-English -EN Settings


Please select your country!


{{"ifind_go-back" | translate}}


Landing gear beam

​​​On the fuselage there are several structural components produced in titanium. The landing gear beam is one example of a component with thin floor sections.


Machining of structural aerospace components often involve challenging conditions, such as thin floors and walls, deep pockets and tight corners. We help you overcome these challenges with dedicated tools and methods.

Common challenges when machining structural parts:
  • Poor productivity
  • Vibration
  • Deflection of the tool and component
  • Short tool life
  • Chip jamming
  • Time consuming process

Stable high feed side milling strategy

Tough milling strategies with large tool engagement build up heat and cause excessive cutting forces which is challenging for the tool. A more stable strategy is to program for a large cutting depth (ap) and low cutting width (ae) combined with controlled maximum chip thickness to control the cutting forces. This allows for high feed machining with increased cutting speed and feed to achieve a high metal removal rate.

By utilizing a high feed side milling strategy, you will get a stable process and improved metal removal rate (Q).

This is how Q changes with different cutting widths (ae), cutting depths (ap), and chip thickness (hex) in the graph.

Metal removal rate
Cutting speed, vc
The smaller the radial engagement, the greater metal removal rate  Radial engagement

Read more about CoroMill® Plura HFS ISO S

Read more about CoroMill® 316

When machining thin floor sections, the cutting forces acting in the z direction will push the floor down. The forces easily forms deformation of the pocket.

The distribution of cutting forces depend on several factors:

  • Number of engaged teeth (z)
  • Radial depth of cut (ae)
  • Axial depth of cut (ap)
  • Helix angle

Common challenges:
  • Control of cutting forces
  • Deflection of floor
  • Distortion of part
  • Vibration
  • Surface finish
  • Fixturing
  • Residual stress from machining

To overcome the thin floor machining challenges, Sandvik Coromant has developed a dedicated machining strategy:

  • Spiral morph tool path for maximising part stability to reduce floor deflection
  • Optimised remaining stock to achieve finish cut with minimised axial cutting forces
  • Corners machined with a slicing method
  • Optimised ap/ae relationship to minimise cutting forces and component deflection


Dedicated titanium milling grades

S30T and S40T are available for a variety of CoroMill® cutters for face milling, shoulder milling, long-edge milling, plunging, high-feed milling, profiling and slot milling. Together these grades amount to a new level of reliable long lasting performance.


Grade S30T for speed and tool life

S30T has been developed with productive titanium milling in focus. It combines the properties of micrograin carbide and a wear resistant PVD coating. This enables very sharp cutting edges that resist fatigue and micro-chipping and result in cutting edges that are preserved for longer times in cut at higher cutting speeds. 


Grade S40T for difficult conditions

S40T is developed for difficult conditions combining high toughness cemented carbide with a thin CVD coating. The result is a grade that withstands vibration and other difficult cutting conditions for longer times in cut. The wear is predictable, making the cutting edge gradually duller without breaking.

Titanium milling grade S30T



{{ asset.Title }}

{{ asset.Description }}

​Finishing of 2D pocket

Perfect choice for finish machining of 2D pockets is the specialized solid carbide end mills.

These end mills developed for titanium enables you to machine deep pockets at high metal removal rates without vibration.

Other benefits are high accuracy and long tool life at high cutting data.


Corner milling-slicing

CoroMill Plura and slicing method is the ideal combination when machining corners in titanium components. Multiple passes successively remove material ensuring low radial immersion/engagement angle and low cutting forces.

Slicing corner


{{ asset.Title }}

{{ asset.Description }}


More videos

Rough face milling

Program a roll into cut in a clockwise motion (counter-clockwise will not solve the thick chip thickness problem). By rolling into cut, the chip thickness on exit is always zero, allowing for higher feed and longer tool life. A round insert cutter provides best productivity and tool life thanks to the lead angle and chip-thinning effect. CoroMill® 300 with S30T and S40T has through coolant and close pitch option, therefore optimized for titanium. Now available in insert sizes up to 20 mm (metric) or 1.0’’ (inch). 

Entrance into cut


{{ asset.Title }}

{{ asset.Description }}

More videos

Titanium milling grade S30T


2D profile milling

For this operation we can provide a total solution from roughing through to finishing. The best choice for roughing is CoroMill® 690 with specialized titanium grades S30T and S40T. The axial location of the inserts is built into the bottom of the insert to prevent movement and enable high metal removal rates with security. Its design makes it cut light and use minimum power. Each coolant hole is threaded to allow smaller diameter nozzles for high pressure coolant applications.

CoroMill 690

{{ asset.Title }}

{{ asset.Description }}

More videos:

Titanium milling grade S30T

CoroMill® 690 with new grade S30T

Component: Pylon
Operation: Roughing shoulder
Material: Ti-6Al-4V, 350 HB, forged, through hardened
Tool: Competitor / R690-10 Dc 80 int
Coolant: High pressure coolant



​Cutting speed, vc (m/min)
​Table feed Vf (mm/min)
​Feed/ tooth, fz
​Max chip thickness, hex mm
​Depth of cut, AP mm
​Radial depth of cut, ae mm
​Tool life (min)
​Tool life (components)

​Result: CoroMill 690 equipped with grade S30T makes 40% more parts than competitor.



For finishing we recommend the Sandvik Coromant long-edge finishing cutter, also known as the Dream cutter which gives a surface finish from 0.6 to 1.2 Ra where the steps on the surface are replaced by a slight wave.

The average flatness measures from 0.025 to 0.038 mm peak to valley.



High pressure coolant


Trouble-free production with targeted coolant​

The recommendation here is simple, always apply coolant when cutting titanium in large amounts and if possible at high pressure. Using high pressure coolant for milling in titanium will double the tool life compared to normal coolant pressure. The critical re-cutting of chips that damages the tool is prevented as welded chips are blown off.

  • Apply coolant through spindle and tool
  • Volume and pressure should be carefully planned in relation to the number and diameter of coolant holes and your operation
  • Nozzle sizes should be kept small to maximize pressure
  • Recommended pressure: 70 bars or more
  • Recommended volume: 50 litres/minute

High pressure coolant

{{ asset.Title }}

{{ asset.Description }}


Roughing of 2D pocket - Solution 1

For roughing of the 2D pocket apply the circular ramping method using low depths of cut but up to 1.0 mm feed per tooth together with the high feed cutter CoroMill 210 which provides a light and fast technique with excellent metal removal rate. It is suitable for all machine concepts and configurations.

The advantages with this circular ramping method are reduced number of tools (no drills needed), flexiblity - can produce a wide range of sizes. Alternative tools using the same programming technique are round insert cutters such as CoroMill 300 and CoroMill 200.

Roughing of 2D pocket -Solution 2

Opening up a 2D pocket with spiral morphing method using the CoroMill 390 long edge with 11 mm size insert and new titanium grade S30T provides excellent metal removal rates. Keep arc of engagement low when pocketing - produce a large entering hole (made by either drilling or helical ramping), roll into cut, then program with large corner radii to avoid vibration in corners.

Read more about CoroMill 390


Continous ramping


{{ asset.Title }}

{{ asset.Description }}


CoroMill 210

{{ asset.Title }}

{{ asset.Description }}


CoroMill 300

{{ asset.Title }}

{{ asset.Description }}


 Spiral morph

{{ asset.Title }}

{{ asset.Description }}

We use cookies to enhance the experience on our website. More about cookies.