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KM4X™ Features and Benefits

SK (7/24 Taper) SK-F (7/24 Taper with face contact) HSK PSC

KM4X

Figure 1

Drilling Turning Deep Boring

Face Milling End Milling

bending moment

Choosing What’s RightWith more materials that are tougher to machine and require considerably higher
When machining tough materials like titanium, cutting speeds are relativelycutting forces from the machine tool, choosing wisely on the spindle interface to
low due to thermal effects on cutting tools. In response, machine tool buildersmaximize cutting edge performance is the key to success.

have improved stiffness and damping on spindles and machine structures over The KM spindle connections greatly outperform the conventional 7/24 steep the years. Spindles have been designed with abundant torque at low rotational taper and its face taper contact derivative, HSK and PSC systems with their

speeds. Nevertheless, the spindle connection remains the weak link in the system. greater stiffness advantages to help minimize undesirable vibrations, gaining

The spindle connection must provide torque and bending capacity compatiblethe best possible productivity from the machine tool. The KM4X is the best
with the machine tool specifications and the requirements for higher productivity.large, heavy-duty spindle connection, where optimal rigidity is necessary. It has
It becomes obvious that in end-milling applications where the projection lengthssuperb balance between bending and torsion capabilities from the machine tool.

are typically greater, the limiting factor is bending capacity of the spindle interface.

0.40 0.35

0.30 As an example, an indexable 0.25 helical cutter with 250mm projection from spindle face and 0.20 80mm in diameter generates 4620 Nm of bending moment 150mm 0.15 and less than 900 Nm of torque. 0.10 F 0.05 0.00 Deflection

0100020003000400050006000Chart shows a comparison of Steep Taper with
bending moment (Nm)
and without face contact, HSK, and KM4X.
7/24 Taper — Size 50
7/24 Taper — Size 60HSK125AKM4X125
with Face Contact
7/24 Taper — Size 50HSK100AKM4X100

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