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WID_TOOLINGSYSTEMS10_K008_K009.qxp:WIDIA 3:39 PM Page K8

KM4X™

Why Bending Load Capacity Is Important

When machining tough materials like titanium, cutting speeds are relatively low due to thermal effects on cutting tools. Over the years, machine tool builders SK (7/24 Taper) responded to this issue by improving stiffness and damping on spindles and machine structures. Spindles have been designed with abundant torque SK-F (7/24 Taper with face contact) at low rotational speeds. Nevertheless, the spindle connection has remained the weak link in the system. HSK The spindle connection must provide torque and bending capacity compatible with PSC the machine tool specifications and the requirements for higher productivity. It becomes obvious that in end-milling applications where the projection lengths are typically greater, the limiting factor is the bending capacity of the spindle interface. KM4X The lines on the chart to the right represent the load capacity of HSK, PSC, and KM4X. The shaded areas represent the typical requirements for heavy-duty applications in various machining processes. KM4X is the only system that can deliver the torque and bending required for achieving high-performance machining. Some systems may be able to transmit a considerable amounts of torque, but the cutting forces also generate bending moments that exceed the interface’s limits before torque limits are exceeded.

bending moment

Drilling Turning Deep Boring

Face Milling End Milling

Chart shows load-deflection comparison of steep taper with and without face contact — HSK and KM4X.

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00 0 1000

7/24 Taper — Size 50 with Face Contact 7/24 Taper — Size 50

2000 3000 4000 5000 6000

bending moment (Nm)

7/24 Taper — Size 60 HSK125A HSK100A KM4X100

150mm

F

deflection

KM4X125

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