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  1. Home
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  3. Milling at full speed:TENDO E compact from SCHUNK

Milling at full speed:TENDO E compact from SCHUNK

09 May, 2017
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By Niraj M Wanikar, Chief Editor, CNCTimes.com, 2017-05-09 18:14:00

High-performance hydraulic expansion tool holder with simultaneous taper and face contact allow maximum performance on steep taper interfaces

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 the spindle is reduced. The consequences of this instability are serious: The system consisting of a 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 an 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 tool holder 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.

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