized chip control, even cutting wear, and to avoid built-in tensions.​


  • Improved productivity compared to a plunging or ramping operation​
  • Improved security and tool life​
  • Reduced number of passes
  • Green light production – secured, controlled and predictable insert wear​

CoroCut 1-2 Seal fin operation

CoroCut® 1-2 for seal fin grooving

CoroCut® 1-2 grooving tools are robust solutions delivering consistent chip control and process security.

Features and benefits

  • Proven geometries and grades provide secure, reliable machining with approved surface integrity and excellent surface finish​
  • Patented CoroCut® rail interface ensures mounting security​
  • CoroTurn® SL70 blades with precision coolant offer a versatile and stable solution with good chip control​
  • Periphery-ground carbide inserts provide edge sharpness and high tolerances
  • CBN grade for excellent surface finish, high speed machining and long time in cut

Inserts are available in width 2 mm (0.079 inch) and in width 1.5 mm (0.059 inch) for machining of even smaller seal fin grooves.

CoroCut 1-2 inserts for Seal fin grooving CoroCut 1-2 inserts for Seal fin grooving

1.5 mm (0.059 inch)

2 mm (0.079 inch)

The modular SL70 tooling system for seal fin turning

Due to tough material, accessibility and productivity, round inserts offer the best method and are used in both roughing and finishing.

  • Configurable assemblies with CoroTurn® SL70 blades and Coromant Capto® adaptors
  • Designed to fit typical profiling and pocketing features​
  • Oval coupling offers excellent stability and accessibility
  • Precision coolant as a standard feature
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Grade GC1105 – designed for challenging super alloy machining

GC1105 provides secure and reliable quality machining, even flank wear and a truly versatile solution for all application areas.

  • Reliability in intermediate stage machining through superior notch wear resistance in combination with good edge line toughness.
  • ​Guaranteed accurate high quality performance in last stage machining provided by our razor sharp, ground inserts and our state of the art thin coating, with excellent adhesion.

Read more about our super alloy solution – GC1105

Precision machining with GC1105

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Ceramic turning

Ceramic grades CC6220 and CC6230 are designed specifically for the challenges of new HRSA materials where whisker ceramics and SiAlONs fall short, capable of higher cutting speeds, contributing to reduced cost per component. For high metal removal rates in pocketing and profiling applications, choose grade CC6160.


Scallop milling

There are two powerful tools available for this challenging feature:

CoroMill® 316

CoroMill® Plura

Use exchangeable-head system with CoroMill® 316 for stable roughing of the scallop feature.

The CoroMill® Plura High Feed Side (HFS) milling concept, combined with a dedicated machining strategy is an efficient solution for increased tool life and to avoid burr formation.

Chamfering solutions and inserts are available for both product families.

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CoroCut® angled inserts

Perfectly formed for the difficult to access grooves, 90 degree angled inserts come in a variety of shapes all as standard inserts.

No need for special tools. Blanks even available for dedicated 90, 45 degree and T-profiles.​

Angled inserts for aerospace access


Drilling with low axial forces

The geometry design on CoroDrill® 846 solid carbide drills is optimized for HRSA and offers a high number of drilled holes with security and low axial cutting forces.

Read more about CoroDrill® R846

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