Thermal Shrink Fit Tool Holder

By Bill Esler | Posted: 08/13/2013 9:31AM


Leitz Tooling provides a steady flow of new CNC cutting tool technology, along with supporting systems such as the ThermoGrip show here.

Leitz says its ThermoGrip shrink-fit tool-holding system, which uses heat in setting cutting tools, offers precision with its one-piece chuck design, minimizing tool run-out, deflection and balance issues common to collet and hydro tool-holding systems.

The shrink-fit approach heats the tool holder, which expands to accept the cutting tool. The bore in the holder is a bit smaller than the tool shank, and it expands when heated to accept the tool. On cooling, it grips far more strongly than mechanical collets, with thousands of pounds of force.

Heat shrink technology allows for highest-speed machining, while yielding optimized cut quality and significantly extended tool life. ThermoGrip is less expensive than conventional collet chucks, says Leitz.

Leitz’s U.S. operations are based in Grand Rapids, MI, where it recently moved its U.S. production facility from Jasper, IN.

Leitz offers apps and immense tooling knowledge base at


About the Author

Bill Esler, Woodworking Network, WMS

Bill Esler

Bill Esler, Editorial Director, Woodworking Network Bill is responsible for overall content at Woodworking Network magazine, and related newsletters. Bill also manages event programs for Woodworking Network Live conferences at the Woodworking Machinery & Supplies Expo in Toronto and Cabinets & Closets Expo. He developing audience engagement programs using custom digital printing, live lead-generating events, custom websites, and custom digital and print content. Read Bill Esler's woodworking blogs. He can be reached at or follow him on Google+.

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