HIGH-END MULTI-PRESENCE
The Machinist|January 2022
Tools with threaded heads have significant advantages as they demonstrate impressive versatility, provide rational utilisation of cemented carbide and are user-friendly with simple head replacement.

Back in the early 2000s, the introduction of IS-CAR’s MULTI-MASTER system of rotating tools with interchangeable carbide heads played a significant role in the development of cutting tools. Tool assemblies with exchangeable heads were known long before ISCAR’s MULTI-MASTER. This was a product that changed the traditional view of the design concept of such systems.

Within the MULTI-MASTER product line, heads are secured by using a thread connection. Cemented carbide is a very hard and wear-resistant material and has lower impact strength when compared to highspeed steel. In a threaded carbide part, the thread is a source of stress concentrators that is crucial for tool functioning, especially under cyclic loading. Rotating tools with exchangeable carbide heads are reasonable in a relatively small diameter range, typically 6-25 mm (.25”-1.00”), which limits appropriate thread diameters and the height of a thread profile.

The above points make it problematic to use standard threads and strongly determine a special thread shape to comply with the specifications of the connection. Therefore, a thread connection as the head clamping element was highly questionable. Fortunately, the MULTI-MASTER, which is based on the threads of a specially designed profile (Fig.1), dismissed all doubts and its success led to a new look on common canons. Sometime after that, almost every tool manufacturer developed its system for rotating tools with exchangeable threaded carbide heads.

Tools with threaded heads have significant advantages as they demonstrate impressive versatility, provide rational utilisation of cemented carbide and are user-friendly with simple head replacement. It has been frequently asked what the secrets are of the MULTI-MASTER’s success and what are the features that ensure its popularity and longevity of the product.

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