Machining Equipment

Polygonal clamping technology now also for driven tools

| Editor: Steffen Donath

Schunk Tribos polygonal toolholders with ER cone are specially designed for lathes and automatic rotary indexing machines. They allow shortest set-up times and precise presetting. They can directly clamp even the smallest shank diameter with utmost precision.
Schunk Tribos polygonal toolholders with ER cone are specially designed for lathes and automatic rotary indexing machines. They allow shortest set-up times and precise presetting. They can directly clamp even the smallest shank diameter with utmost precision. (Source: Schunk)

Schunk has developed special polygonal toolholders with ER cone for this purpose that can be combined with all commercially available mountings for ER collets and with driven tools in particular.

The clamping system uses the high versatility of the ER taper and combines this with the precision of polygonal clamping technology. Instead of the less precise collet chuck, the Tribos mounting is simply inserted into the provided toolholder and fastened using the ER clamping nut. The advantage: The tools can be preset in the Tribos mountings with an accuracy of 0.01 mm in length, and can be exchanged in the collet chuck in a few steps. In this way, the user benefits from fast set-up times on the one hand, and on the other hand, from considerably higher repeat accuracy in the clamping system in terms of run-out accuracy and projection length compared to ER collet chucks.

Tribos even clamps tools with the smallest shank diameters with high precision. The one-piece clamping system is resistant to dirt and has a high radial rigidity. Tribos polygonal toolholder with ER cone is available in two models: The particularly slim Tribos-Mini ER is an expert in the field of micro-machining and sets the benchmark for dealing with small shank diameters, delicate machining as well as in difficult to access areas. It is available in sizes ER 11 (clamping diameter 1 mm to 4 mm) and ER 16, ER 20, ER 25 and R 32 (clamping diameter 1 mm to 6 mm). Tribos-RM ER, on the other hand, specializes in precise volume machining in high speed ranges. Its tremendous clamping forces enable high machining performance with excellent concentricity, and thus boost productivity. The half-timbered structure and the high stability dampen vibrations and ensure that the tool has a long service life. Tribos-RM is available in sizes ER 20 (clamping diameter 3 mm to 8 mm) and ER 25 and ER 32 (clamping diameter 3 mm to 12 mm).

With its high run-out accuracy of < 0.01 mm and a balancing grade of G 2.5 at 25,000 RPM, the Tribos toolholders meet even the toughest requirements. Its rotationally symmetric design allows high speeds of rotation and adherence to complex dimensional and geometrical tolerances during delicate machining operations. Because the clamping system operates without any moving parts, it is not mechanically sensitive. Virtually maintenance-free and wear-resistant clamping is ensured. Endurance tests show no evidence of material fatigue and the run-out remains completely intact even after the clamping procedure has been repeated a thousand times.

Clamping stations with compact dimensions

Clamping stations with compact dimensions

20/12/2018 - The miniature clamping stations from the Schunk Vero-S NSL mini 100-25 series ensure high clamping forces in a compact design. The powerful 1-way, 2-way, and 4-way clamping stations are particularly designed for the requirements of modern small parts production. read...

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