Particularly for machines with BT dual contact interfaces, SCHUNK, the competence leader for clamping technology and gripping systems now offers the high-performance hydraulic expansion toolholder SCHUNK TENDO E compact in a version for simultaneous taper and face contact, which compensate for the weakness of steep taper interfaces. This allows the user to use the full performance potentials of the machine.

In the past, users who wanted to efficiently and economically machine with steep taper mountings, quickly met their tool’s limits. At an increasing speed, the spindle arbor expands and the contact surface between tool mounting and spindle is reduced. The consequences of this instability are serious: The system consisting of machine, toolholder and tool starts vibrating, the power transmission suffers, precision, and surface quality at the workpiece is lost, and tools wear out quickly. This weakness can be completely eliminated if machines with BT dual contact interface are combined with a SCHUNK TENDO E compact BT-DC hydraulic expansion toolholder. The taper and face contact system closes the gap between tool flange and end face of the machine spindle and a precise dual contact of the spindle at the taper and the end face of the machine spindle is given. At the same time, the system prevents the toolholder from drawing further back into the machine spindle, and stops motion along the Y-axis. Because of this radial rigidity and vibration strength of the whole system is maximized, and partly surpass the values of other standardized machine interfaces.

First-class quality and performance
TENDO E compact BT-DC with taper and face contact combines high clamping forces and an excellent vibration damping with an extraordinary bending and torsional strength. At an excellent machining quality and precision, the cutting parameters are increased, and in turn the machining time and costs are reduced. Comparable with a shock absorber, the world’s most powerful hydraulic expansion toolholder reliably absorbs vibrations, and provide for a quiet and exact cutting action. In heavy duty machining and drilling and reaming operations, the user benefits from an extremely high surface quality. Particularly the geometric three-dimensional precision of form and die are substantially improved. Moreover, the high run-out and repeat accuracy at the spindle interface ensures for long tool life, maximum protection of the spindle and for high process safety.

Up to 60% higher torques
At a permanent run-out accuracy of < 0.003 mm at an unclamped length of 2.5 x D, and a balancing quality of G 2.5 at 25.000 rpm, the SCHUNK TENDO E compact BT-DC with simultaneous taper and face contact seamlessly fits into the proven hydraulic expansion technology program from SCHUNK. Its clamping forces are about 20% higher than the ones of conventional hydraulic expansion toolholders. Compared with conventional hydraulic expansion toolholders, the TENDO E compact transmits up to 60% higher torques. For fast tool change, all that is needed, is an Allen key. All popular shank types, also Weldon or Whistle Notch shanks can be clamped. By using intermediate sleeves the clamping diameter can be flexibly reduced. Initially, the SCHUNK TENDO E compact with simultaneous taper and face contact interface will be available on a basis of BT 30 (Ø 20 mm). At the beginning of 2017, BT 30 (Ø 12 mm), and BT 40 (ø 12 mm, ø 20 mm) will follow.

The SCHUNK high-performance hydraulic expansion toolholder TENDO Aviation was developed especially for demanding applications with a requirement for mechanical tool locking, for example in the field of aviation and aeronautics. For tools with a standard Weldon shank, the integrated pull-out protection ensures form-fit clamping of the oriented tool and prevents micro creep movements. Due to the large demand, SCHUNK is expanding the product line in time for EMO.

Benefits of two clamping systems
SCHUNK TENDO Aviation combines the strengths of hydraulic expansion technology with those of Weldon mountings: the impressive features include permanently high run-out accuracy, perfect vibration damping and quick tool changes with the use of an Allen key. Even jobs with demanding tolerances can be maintained with high precision. The potentials of the tool and the machine can also be fully utilized. SCHUNK TENDO Aviation enables a maximum torque transfer with continuously high precision and process stability. It offers considerable advantages over traditional Weldon mountings and heat shrink toolholders whose run-out precision diminishes over time. It prolongs the life of the tool cutting edge, and increases the tool life travel all while producing brilliant surfaces. In addition, the even load profile increases the life of the spindle and spindle bearing.

Especially efficient
Like all SCHUNK hydraulic expansion toolholders, SCHUNK TENDO Aviation needs no additional peripheral equipment, which can be expensive. The clamping diameter is flexible and can be reduced by means of intermediate sleeves, which allows the same toolholder to be used for different shank diameters. Unlike ER collet chucks or heat shrink mountings, the affordable high-end toolholder is resistant to dirt, and features a low-maintenance design. To increase the life of the toolholder while ensuring maximum process stability in sensitive processes, the precision toolholder can be inspected by SCHUNK Service in performance checks and optimized, if necessary. It can be used for machining of turbine blades or fuselage frames in the aviation industry, turbochargers rotors and steering wheels in the automotive industry and titanium- or nickel-based alloys in metal processing. The precision toolholder, which is manufactured exclusively at the SCHUNK headquarters in Lauffen, Germany, is available for the interfaces HSK-A63, HSK-A100, SK-40, BT-40 (ø 20 mm and 32 mm) as well as SK-50 and BT-50 (ø 20 mm; in addition, ø 32 mm is planned).