Micro cutters produce big results
How are the instruments used in the medical technology field different from conventional precision tools?
Medical technology requires special tools. On the one hand, they are characterized by the highest standards of precision and process reliability and, on the other hand, by very small structural dimensions (e.g. micro-cutting tools for endoscopes, connecting screws, tooth implants).
Which materials are used in the medical technology sector?
Primarily, the materials used are titanium, biocompatible ceramics (zirconia ceramic) and polymers.
Can medical technology tools be used on all conventional tool machines?
The tools can be deployed on both conventional and HSC milling machines as well as on turning milling centres. The highest priority is the stability of the machining process as any form of vibration can lead to premature tool breakage. The special thing about medical technology and in micro-cutting is the use of tool machines that are designed with special features. This increasingly includes automation and process documentation as well as spindles with high rotation speeds of up to 35,000 revolutions (often even more) for micro-cutting and correspondingly advanced control systems with what is known as "look-ahead" functions. This places great demands on external NC programming – for example, the process parameters have to be adjusted as a result of the sensitive interpolation movements.
What are the main requirements for the machining of medical technology components?
The entire process chain is characterized by simulation software, CAD/CAM compatibility, the actual processing (machining) and the measuring technology involved. This demands expertise covering the entire production process. Additional prerequisites are experience in the processing of high-strength materials and of plastics.
Which new challenges are presenting themselves in the development of micro cutters?
It is now even possible to mill hardened steel using the smallest tool diameters. These micro cutters are designed so that they can reliably endure even the greatest pressures despite their minute dimensions. As a result of its intensive R&D effort, LMT Fette is now in a position to offer micro cutters from a diameter of 0.2 mm. They are available in four different lengths and, depending on application, can be either uncoated or coated with TiAIN, TiSiN or diamond wear-protection layers.