Largest-yet polygon shank coupling

In 2008, ISO/DIS 26623 was created for ‘Polygon taper interface with flange contact surface’ to establish Coromant Capto as a recognised standard; this covered flange sizes 32 to 80 (C3 through to C8). In July 2013, the ISO committee agreed to add polygon shank size 100 (C10) to the existing standard.

Coromant Capto has been developed to cover three distinct application areas: integrated spindles for automatic tool change on turn-mill machines, vertical lathes and machining centres; quick change for manual tool change, thereby providing increased machine utilisation through shorter set-up times on turning centres, flat-bed lathes and vertical lathes; and modular assemblies designed to provide flexibility without loss of stability or accuracy on machining centres with HSK or steep-taper (ISO, MAS-BT, CAT-V) spindles.

Coromant Capto C10 has a spindle clamping force of 70kN and a flange diameter of 100mm, giving a bending stiffness that is greater than that of an HSK-A 100 or a steep-taper size 50 and on a par with an HSK-A 125. The benefits are that longer tools can be used with less risk of vibration, while maintaining the same spindle dimensions as for HSK-A 100. This will allow machines with a multi-functional capability to offer stable machining when using long tool assemblies.