Micro end mill for deep holes machining

Deep milling is a well-known constraint in chip removal machining. While this type of milling requires simple parameter adjustment with large tools, the situation is quite different for end mills with a cutting diameter of less than 1 mm.

Deep milling is a well-known constraint in chip removal machining. While this type of milling requires simple parameter adjustment with large tools, the situation is quite different for end mills with a cutting diameter of less than 1 mm.

New part designs are arriving in workshops as large depths need to be micro-machined using end mills with very small diameters.

Vibration problems, tool breakage and poor-quality machining can occur.

Louis Bélet has addressed the problem for its customers to offer them a reliable and economical solution that focuses on the three materials most commonly used in the med tech sector:

  • Titanium
  • Stainless steel
  • Cobalt chrome


Tests have been conducted on a “Torx” screw socket, which is a good example of real deep milling applications. The aim is to combine a long service life with a high chip removal rate.

Numerous prototype iterations – bringing together substrates, grinding geometries, coatings and cutting parameters – have resulted in an effective micro end mill in all three materials mentioned above.

A great deal of effort was also made on the joining area between the cutting part and the shank. A specific curvature was developed to maintain a high level of rigidity and to dampen vibrations, all the while providing sufficient clearance to avoid touching the milled walls and to release chips.

 

We supply diameters of Ø 0.20 to Ø 1.00 mm as standard

Example of cutting parameters tested with a Ref. 1450 Ø 0.5 mm end mill:

  Vc [m/min] N [tr/min] Fz [mm] F [mm/min]
Stainless steel 50 32'000 0.03 385
Titanium 50 32'000 0.03 385
Cobalt chrome 100 64'000 0.03 770


Lastly, let’s hear what customers who have already used these end mills have to say:

“No burrs”

“An impeccable surface finish”

“Phenomenally better”

Further info
Product groups:
Precision tools
    Milling


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Sinan Akyol

Louis Bélet SA

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