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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 the 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 commonly found on turbine wheels.

For productive seal fin machining, we recommend:

  • Scoop turning
  • Trochoidal turning​

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Trochoidal turning method

By choosing trochoidal turning over the more traditional ramping method, productivity can be doubled with improved security and tool life.​

Trochoidal turning uses the front edge line and continuously changes the contact point between insert and material.​


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Scoop turning

Patented strategy where the tool enters the feature material from both sides, delivering chip control and more accurate geometrical sizing.

  • Full chip control
  • Reduced cycle time
  • Good surface quality
  • Robust process

Grade GC1105 – Designed for the challenge of 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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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.

  • CoroTurn SL70 blades are designed to fit the typical profiling and pocketing features
  • The oval coupling offers excellent stability and accessibility
  • All radial and axial clearance requirements are covered in a compact program
  • Multi-task and vertical turning lathe requirements are met with Coromant Capto size C5, C6, and C8
  • Carbide RCMT and CoroCut grades have high-pressure coolant as standard
More videos:

CoroTurn SL

CoroTurn SL quick change

CoroTurn SL70

Scallop milling

Our exchangeable-head system with CoroMill® 316 is the economical tool for roughing the scallop feature. CoroMill Plura is an optimized tool to deliver to the finish process for the scallop machining.

Chamfering solutions are offered by both these product families. Inserts are also available in the same system.​

Read more about CoroMill 316

Read more about CoroMill Plura

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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 are even available for dedicated 90 degree, 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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