7/27/2017 | 1 MINUTE READ

Stiffness Improvement at Interface Leads to Spindle Life Increase

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

How the tool was clamped affected the spindle’s life because of the way the user naturally attempted to overcome the stiffness limitation, says tooling company.

Share

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Connect at

Kennametal will be exhibiting new technology at IMTS 2020 in Chicago this September.

Plan to meet up with their team or get registered here!

What is the connection between the toolholder interface and the life of a machining center’s spindle? Offhand, it doesn’t seem like there should be a connection. How long the spindle performs effectively is different from the means by which it holds tooling.

But according to Bill Redman, global product manager for tooling systems with Kennametal, a Tier-One aircraft-industry manufacturer recently observed a significant increase in spindle life when it retrofitted milling spindles in its facility to the tooling company’s KM4X toolholder system. Certain machines had previously required spindle rebuilding every six months. That level of frequent spindle maintenance stopped.

Designed for quick change on heavy-duty spindles, the KM4X system uses four locking balls (as opposed to two on an earlier, smaller version of this system) to achieve fast, precise clamping of the toolholder into the spindle. Significantly, the four-ball lock also provides for high bending stiffness—and this is the reason for the spindle life increase, Mr. Redman says. Previously, to try to compensate for low bending stiffness in heavy cuts, the manufacturer was over-clamping its conical toolholders. The resulting bell-mouthing of the spindle led to the spindle failures. Thus, it wasn’t literally the toolholder interface affecting spindle life, but the user’s response to the limitations of that interface.

Applicable to non-rotating tools as well, the KM4X system can also provide high bending stiffness for tools such as long boring bars, Mr. Redman notes.

RELATED CONTENT

  • Tool Considerations for High Speed Cutting

    Fast CNC processing and high-pressure coolant contribute to removing metal at dramatic rates. But what should a shop know about cutting tools in high speed machining?

  • Drill And Bore With A Face Mill

    Cutting holes by interpolating a face milling cutter may be a better process choice for many rough and even finish boring operations. Software improvements and better cutter designs allow expanding use of the versatile face mill for hole making.

  • Rolling Threads Has Advantages

    With macros and canned cycles resident in the CNC on most contemporary turning centers, single point turning of OD threads can seem like almost a default process decision. However, for numerous applications, OD thread rolling has inherent advantages as an alternative to cutting threads.

Related Topics

Resources