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WNT BT-FC toolholders enhance process security

28/06/2017

As spindles with face contact become more popular tooling suppliers have developed toolholding systems to maximise the additional performance benefits. WNT is at the forefront of this development with its BT-FC double contact system. By establishing contact with the spindle taper and face these holders ensure much greater process security, improved machining performance and reduced spindle wear.

One of the key benefits of the WNT BT-FC system is the increased rigidity that is generated through taper and face contact, with the additional face contact counteracting any lateral forces thereby greatly reducing axial deviation. For example, under heavy cutting conditions generating lateral forces of 5 kN a standard taper only holder would deviate by over 100 micron, under the same conditions a WNT BT-FC holder reduces that deviation to around 60 micron. Similarly, movement in the z-axis is eliminated, which can amount to as much as 0.03 mm at high spindle speeds when using conventional toolholding systems, affecting accuracy and repeatability.

The design of the WNT BT-FC toolholders also leads to extended spindle life and reduced vibration. In high speed machining environments spindle and toolholder wear is partly caused by oxidation of the spindle bore and toolholder taper, this oxidation is made worse due to the friction between toolholder and spindle. With the addition of face contact that friction through vibration is reduced, if not eliminated, which in turn reduces the possibility of oxidation occurring thereby extending service life of both the spindle and toolholder. The reduce vibration also enhances the surface quality of the part being machined.

To maximise the benefits of the WNT BT-FC toolholders they must be used with a BT-FC spindle, which many machine tool builders are now fitting as standard. The WNT BT-FC toolholders can still be used in standard BT spindles, but without the advantages of the recommended set-up. The WNT BT-FC toolholders are available in a wide range of systems including ER collet chuck, hydraulic chuck, shrink fit adapters, cylindrical shank and shell mil adapters. Depending on the style of holder chosen they can be specified with either BT30, BT40 or BT50 tapers.

“In the drive for improved productivity toolholding plays an important role alongside cutting tool and machine tool development. This is something that WNT has addressed over many years with products such as our hydraulic chucks, Shrink fit adapters and Centro P system. The BT-FC system is further evidence of our desire to ensure customers achieve the best performance from their machines and cutting tools,” Tony Pennington, UK & Ireland Managing Director.